# CVE-2026-8932: incomplete mTLS config matching in conn reuse

CVE-2026-8932 is fixed in 15 products on 1 platform, first by curl 7.58.0-2ubuntu3.24+esm12, released June 24, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-8932
- Priority: High
- CVSS: 8.1 (Important)
- EPSS: 0.0040
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 24, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-8932

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | curl Debian 14 | 8.21.0~rc2-1 | [DEBIAN-CVE-2026-8932](https://patchblox.com/security/data/fix/linux/debian-cve-2026-8932.md) | Jul 24, 2026 |
| Linux | curl Fedora 43 | 8.15.0-12.fc43 | [FEDORA-2026-D65DA12723](https://patchblox.com/security/data/fix/linux/fedora-2026-d65da12723.md) | Nov 7, 2026 |
| Linux | curl RHEL 10 | 8.12.1-1.el10_0.10 | [RHSA-2026:72506](https://patchblox.com/security/data/fix/linux/rhsa-2026-72506.md) | Jul 3, 2026 |
| Linux | curl RHEL 8 | 0:7.61.1-34.el8_10.18 | [RHSA-2026:92368](https://patchblox.com/security/data/fix/linux/rhsa-2026-92368.md) | Oct 30, 2026 |
| Linux | curl RHEL 9 | 0:7.76.1-40.el9_8.9 | [RHSA-2026:92907](https://patchblox.com/security/data/fix/linux/rhsa-2026-92907.md) | Oct 30, 2026 |
| Linux | curl Ubuntu 18.04.6 LTS (bionic) | 7.58.0-2ubuntu3.24+esm12 | [curl 7.58.0-2ubuntu3.24+esm12](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-curl-7.58.0-2ubuntu3.24-esm12.md) | Jun 24, 2026 |
| Linux | curl Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.25+esm7 | [curl 7.68.0-1ubuntu2.25+esm7](https://patchblox.com/security/data/fix/linux/ubuntu-focal-curl-7.68.0-1ubuntu2.25-esm7.md) | Jun 24, 2026 |
| Linux | curl Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.27 | [curl 7.81.0-1ubuntu1.27](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-curl-7.81.0-1ubuntu1.27.md) | Jun 24, 2026 |
| Linux | curl Ubuntu 24.04.5 LTS (noble) | 8.5.0-2ubuntu10.13 | [curl 8.5.0-2ubuntu10.13](https://patchblox.com/security/data/fix/linux/ubuntu-noble-curl-8.5.0-2ubuntu10.13.md) | Jun 24, 2026 |
| Linux | curl Ubuntu 26.04.1 LTS (resolute) | 8.18.0-1ubuntu2.5 | [curl 8.18.0-1ubuntu2.5](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-curl-8.18.0-1ubuntu2.5.md) | Jun 24, 2026 |
| Linux | curl almalinux 10 | 8.12.1-4.el10_2.6 | [ALSA-2026:69125](https://patchblox.com/security/data/fix/linux/alsa-2026-69125.md) | Sep 21, 2026 |
| Linux | curl almalinux 8 | 7.61.1-34.el8_10.18 | [ALSA-2026:92368](https://patchblox.com/security/data/fix/linux/alsa-2026-92368.md) | Nov 7, 2026 |
| Linux | curl almalinux 9 | 7.76.1-40.el9_8.9 | [ALSA-2026:92907](https://patchblox.com/security/data/fix/linux/alsa-2026-92907.md) | Nov 7, 2026 |
| Linux | curl amzn 2023 | 8.21.0-5.amzn2023.0.1 | [ALAS2023-2026-2132](https://patchblox.com/security/data/fix/linux/alas2023-2026-2132.md) | Sep 14, 2026 |
| Linux | curl ol 10 | 0:8.12.1-4.el10_2.6 | [ELSA-2026-69125](https://patchblox.com/security/data/fix/linux/elsa-2026-69125.md) | Sep 23, 2026 |
| Linux | curl ol 8 | 0:7.61.1-34.el8_10.18 | [ELSA-2026-92368](https://patchblox.com/security/data/fix/linux/elsa-2026-92368.md) | Nov 7, 2026 |
