{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-57941", "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "state": "PUBLISHED", "assignerShortName": "apache", "dateReserved": "2026-06-26T13:34:41.733Z", "datePublished": "2026-10-01T16:06:53.028Z", "dateUpdated": "2026-10-01T20:09:25.619Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "shortName": "apache", "dateUpdated": "2026-10-01T16:06:53.028Z"}, "title": "Apache HTTP Server: mod_http2 use-after-free / wild write via shared session->bbtmp re-entrancy", "problemTypes": [{"descriptions": [{"description": "CWE-416 Use After Free", "lang": "en", "cweId": "CWE-416", "type": "CWE"}]}], "source": {"discovery": "UNKNOWN"}, "affected": [{"vendor": "Apache Software Foundation", "product": "Apache HTTP Server", "versions": [{"status": "affected", "version": "2.4.0", "lessThanOrEqual": "2.4.68", "versionType": "semver"}], "defaultStatus": "unaffected"}], "descriptions": [{"value": "Use After Free vulnerability in Apache HTTP Server's mod_http2\u00a0via shared session->bbtmp re-entrancy\n\n\n\nThis issue affects Apache HTTP Server: from 2.4.0 through 2.4.68.", "lang": "en", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>Use After Free vulnerability in Apache HTTP Server's mod_http2&nbsp;<span>via shared session-&gt;bbtmp re-entrancy</span></p><p>This issue affects Apache HTTP Server: from 2.4.0 through 2.4.68.</p><p><br></p>"}]}], "references": [{"url": "https://httpd.apache.org/security/vulnerabilities_24.html", "tags": ["vendor-advisory"]}], "metrics": [{"other": {"type": "Textual description of severity", "content": {"text": "moderate"}}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "timeline": [{"time": "2026-06-15T12:00:00.000Z", "lang": "en", "value": "reported"}, {"time": "2026-10-01T12:00:00.000Z", "lang": "en", "value": "fixed in 2.4.x by r1938665"}, {"time": "2026-10-01T12:00:00.000Z", "lang": "eng", "value": "2.4.69 released"}], "credits": [{"lang": "en", "value": "Lucian Nitescu", "type": "finder"}, {"lang": "en", "value": "Simon Kappel", "type": "finder"}, {"lang": "en", "value": "Gianluca Danesin, Altervista", "type": "finder"}], "x_generator": {"engine": "Vulnogram 0.2.0"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-10-01T19:06:52.698741Z", "id": "CVE-2026-57941", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-01T19:07:14.748Z"}}, {"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/10/01/19"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-10-01T20:09:25.619Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/10/01/19"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-10-01T20:09:25.619Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2026-57941", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-01T19:06:52.698741Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-01T19:07:08.192Z"}}], "cna": {"title": "Apache HTTP Server: mod_http2 use-after-free / wild write via shared session->bbtmp re-entrancy", "source": {"discovery": "UNKNOWN"}, "credits": [{"lang": "en", "type": "finder", "value": "Lucian Nitescu"}, {"lang": "en", "type": "finder", "value": "Simon Kappel"}, {"lang": "en", "type": "finder", "value": "Gianluca Danesin, Altervista"}], "metrics": [{"other": {"type": "Textual description of severity", "content": {"text": "moderate"}}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"vendor": "Apache Software Foundation", "product": "Apache HTTP Server", "versions": [{"status": "affected", "version": "2.4.0", "versionType": "semver", "lessThanOrEqual": "2.4.68"}], "defaultStatus": "unaffected"}], "timeline": [{"lang": "en", "time": "2026-06-15T12:00:00.000Z", "value": "reported"}, {"lang": "en", "time": "2026-10-01T12:00:00.000Z", "value": "fixed in 2.4.x by r1938665"}, {"lang": "eng", "time": "2026-10-01T12:00:00.000Z", "value": "2.4.69 released"}], "references": [{"url": "https://httpd.apache.org/security/vulnerabilities_24.html", "tags": ["vendor-advisory"]}], "x_generator": {"engine": "Vulnogram 0.2.0"}, "descriptions": [{"lang": "en", "value": "Use After Free vulnerability in Apache HTTP Server's mod_http2\u00a0via shared session->bbtmp re-entrancy\n\n\n\nThis issue affects Apache HTTP Server: from 2.4.0 through 2.4.68.", "supportingMedia": [{"type": "text/html", "value": "<p>Use After Free vulnerability in Apache HTTP Server's mod_http2&nbsp;<span>via shared session-&gt;bbtmp re-entrancy</span></p><p>This issue affects Apache HTTP Server: from 2.4.0 through 2.4.68.