CVE-2026-8932 | incomplete mTLS config matching in conn reuse

Exp

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.

Published: 2026-07-03 Last update: 2026-07-07 Assigner: 2499f714-1537-4658-8207-48ae4bb9eae9 Source: 2499f714-1537-4658-8207-48ae4bb9eae9
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-8932 is rated Exploit Available (55.2/100): CVSS High severity, with low exploitation likelihood (EPSS 0.37%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2026-8932

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2026-8932

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-07-09 0.28% 0.37% +0.09%
2 2026-07-07 0.13% 0.28% +0.15%
3 2026-07-04 — 0.13% —

Full EPSS history (3 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-8932

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 3.6 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2026-8932

GitHub Security Advisory for CVE-2026-8932

GHSA-m7xm-hf59-w6rj · Severity: high — libcurl would reuse a previously created connection even when some mTLS config related option had...

OS Trackers for CVE-2026-8932

vendor priority summary link
debian not yet assigned CVE-2026-8932 not yet assigned priority: Debian including 1 source packages (curl), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 4, resolved 1. https://security-tracker.debian.org/tracker/CVE-2026-8932
suse high CVE-2026-8932 severity important: SUSE including 9 source package names (curl-8.21.0-1.1, curl-fish-completion-8.21.0-1.1, …), 9 product×package rows across 1 product lines (openSUSE Tumbleweed): Fixed 9. https://www.suse.com/security/cve/CVE-2026-8932/
ubuntu low CVE-2026-8932 low priority: Ubuntu including 1 source packages (curl), 9 status rows across 9 suites (bionic, focal, jammy, noble, questing, resolute, trusty, upstream, xenial): needed 8, pending 1. https://ubuntu.com/security/CVE-2026-8932

Affected software / configurations for CVE-2026-8932

Vendor Product Version Raw CPE
haxx curl >= 7.7, < 8.21.0 cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*

References for CVE-2026-8932

URL Tags
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
cvelogic Threat Intelligence