| Linux | curl ol 9 | 0:7.76.1-40.el9_8.9 | [ELSA-2026-92907](https://patchblox.com/security/data/fix/linux/elsa-2026-92907.md) | Nov 7, 2026 |
| Linux | curl rocky 10 | 0:8.12.1-4.el10_2.6 | [RLSA-2026:69125](https://patchblox.com/security/data/fix/linux/rlsa-2026-69125.md) | Sep 22, 2026 |
| Linux | curl rocky 8 | 0:7.61.1-34.el8_10.18 | [RLSA-2026:92368](https://patchblox.com/security/data/fix/linux/rlsa-2026-92368.md) | Nov 7, 2026 |
| Linux | curl rocky 9 | 0:7.76.1-40.el9_8.9 | [RLSA-2026:92907](https://patchblox.com/security/data/fix/linux/rlsa-2026-92907.md) | Nov 7, 2026 |
| Linux | curl sles 15.6 | 8.22.0-150600.4.58.1 | [SUSE-SU-2026:5069-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5069-1.md) | Nov 7, 2026 |
| Linux | curl sles 15.7 | 8.22.0-150700.7.33.1 | [SUSE-SU-2026:5068-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5068-1.md) | Nov 7, 2026 |
| Linux | curl-debuginfo Fedora 43 | 8.15.0-12.fc43 | [FEDORA-2026-D65DA12723](https://patchblox.com/security/data/fix/linux/fedora-2026-d65da12723.md) | Nov 7, 2026 |
| Linux | curl-debuginfo amzn 2023 | 8.21.0-5.amzn2023.0.1 | [ALAS2023-2026-2132](https://patchblox.com/security/data/fix/linux/alas2023-2026-2132.md) | Sep 14, 2026 |
| Linux | curl-debugsource Fedora 43 | 8.15.0-12.fc43 | [FEDORA-2026-D65DA12723](https://patchblox.com/security/data/fix/linux/fedora-2026-d65da12723.md) | Nov 7, 2026 |
| Linux | curl-debugsource amzn 2023 | 8.21.0-5.amzn2023.0.1 | [ALAS2023-2026-2132](https://patchblox.com/security/data/fix/linux/alas2023-2026-2132.md) | Sep 14, 2026 |
| Linux | curl-minimal RHEL 9 | 0:7.76.1-40.el9_8.9 | [RHSA-2026:92907](https://patchblox.com/security/data/fix/linux/rhsa-2026-92907.md) | Oct 30, 2026 |
| Linux | curl-minimal almalinux 9 | 7.76.1-40.el9_8.9 | [ALSA-2026:92907](https://patchblox.com/security/data/fix/linux/alsa-2026-92907.md) | Nov 7, 2026 |
| Linux | curl-minimal amzn 2023 | 8.21.0-5.amzn2023.0.1 | [ALAS2023-2026-2132](https://patchblox.com/security/data/fix/linux/alas2023-2026-2132.md) | Sep 14, 2026 |
| Linux | curl-minimal ol 9 | 0:7.76.1-40.el9_8.9 | [ELSA-2026-92907](https://patchblox.com/security/data/fix/linux/elsa-2026-92907.md) | Nov 7, 2026 |
| Linux | curl-minimal-debuginfo amzn 2023 | 8.21.0-5.amzn2023.0.1 | [ALAS2023-2026-2132](https://patchblox.com/security/data/fix/linux/alas2023-2026-2132.md) | Sep 14, 2026 |
| Linux | libcurl Fedora 43 | 8.15.0-12.fc43 | [FEDORA-2026-D65DA12723](https://patchblox.com/security/data/fix/linux/fedora-2026-d65da12723.md) | Nov 7, 2026 |
| Linux | libcurl RHEL 8 | 0:7.61.1-34.el8_10.18 | [RHSA-2026:92368](https://patchblox.com/security/data/fix/linux/rhsa-2026-92368.md) | Oct 30, 2026 |
| Linux | libcurl RHEL 9 | 0:7.76.1-40.el9_8.9 | [RHSA-2026:92907](https://patchblox.com/security/data/fix/linux/rhsa-2026-92907.md) | Oct 30, 2026 |
| Linux | libcurl almalinux 10 | 8.12.1-4.el10_2.6 | [ALSA-2026:69125](https://patchblox.com/security/data/fix/linux/alsa-2026-69125.md) | Sep 21, 2026 |
| Linux | libcurl almalinux 8 | 7.61.1-34.el8_10.18 | [ALSA-2026:92368](https://patchblox.com/security/data/fix/linux/alsa-2026-92368.md) | Nov 7, 2026 |
