---
id: CVE-2026-8932
title: |-
  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…
summary: |-
  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…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N'
cwe:
  - CWE-305
  - CWE-1025
vendor: haxx
product: curl
affected:
  - 'curl >= 7.7, < 8.21.0'
patched:
  - curl 8.21.0
published: '2026-07-03'
updated: '2026-09-15'
sourceUpdated: '2026-09-15T07:16:33.407'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-8932'
references:
  - url: 'https://curl.se/docs/CVE-2026-8932.html'
    label: 2499f714-1537-4658-8207-48ae4bb9eae9
  - url: 'https://curl.se/docs/CVE-2026-8932.json'
    label: 2499f714-1537-4658-8207-48ae4bb9eae9
  - url: 'https://hackerone.com/reports/3733910'
    label: 2499f714-1537-4658-8207-48ae4bb9eae9
  - url: 'https://hackerone.com/reports/3733910'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8932.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-8932'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2496759'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-8932'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-8932'
  - url: 'https://access.redhat.com/errata/RHSA-2026:29017'
  - url: 'https://access.redhat.com/errata/RHSA-2026:34975'
  - url: 'https://access.redhat.com/errata/RHSA-2026:56869'
tags:
  - nvd
  - cve.org
  - exploit-available
  - csaf
  - vex
  - red-hat
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-07-06T16:58:28.124167Z'
epss: 0.00396
epssPercentile: 0.33585
exploits:
  github: 2
  githubRepos:
    - 'https://github.com/0xBlackash/CVE-2026-8932'
    - 'https://github.com/nimaarek/CVE-2026-8932-PoC'
  checkedAt: '2026-09-21T15:31:16.653Z'
ingestedAt: '2026-07-04T04:55:39.448Z'
---

## Overview

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.

## Affected

- `curl >= 7.7, < 8.21.0`

## Remediation

Upgrade past the affected range:

- `curl 8.21.0`

## Vendor advisories

- **RHSA-2026:29017** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-06-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:29017)
- **RHSA-2026:34975** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-07-02 · [advisory](https://access.redhat.com/errata/RHSA-2026:34975)
- **RHSA-2026:56869** · Red Hat · fixed in: Red Hat JBoss Core Services 2.4.62.SP5 · released 2026-08-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:56869)
- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Confidential Compute Attestation, … · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8932.json)