</p><p><br></p>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free"}]}], "providerMetadata": {"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "shortName": "apache", "dateUpdated": "2026-10-01T16:06:53.028Z"}}}, "cveMetadata": {"cveId": "CVE-2026-57941", "state": "PUBLISHED", "dateUpdated": "2026-10-01T20:09:25.619Z", "dateReserved": "2026-06-26T13:34:41.733Z", "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "datePublished": "2026-10-01T16:06:53.028Z", "assignerShortName": "apache"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Apache HTTP Server", "vendor": "Apache Software Foundation", "versions": [{"lessThanOrEqual": "2.4.68", "status": "affected", "version": "2.4.0", "versionType": "semver"}]}], "source": "security@apache.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*", "matchCriteriaId": "2571DF83-8980-4BEF-9EBE-AB2D9E6C03C7", "versionEndExcluding": "2.4.69", "versionStartIncluding": "2.4.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Use After Free vulnerability in Apache HTTP Server's mod_http2\u00a0via shared session->bbtmp re-entrancy\n\n\n\nThis issue affects Apache HTTP Server: from 2.4.0 through 2.4.68."}], "id": "CVE-2026-57941", "lastModified": "2026-10-05T13:29:16.297", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-57941", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-01T19:06:52.698741Z", "version": "2.0.3"}}]}, "published": "2026-10-01T17:17:27.457", "references": [{"source": "security@apache.org", "tags": ["Vendor Advisory"], "url": "https://httpd.apache.org/security/vulnerabilities_24.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "http://www.openwall.com/lists/oss-security/2026/10/01/19"}], "sourceIdentifier": "security@apache.org", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "security@apache.org", "type": "Secondary"}]}

{"bugzilla": {"description": "httpd: Apache HTTP Server: mod_http2 use-after-free / wild write via shared session->bbtmp re-entrancy", "id": "2544864", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2544864"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["Use After Free vulnerability in Apache HTTP Server's mod_http2\u00a0via shared session->bbtmp re-entrancy\nThis issue affects Apache HTTP Server: from 2.4.0 through 2.4.68.", "A flaw was found in the mod_http2 module of Apache HTTP Server. A remote, unauthenticated attacker could exploit a use-after-free condition\u2014where memory is accessed after being released\u2014through re-entrant processing of shared session buffers. This flaw can allow an attacker to potentially execute arbitrary code or crash the server, resulting in a Denial of Service (DoS)."], "mitigation": {"lang": "en:us", "value": "Disable mod_http2 until a fixed package is installed. In /etc/httpd/conf.modules.d/10-h2.conf, comment out the module and restart the service:\n#LoadModule http2_module modules/mod_http2.so\n$ systemctl restart httpd"}, "name": "CVE-2026-57941", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "httpd", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "mod_http2", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Affected", "package_name": "httpd", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "httpd", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "httpd:2.4/httpd", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "httpd:2.4/mod_http2", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "httpd", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "mod_http2", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "httpd", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:jboss_core_services:1", "fix_state": "Under investigation", "package_name": "jbcs-httpd24-httpd", "product_name": "Red Hat JBoss Core Services"}, {"cpe": "cpe:/a:redhat:jboss_core_services:1", "fix_state": "Affected", "package_name": "jbcs-httpd24-mod_http2", "product_name": "Red Hat JBoss Core Services"}], "public_date": "2026-10-01T16:06:53Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-57941\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-57941\nhttp://www.openwall.com/lists/oss-security/2026/10/01/19\nhttps://httpd.apache.org/security/vulnerabilities_24.html"], "statement": "A use-after-free flaw was found in mod_http2, the HTTP/2 module for the Apache HTTP Server. A remote attacker with no privileges can trigger re-entrant use of a shared per-session buffer (session->bbtmp) while the server is handling HTTP/2 traffic. That interleaving is not a single reliable request, and the demonstrated effect is a crash of the httpd worker, which is a denial of service. A further memory-corruption outcome has not been shown.", "threat_severity": "Moderate"}