{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-63075", "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "state": "PUBLISHED", "assignerShortName": "openssl", "dateReserved": "2026-07-15T13:10:26.188Z", "datePublished": "2026-08-25T13:00:04.752Z", "dateUpdated": "2026-08-25T14:36:51.928Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "OpenSSL", "vendor": "OpenSSL", "versions": [{"lessThan": "4.0.2", "status": "affected", "version": "4.0.0", "versionType": "semver"}, {"lessThan": "3.6.4", "status": "affected", "version": "3.6.0", "versionType": "semver"}, {"lessThan": "3.5.8", "status": "affected", "version": "3.5.0", "versionType": "semver"}, {"lessThan": "3.4.7", "status": "affected", "version": "3.4.0", "versionType": "semver"}]}], "credits": [{"lang": "en", "type": "reporter", "value": "Opal Wright (Trail of Bits)"}, {"lang": "en", "type": "remediation developer", "value": "Neil Horman"}], "datePublic": "2026-08-25T11:36:16.000Z", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "Issue summary: When OpenSSL processes QUIC traffic from a peer that repeatedly<br>sends ack-eliciting packets while not acknowledging ACK-only responses, the<br>QUIC stack can retain ACK-only packet metadata for the lifetime of the<br>connection.<br><br>Impact summary: A remote peer that can complete a QUIC handshake can<br>cause connection-scoped memory growth which may lead to Denial of Service<br>through memory exhaustion, especially with sustained traffic or many concurrent<br>QUIC connections.<br><br>CWE: CWE-770: Allocation of Resources Without Limits or Throttling<br><br>Description: When the OpenSSL QUIC stack sends an ACK-only packet,<br>there is no requirement by the QUIC protocol that the peer will acknowledge<br>that ACK-only packet (i.e. it is itself not ack-eliciting). However, the OpenSSL<br>implementation stores the metadata about the ACK frames regardless.<br>In and of itself that's ok, but if a malicious peer establishes a connection, and<br>then drives the connection such that ACK-only packets are forced from the <br>OpenSSL implementation peer (i.e., by sending numerous PING frames),<br>and then withholding any subsequent acks for ack-eliciting data, like<br>legitimate data, said malicious peer can force inappropriate memory growth<br>on the OpenSSL peer, potentially leading to a Denial of Service.<br><br>The fix is to ensure that we account for the transmission of the ACK-only<br>packet in the packet histories high and low watermark without actually storing<br>the ACK-only packet metadata itself.<br><br>FIPS impact: no<br>The OpenSSL FIPS module is not affected as the QUIC code is<br>outside the FIPS module boundary."}], "value": "Issue summary: When OpenSSL processes QUIC traffic from a peer that repeatedly\nsends ack-eliciting packets while not acknowledging ACK-only responses, the\nQUIC stack can retain ACK-only packet metadata for the lifetime of the\nconnection.\n\nImpact summary: A remote peer that can complete a QUIC handshake can\ncause connection-scoped memory growth which may lead to Denial of Service\nthrough memory exhaustion, especially with sustained traffic or many concurrent\nQUIC connections.\n\nCWE: CWE-770: Allocation of Resources Without Limits or Throttling\n\nDescription: When the OpenSSL QUIC stack sends an ACK-only packet,\nthere is no requirement by the QUIC protocol that the peer will acknowledge\nthat ACK-only packet (i.e. it is itself not ack-eliciting). 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{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2026-63075", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-08-25T14:36:48.832724Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-25T14:36:45.738Z"}}], "cna": {"title": "QUIC ACK-only Packet Retention Can Cause Memory Exhaustion", "source": {"discovery": "UNKNOWN"}, "credits": [{"lang": "en", "type": "reporter", "value": "Opal Wright (Trail of Bits)"}, {"lang": "en", "type": "remediation developer", "value": "Neil Horman"}], "metrics": [{"other": {"type": "https://openssl-library.org/policies/general/security-policy/", "content": {"text": "Low"}}, "format": "other"}], "affected": [{"vendor": "OpenSSL", "product": "OpenSSL", "versions": [{"status": "affected", "version": "4.0.0", "lessThan": "4.0.2", "versionType": "semver"}, {"status": "affected", "version": "3.6.0", "lessThan": "3.6.4", "versionType": "semver"}, {"status": "affected", "version": "3.5.0", "lessThan": "3.5.8", "versionType": "semver"}, {"status": "affected", "version": "3.4.0", "lessThan": "3.4.7", "versionType": "semver"}], "defaultStatus": "unaffected"}], "datePublic": "2026-08-25T11:36:16.000Z", "references": [{"url": "https://openssl-library.org/news/secadv/20260825.txt", "name": "OpenSSL Advisory", "tags": ["vendor-advisory"]}, {"url": "https://github.com/openssl/openssl/commit/7308946576b12e64b8be53bcf0a120354b2b42bc", "name": "4.0.2 git commit", "tags": ["patch"]}, {"url": "https://github.com/openssl/openssl/commit/bf84721c2548351176e367e6de505792f0118dc6", "name": "3.6.4 git commit", "tags": ["patch"]}, {"url": "https://github.com/openssl/openssl/commit/7c98d79738549df92868e7dd9be4bbf061eed709", "name": "3.5.8 git commit", "tags": ["patch"]}, {"url": "https://github.com/openssl/openssl/commit/c902e5f16d6a9e130e96d3ca6d8f64d71652e393", "name": "3.4.7 git commit", "tags": ["patch"]}], "x_generator": {"engine": "Vulnogram 0.2.0"}, "descriptions": [{"lang": "en", "value": "Issue summary: When OpenSSL processes QUIC traffic from a peer that repeatedly\nsends ack-eliciting packets while not acknowledging ACK-only responses, the\nQUIC stack can retain ACK-only packet metadata for the lifetime of the\nconnection.