| Linux | libcurl almalinux 9 | 7.76.1-40.el9_8.9 | [ALSA-2026:92907](https://patchblox.com/security/data/fix/linux/alsa-2026-92907.md) | Nov 7, 2026 |
| Linux | libcurl amzn 2023 | 8.21.0-5.amzn2023.0.1 | [ALAS2023-2026-2132](https://patchblox.com/security/data/fix/linux/alas2023-2026-2132.md) | Sep 14, 2026 |
| Linux | libcurl ol 10 | 0:8.12.1-4.el10_2.6 | [ELSA-2026-69125](https://patchblox.com/security/data/fix/linux/elsa-2026-69125.md) | Sep 23, 2026 |
| Linux | libcurl ol 8 | 0:7.61.1-34.el8_10.18 | [ELSA-2026-92368](https://patchblox.com/security/data/fix/linux/elsa-2026-92368.md) | Nov 7, 2026 |
| Linux | libcurl ol 9 | 0:7.76.1-40.el9_8.9 | [ELSA-2026-92907](https://patchblox.com/security/data/fix/linux/elsa-2026-92907.md) | Nov 7, 2026 |
| Linux | libcurl-debuginfo Fedora 43 | 8.15.0-12.fc43 | [FEDORA-2026-D65DA12723](https://patchblox.com/security/data/fix/linux/fedora-2026-d65da12723.md) | Nov 7, 2026 |
| Linux | libcurl-debuginfo amzn 2023 | 8.21.0-5.amzn2023.0.1 | [ALAS2023-2026-2132](https://patchblox.com/security/data/fix/linux/alas2023-2026-2132.md) | Sep 14, 2026 |
| Linux | libcurl-devel Fedora 43 | 8.15.0-12.fc43 | [FEDORA-2026-D65DA12723](https://patchblox.com/security/data/fix/linux/fedora-2026-d65da12723.md) | Nov 7, 2026 |
| Linux | libcurl-devel RHEL 8 | 0:7.61.1-34.el8_10.18 | [RHSA-2026:92368](https://patchblox.com/security/data/fix/linux/rhsa-2026-92368.md) | Oct 30, 2026 |
| Linux | libcurl-devel RHEL 9 | 0:7.76.1-40.el9_8.9 | [RHSA-2026:92907](https://patchblox.com/security/data/fix/linux/rhsa-2026-92907.md) | Oct 30, 2026 |
| Linux | libcurl-devel almalinux 10 | 8.12.1-4.el10_2.6 | [ALSA-2026:69125](https://patchblox.com/security/data/fix/linux/alsa-2026-69125.md) | Sep 21, 2026 |
| Linux | libcurl-devel almalinux 8 | 7.61.1-34.el8_10.18 | [ALSA-2026:92368](https://patchblox.com/security/data/fix/linux/alsa-2026-92368.md) | Nov 7, 2026 |
| Linux | libcurl-devel almalinux 9 | 7.76.1-40.el9_8.9 | [ALSA-2026:92907](https://patchblox.com/security/data/fix/linux/alsa-2026-92907.md) | Nov 7, 2026 |
| Linux | libcurl-devel amzn 2023 | 8.21.0-5.amzn2023.0.1 | [ALAS2023-2026-2132](https://patchblox.com/security/data/fix/linux/alas2023-2026-2132.md) | Sep 14, 2026 |
| Linux | libcurl-devel ol 10 | 0:8.12.1-4.el10_2.6 | [ELSA-2026-69125](https://patchblox.com/security/data/fix/linux/elsa-2026-69125.md) | Sep 23, 2026 |
| Linux | libcurl-devel ol 8 | 0:7.61.1-34.el8_10.18 | [ELSA-2026-92368](https://patchblox.com/security/data/fix/linux/elsa-2026-92368.md) | Nov 7, 2026 |
| Linux | libcurl-devel ol 9 | 0:7.76.1-40.el9_8.9 | [ELSA-2026-92907](https://patchblox.com/security/data/fix/linux/elsa-2026-92907.md) | Nov 7, 2026 |
| Linux | libcurl-minimal Fedora 43 | 8.15.0-12.fc43 | [FEDORA-2026-D65DA12723](https://patchblox.com/security/data/fix/linux/fedora-2026-d65da12723.md) | Nov 7, 2026 |
| Linux | libcurl-minimal RHEL 8 | 0:7.61.1-34.el8_10.18 | [RHSA-2026:92368](https://patchblox.com/security/data/fix/linux/rhsa-2026-92368.md) | Oct 30, 2026 |
| Linux | libcurl-minimal RHEL 9 | 0:7.76.1-40.el9_8.9 | [RHSA-2026:92907](https://patchblox.com/security/data/fix/linux/rhsa-2026-92907.md) | Oct 30, 2026 |
