CVE-2026-3805 - Vulnerability Details - OpenCVE

When doing a second SMB request to the same host again, curl would wrongly use a data pointer pointing into already freed memory.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation poc

Automatable yes

Technical Impact partial

No data.

No data.

No data.

References

Link	Providers
http://www.openwall.com/lists/oss-security/2026/03/11/4
https://curl.se/docs/CVE-2026-3805.html
https://curl.se/docs/CVE-2026-3805.json
https://hackerone.com/reports/3591944

History

Wed, 11 Mar 2026 16:15:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-416
Metrics		cvssV3_1 `{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}` ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Wed, 11 Mar 2026 11:30:00 +0000

Type	Values Removed	Values Added
References		http://www.openwall.com/lists/oss-security/2026/03/11/4

Wed, 11 Mar 2026 10:30:00 +0000

Type	Values Removed	Values Added
Description		When doing a second SMB request to the same host again, curl would wrongly use a data pointer pointing into already freed memory.
Title		use after free in SMB connection reuse
References		https://curl.se/docs/CVE-2026-3805.html https://curl.se/docs/CVE-2026-3805.json https://hackerone.com/reports/3591944

MITRE

Status: PUBLISHED

Assigner: curl

Published: 2026-03-11T10:09:37.729Z

Updated: 2026-03-11T15:45:38.820Z

Reserved: 2026-03-08T16:07:39.817Z

Link: CVE-2026-3805

Vulnrichment

Updated: 2026-03-11T10:16:34.391Z

NVD

Status : Awaiting Analysis

Published: 2026-03-11T11:16:00.967

Modified: 2026-03-11T16:16:47.143

Link: CVE-2026-3805

Redhat

No data.

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-3805", "assignerOrgId": "2499f714-1537-4658-8207-48ae4bb9eae9", "state": "PUBLISHED", "assignerShortName": "curl", "dateReserved": "2026-03-08T16:07:39.817Z", "datePublished": "2026-03-11T10:09:37.729Z", "dateUpdated": "2026-03-11T15:45:38.820Z"}, "containers": {"cna": {"title": "use after free in SMB connection reuse", "descriptions": [{"lang": "en", "value": "When doing a second SMB request to the same host again, curl would wrongly use\na data pointer pointing into already freed memory."}], "providerMetadata": {"orgId": "2499f714-1537-4658-8207-48ae4bb9eae9", "shortName": "curl", "dateUpdated": "2026-03-11T10:09:37.729Z"}, "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-416 Use After Free"}]}], "affected": [{"vendor": "curl", "product": "curl", "versions": [{"version": "8.18.0", "status": "affected", "lessThanOrEqual": "8.18.0", "versionType": "semver"}, {"version": "8.17.0", "status": "affected", "lessThanOrEqual": "8.17.0", "versionType": "semver"}, {"version": "8.16.0", "status": "affected", "lessThanOrEqual": "8.16.0", "versionType": "semver"}, {"version": "8.15.0", "status": "affected", "lessThanOrEqual": "8.15.0", "versionType": "semver"}, {"version": "8.14.1", "status": "affected", "lessThanOrEqual": "8.14.1", "versionType": "semver"}, {"version": "8.14.0", "status": "affected", "lessThanOrEqual": "8.14.0", "versionType": "semver"}, {"version": "8.13.0", "status": "affected", "lessThanOrEqual": "8.13.0", "versionType": "semver"}], "defaultStatus": "unaffected"}], "references": [{"url": "https://curl.se/docs/CVE-2026-3805.json", "name": "json"}, {"url": "https://curl.se/docs/CVE-2026-3805.html", "name": "www"}, {"url": "https://hackerone.com/reports/3591944", "name": "issue"}], "credits": [{"lang": "en", "value": "Daniel Wade", "type": "finder"}, {"lang": "en", "value": "Stefan Eissing", "type": "remediation developer"}]}, "adp": [{"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/03/11/4"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-03-11T10:16:34.391Z"}}, {"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-416", "lang": "en", "description": "CWE-416 Use After Free"}]}], "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": {"timestamp": "2026-03-11T15:45:10.217077Z", "id": "CVE-2026-3805", "options": [{"Exploitation": "poc"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-11T15:45:38.820Z"}}]}}

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-3805", "assignerOrgId": "2499f714-1537-4658-8207-48ae4bb9eae9", "state": "PUBLISHED", "assignerShortName": "curl", "dateReserved": "2026-03-08T16:07:39.817Z", "datePublished": "2026-03-11T10:09:37.729Z", "dateUpdated": "2026-03-11T15:45:38.820Z"}, "containers": {"cna": {"title": "use after free in SMB connection reuse", "descriptions": [{"lang": "en", "value": "When doing a second SMB request to the same host again, curl would wrongly use\na data pointer pointing into already freed memory."}], "providerMetadata": {"orgId": "2499f714-1537-4658-8207-48ae4bb9eae9", "shortName": "curl", "dateUpdated": "2026-03-11T10:09:37.729Z"}, "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-416 Use After Free"}]}], "affected": [{"vendor": "curl", "product": "curl", "versions": [{"version": "8.18.0", "status": "affected", "lessThanOrEqual": "8.18.0", "versionType": "semver"}, {"version": "8.17.0", "status": "affected", "lessThanOrEqual": "8.17.0", "versionType": "semver"}, {"version": "8.16.0", "status": "affected", "lessThanOrEqual": "8.16.0", "versionType": "semver"}, {"version": "8.15.0", "status": "affected", "lessThanOrEqual": "8.15.0", "versionType": "semver"}, {"version": "8.14.1", "status": "affected", "lessThanOrEqual": "8.14.1", "versionType": "semver"}, {"version": "8.14.0", "status": "affected", "lessThanOrEqual": "8.14.0", "versionType": "semver"}, {"version": "8.13.0", "status": "affected", "lessThanOrEqual": "8.13.0", "versionType": "semver"}], "defaultStatus": "unaffected"}], "references": [{"url": "https://curl.se/docs/CVE-2026-3805.json", "name": "json"}, {"url": "https://curl.se/docs/CVE-2026-3805.html", "name": "www"}, {"url": "https://hackerone.com/reports/3591944", "name": "issue"}], "credits": [{"lang": "en", "value": "Daniel Wade", "type": "finder"}, {"lang": "en", "value": "Stefan Eissing", "type": "remediation developer"}]}, "adp": [{"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/03/11/4"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-03-11T10:16:34.391Z"}}, {"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-2026-3805", "role": "CISA Coordinator", "options": [{"Exploitation": "poc"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-03-11T15:45:10.217077Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-11T15:45:22.292Z"}}]}}