\n\nImpact summary: A remote peer that can complete a QUIC handshake can\ncause connection-scoped memory growth which may lead to Denial of Service\nthrough memory exhaustion, especially with sustained traffic or many concurrent\nQUIC connections.\n\nCWE: CWE-770: Allocation of Resources Without Limits or Throttling\n\nDescription: When the OpenSSL QUIC stack sends an ACK-only packet,\nthere is no requirement by the QUIC protocol that the peer will acknowledge\nthat ACK-only packet (i.e. it is itself not ack-eliciting). However, the OpenSSL\nimplementation stores the metadata about the ACK frames regardless.\nIn and of itself that's ok, but if a malicious peer establishes a connection, and\nthen drives the connection such that ACK-only packets are forced from the \nOpenSSL implementation peer (i.e., by sending numerous PING frames),\nand then withholding any subsequent acks for ack-eliciting data, like\nlegitimate data, said malicious peer can force inappropriate memory growth\non the OpenSSL peer, potentially leading to a Denial of Service.\n\nThe fix is to ensure that we account for the transmission of the ACK-only\npacket in the packet histories high and low watermark without actually storing\nthe ACK-only packet metadata itself.\n\nFIPS impact: no\nThe OpenSSL FIPS module is not affected as the QUIC code is\noutside the FIPS module boundary.", "supportingMedia": [{"type": "text/html", "value": "Issue summary: When OpenSSL processes QUIC traffic from a peer that repeatedly<br>sends ack-eliciting packets while not acknowledging ACK-only responses, the<br>QUIC stack can retain ACK-only packet metadata for the lifetime of the<br>connection.<br><br>Impact summary: A remote peer that can complete a QUIC handshake can<br>cause connection-scoped memory growth which may lead to Denial of Service<br>through memory exhaustion, especially with sustained traffic or many concurrent<br>QUIC connections.<br><br>CWE: CWE-770: Allocation of Resources Without Limits or Throttling<br><br>Description: When the OpenSSL QUIC stack sends an ACK-only packet,<br>there is no requirement by the QUIC protocol that the peer will acknowledge<br>that ACK-only packet (i.e. it is itself not ack-eliciting). However, the OpenSSL<br>implementation stores the metadata about the ACK frames regardless.<br>In and of itself that's ok, but if a malicious peer establishes a connection, and<br>then drives the connection such that ACK-only packets are forced from the <br>OpenSSL implementation peer (i.e., by sending numerous PING frames),<br>and then withholding any subsequent acks for ack-eliciting data, like<br>legitimate data, said malicious peer can force inappropriate memory growth<br>on the OpenSSL peer, potentially leading to a Denial of Service.<br><br>The fix is to ensure that we account for the transmission of the ACK-only<br>packet in the packet histories high and low watermark without actually storing<br>the ACK-only packet metadata itself.<br><br>FIPS impact: no<br>The OpenSSL FIPS module is not affected as the QUIC code is<br>outside the FIPS module boundary.", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-770", "description": "CWE-770 Allocation of Resources Without Limits or Throttling"}]}], "providerMetadata": {"orgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "shortName": "openssl", "dateUpdated": "2026-08-25T13:00:04.752Z"}}}, "cveMetadata": {"cveId": "CVE-2026-63075", "state": "PUBLISHED", "dateUpdated": "2026-08-25T14:36:51.928Z", "dateReserved": "2026-07-15T13:10:26.188Z", "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "datePublished": "2026-08-25T13:00:04.752Z", "assignerShortName": "openssl"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "OpenSSL", "vendor": "OpenSSL", "versions": [{"lessThan": "4.0.2", "status": "affected", "version": "4.0.0", "versionType": "semver"}, {"lessThan": "3.6.4", "status": "affected", "version": "3.6.0", "versionType": "semver"}, {"lessThan": "3.5.8", "status": "affected", "version": "3.5.0", "versionType": "semver"}, {"lessThan": "3.4.7", "status": "affected", "version": "3.4.0", "versionType": "semver"}]}], "source": "openssl-security@openssl.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Issue summary: When OpenSSL processes QUIC traffic from a peer that repeatedly\nsends ack-eliciting packets while not acknowledging ACK-only responses, the\nQUIC stack can retain ACK-only packet metadata for the lifetime of the\nconnection.\n\nImpact summary: A remote peer that can complete a QUIC handshake can\ncause connection-scoped memory growth which may lead to Denial of Service\nthrough memory exhaustion, especially with sustained traffic or many concurrent\nQUIC connections.\n\nCWE: CWE-770: Allocation of Resources Without Limits or Throttling\n\nDescription: When the OpenSSL QUIC stack sends an ACK-only packet,\nthere is no requirement by the QUIC protocol that the peer will acknowledge\nthat ACK-only packet (i.e. it is itself not ack-eliciting). However, the OpenSSL\nimplementation stores the metadata about the ACK frames regardless.