CVE-2026-8932

libcurl would reuse a previously created connection even when some mTLS config related option had been changed that should have prohibited reuse. libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse if one of them matches the setup. However, some TLS settings related to client certificates were left out from the configuration match checks, making them match too easily. In particular options related to the private key.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://curl.se/docs/CVE-2026-8932.html	Patch Vendor Advisory
https://curl.se/docs/CVE-2026-8932.json	Vendor Advisory
https://hackerone.com/reports/3733910	Exploit Issue Tracking Third Party Advisory
https://hackerone.com/reports/3733910	Exploit Issue Tracking Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*

History

07 Jul 2026, 23:18

Type	Values Removed	Values Added
CPE		cpe:2.3:a:haxx:curl::::::::
First Time		Haxx curl Haxx
References	~~() https://curl.se/docs/CVE-2026-8932.html -~~	() https://curl.se/docs/CVE-2026-8932.html - Patch, Vendor Advisory
References	~~() https://curl.se/docs/CVE-2026-8932.json -~~	() https://curl.se/docs/CVE-2026-8932.json - Vendor Advisory
References	~~() https://hackerone.com/reports/3733910 -~~	() https://hackerone.com/reports/3733910 - Exploit, Issue Tracking, Third Party Advisory
CWE		NVD-CWE-Other

06 Jul 2026, 18:16

Type	Values Removed	Values Added
References	~~() https://hackerone.com/reports/3733910 -~~	() https://hackerone.com/reports/3733910 -
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 7.5

03 Jul 2026, 07:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-07-03 07:16

Updated : 2026-07-07 23:18

NVD link : CVE-2026-8932

Mitre link : CVE-2026-8932

CVE.ORG link : CVE-2026-8932

JSON object : View

Products Affected

haxx

curl

CWE

NVD-CWE-Other

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"7.9.6"}, {"status": "affected", "version": "7.9.5", "versionType": "semver", "lessThanOrEqual": "7.9.5"}, {"status": "affected", "version": "7.9.4", "versionType": "semver", "lessThanOrEqual": "7.9.4"}, {"status": "affected", "version": "7.9.3", "versionType": "semver", "lessThanOrEqual": "7.9.3"}, {"status": "affected", "version": "7.9.2", "versionType": "semver", "lessThanOrEqual": "7.9.2"}, {"status": "affected", "version": "7.9.1", "versionType": "semver", "lessThanOrEqual": "7.9.1"}, {"status": "affected", "version": "7.9", "versionType": "semver", "lessThanOrEqual": "7.9"}, {"status": "affected", "version": "7.8.1", "versionType": "semver", "lessThanOrEqual": "7.8.1"}, {"status": "affected", "version": "7.8", "versionType": "semver", "lessThanOrEqual": "7.8"}, {"status": "affected", "version": "7.7.3", "versionType": "semver", "lessThanOrEqual": "7.7.3"}, {"status": "affected", "version": "7.7.2", "versionType": "semver", "lessThanOrEqual": "7.7.2"}, {"status": "affected", "version": "7.7.1", "versionType": "semver", "lessThanOrEqual": "7.7.1"}, {"status": "affected", "version": "7.7", "versionType": "semver", "lessThanOrEqual": "7.7"}], "defaultStatus": "unaffected"}]}], "published": "2026-07-03T07:16:25.363", "references": [{"url": "https://curl.se/docs/CVE-2026-8932.html", "tags": ["Patch", "Vendor Advisory"], "source": "2499f714-1537-4658-8207-48ae4bb9eae9"}, {"url": "https://curl.se/docs/CVE-2026-8932.json", "tags": ["Vendor Advisory"], "source": "2499f714-1537-4658-8207-48ae4bb9eae9"}, {"url": "https://hackerone.com/reports/3733910", "tags": ["Exploit", "Issue Tracking", "Third Party Advisory"], "source": "2499f714-1537-4658-8207-48ae4bb9eae9"}, {"url": "https://hackerone.com/reports/3733910", "tags": ["Exploit", "Issue Tracking", "Third Party Advisory"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-Other"}]}], "descriptions": [{"lang": "en", "value": "libcurl would reuse a previously created connection even when some mTLS config\nrelated option had been changed that should have prohibited reuse.\n\nlibcurl keeps previously used connections in a connection pool for subsequent\ntransfers to reuse if one of them matches the setup. However, some TLS\nsettings related to client certificates were left out from the configuration\nmatch checks, making them match too easily. In particular options related to\nthe private key."}], "lastModified": "2026-07-07T23:18:32.137", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F8926D8E-6609-4EFE-A651-42E8E411E990", "versionEndExcluding": "8.21.0", "versionStartIncluding": "7.7"}], "operator": "OR"}]}], "sourceIdentifier": "2499f714-1537-4658-8207-48ae4bb9eae9"}