Vulnerability Report

CVE-2026-8932

Title: mTLS Configuration Bypass via Connection Reuse

Other

Proof Of Concept

PoC Available for CVE-2026-8932

CWE Category NVD-CWE-noinfo
Published Date Jul 03, 2026
Modified Date Jul 07, 2026
Exploit Status Available
Score 7.5 CVSS v
Exploit Probability (EPSS)
0.37%

Vulnerability Summary

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.

Impacted Vendors

H
haxx 1

Reference Links

https://curl.se/docs/CVE-2026-8932.html https://curl.se/docs/CVE-2026-8932.json https://hackerone.com/reports/3733910
CVSS v3.1
Source Entity 134c704f-9b21-4f2e-91b3-4a467353bcc0
Severity HIGH
7.5
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-8932 Exploits & PoCs (Proof Of Concept)

GitHub https://github.com/0xBlackash/CVE-2026-8932
View Code
MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity LOW
Privileges N/A
Interaction NONE
CVSS Vector String CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected Stack

No specific products linked.