\nIn and of itself that's ok, but if a malicious peer establishes a connection, and\nthen drives the connection such that ACK-only packets are forced from the \nOpenSSL implementation peer (i.e., by sending numerous PING frames),\nand then withholding any subsequent acks for ack-eliciting data, like\nlegitimate data, said malicious peer can force inappropriate memory growth\non the OpenSSL peer, potentially leading to a Denial of Service.\n\nThe fix is to ensure that we account for the transmission of the ACK-only\npacket in the packet histories high and low watermark without actually storing\nthe ACK-only packet metadata itself.\n\nFIPS impact: no\nThe OpenSSL FIPS module is not affected as the QUIC code is\noutside the FIPS module boundary."}], "id": "CVE-2026-63075", "lastModified": "2026-08-28T19:46:29.323", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-63075", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-25T14:36:48.832724Z", "version": "2.0.3"}}]}, "published": "2026-08-25T13:19:26.413", "references": [{"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/7308946576b12e64b8be53bcf0a120354b2b42bc"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/7c98d79738549df92868e7dd9be4bbf061eed709"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/bf84721c2548351176e367e6de505792f0118dc6"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/c902e5f16d6a9e130e96d3ca6d8f64d71652e393"}, {"source": "openssl-security@openssl.org", "url": "https://openssl-library.org/news/secadv/20260825.txt"}], "sourceIdentifier": "openssl-security@openssl.org", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}], "source": "openssl-security@openssl.org", "type": "Secondary"}]}

{"bugzilla": {"description": "openssl: QUIC ACK-only packet retention can cause memory exhaustion", "id": "2517570", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2517570"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-770", "details": ["A flaw was found in OpenSSL. The QUIC protocol implementation retains metadata for ACK-only packets for the lifetime of a connection, leading to excessive memory consumption. This allows a peer to repeatedly send ack-eliciting packets while not acknowledging ACK-only responses to cause memory exhaustion, eventually resulting in a denial of service."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2026-63075", "package_state": [{"cpe": "cpe:/a:redhat:rhdh:1", "fix_state": "Fix deferred", "package_name": "rhdh/rhdh-hub-rhel9", "product_name": "Red Hat Developer Hub"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "edk2", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "openssl", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "shim", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "shim-unsigned-aarch64", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "shim-unsigned-x64", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "openssl", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "openssl", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "ovmf", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "shim-signed", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "compat-openssl10", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "edk2", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "mingw-openssl", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "openssl", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "shim", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "shim-unsigned-aarch64", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "shim-unsigned-x64", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "compat-openssl11", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "edk2", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "openssl", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "shim", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "shim-unsigned-aarch64", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "shim-unsigned-x64", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "openssl", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "openssl3", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "unbound", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Not affected", "package_name": "openvox-agent", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Not affected", "package_name": "puppet-agent", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:rhel_satellite_client:6::el7", "fix_state": "Not affected", "package_name": "openvox-agent", "product_name": "Red Hat Satellite Client"}, {"cpe": "cpe:/a:redhat:rhel_satellite_client:6::el7", "fix_state": "Not affected", "package_name": "puppet-agent", "product_name": "Red Hat Satellite Client"}], "public_date": "2026-08-25T16:05:51Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-63075\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-63075\nhttps://openssl-library.org/news/secadv/20260825.txt"], "statement": "To exploit this issue, an attacker needs to complete a QUIC handshake and repeatedly send ack-eliciting packets while not acknowledging ACK-only responses. This causes the QUIC implementation to retain metadata for ACK-only responses for the lifetime of a connection, leading to excessive memory consumption, eventually resulting in a denial of service with no other security impact. For these reasons, this vulnerability has been rated with a low severity.", "threat_severity": "Low"}