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libcurl CVE-2026-8932

| EUVDEUVD-2026-41509 HIGH
2026-06-24 GHSA-m7xm-hf59-w6rj
Information Disclosure Curl
7.5
CVSS 3.1 · Vendor
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Severity by source

Vendor (CNA) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
vuln.today AI
5.9 MEDIUM

Integrity-only impact from using the wrong mTLS identity (I:H, C:N/A:N); AC:H because it needs the specific handle-reuse-with-changed-client-cert pattern, with no attacker privileges or interaction required.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
4.0 AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
SUSE
7.4 HIGH
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Primary rating from Vendor (CNA).

CVSS VectorVendor

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

Lifecycle Timeline

7
Analysis Updated
Jul 06, 2026 - 18:48 vuln.today
v5 (cvss_changed)
Analysis Updated
Jul 06, 2026 - 18:47 vuln.today
v4 (cvss_changed)
Analysis Updated
Jul 06, 2026 - 18:45 vuln.today
v3 (cvss_changed)
Analysis Updated
Jul 06, 2026 - 18:45 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Jul 06, 2026 - 18:22 vuln.today
cvss_changed
CVSS changed
Jul 06, 2026 - 18:22 NVD
7.5 (HIGH)
Analysis Generated
Jun 24, 2026 - 18:23 vuln.today

Description PRE-NVD

Disclosed via oss-security. NVD scoring and full description are pending.

AnalysisAI

Incorrect mTLS connection reuse in libcurl (curl releases through 8.16.0) causes the library to reuse a pooled TLS connection even after client-certificate options - notably the private key - were changed in a way that should have forced a fresh handshake. Because those client-certificate settings were omitted from the connection-match logic, a later transfer can be sent over a connection authenticated with the wrong client identity, an integrity failure tagged as information disclosure. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
App reuses libcurl handle to same host
Delivery
Change client cert/private key mid-session
Exploit
Reuse check ignores private-key options
Execution
Stale pooled connection reused
Impact
Transfer sent under wrong mTLS identity
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Vulnerability AssessmentAI

Exploitation Exploitation requires an application that reuses a single libcurl handle (or a shared connection pool) for multiple transfers to the same origin AND changes the client-certificate/private-key options between those transfers - specifically the private-key-related mTLS settings excluded from the connection-match check - while the target host uses mutual TLS so the mismatched identity is meaningful. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The signals are consistent in pointing to a low-to-moderate real-world priority despite the 7.5 base score. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An application or scripted curl usage performs multiple HTTPS transfers over a reused libcurl handle to the same host, switching the client certificate/private key between requests to represent different users or tenants. Because the private-key options are excluded from the reuse check, libcurl silently reuses the first connection, so a later transfer is delivered over a session authenticated with the previous identity's certificate. …
Remediation Upgrade libcurl to the fixed release announced in the curl project advisory at https://curl.se/docs/CVE-2026-8932.html; the provided input does not contain the exact patched version string, so treat the curl.se advisory and its JSON as the source of truth for the fixed version rather than an invented number - Patch available per vendor advisory, released patched version not independently confirmed from the provided data. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

24 hours: Identify all applications and services using libcurl, particularly those relying on client certificate authentication for API or inter-system communication. …

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CVE-2026-8932 vulnerability details – vuln.today
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