| Linux | libcurl-minimal almalinux 10 | 8.12.1-4.el10_2.6 | [ALSA-2026:69125](https://patchblox.com/security/data/fix/linux/alsa-2026-69125.md) | Sep 21, 2026 |
| Linux | libcurl-minimal almalinux 8 | 7.61.1-34.el8_10.18 | [ALSA-2026:92368](https://patchblox.com/security/data/fix/linux/alsa-2026-92368.md) | Nov 7, 2026 |
| Linux | libcurl-minimal almalinux 9 | 7.76.1-40.el9_8.9 | [ALSA-2026:92907](https://patchblox.com/security/data/fix/linux/alsa-2026-92907.md) | Nov 7, 2026 |
| Linux | libcurl-minimal amzn 2023 | 8.21.0-5.amzn2023.0.1 | [ALAS2023-2026-2132](https://patchblox.com/security/data/fix/linux/alas2023-2026-2132.md) | Sep 14, 2026 |
| Linux | libcurl-minimal ol 10 | 0:8.12.1-4.el10_2.6 | [ELSA-2026-69125](https://patchblox.com/security/data/fix/linux/elsa-2026-69125.md) | Sep 23, 2026 |
| Linux | libcurl-minimal ol 8 | 0:7.61.1-34.el8_10.18 | [ELSA-2026-92368](https://patchblox.com/security/data/fix/linux/elsa-2026-92368.md) | Nov 7, 2026 |
| Linux | libcurl-minimal ol 9 | 0:7.76.1-40.el9_8.9 | [ELSA-2026-92907](https://patchblox.com/security/data/fix/linux/elsa-2026-92907.md) | Nov 7, 2026 |
| Linux | libcurl-minimal-debuginfo Fedora 43 | 8.15.0-12.fc43 | [FEDORA-2026-D65DA12723](https://patchblox.com/security/data/fix/linux/fedora-2026-d65da12723.md) | Nov 7, 2026 |
| Linux | libcurl-minimal-debuginfo amzn 2023 | 8.21.0-5.amzn2023.0.1 | [ALAS2023-2026-2132](https://patchblox.com/security/data/fix/linux/alas2023-2026-2132.md) | Sep 14, 2026 |
| Linux | libcurl3-gnutls Ubuntu 18.04.6 LTS (bionic) | 7.58.0-2ubuntu3.24+esm12 | [libcurl3-gnutls 7.58.0-2ubuntu3.24+esm12](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libcurl3-gnutls-7.58.0-2ubuntu3.24-esm12.md) | Jun 24, 2026 |
| Linux | libcurl3-gnutls Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.25+esm7 | [libcurl3-gnutls 7.68.0-1ubuntu2.25+esm7](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libcurl3-gnutls-7.68.0-1ubuntu2.25-esm7.md) | Jun 24, 2026 |
| Linux | libcurl3-gnutls Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.27 | [libcurl3-gnutls 7.81.0-1ubuntu1.27](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libcurl3-gnutls-7.81.0-1ubuntu1.27.md) | Jun 24, 2026 |
| Linux | libcurl3-nss Ubuntu 18.04.6 LTS (bionic) | 7.58.0-2ubuntu3.24+esm12 | [libcurl3-nss 7.58.0-2ubuntu3.24+esm12](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libcurl3-nss-7.58.0-2ubuntu3.24-esm12.md) | Jun 24, 2026 |
| Linux | libcurl3-nss Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.25+esm7 | [libcurl3-nss 7.68.0-1ubuntu2.25+esm7](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libcurl3-nss-7.68.0-1ubuntu2.25-esm7.md) | Jun 24, 2026 |
| Linux | libcurl3-nss Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.27 | [libcurl3-nss 7.81.0-1ubuntu1.27](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libcurl3-nss-7.81.0-1ubuntu1.27.md) | Jun 24, 2026 |
| Linux | libcurl3t64-gnutls Ubuntu 24.04.5 LTS (noble) | 8.5.0-2ubuntu10.13 | [libcurl3t64-gnutls 8.5.0-2ubuntu10.13](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libcurl3t64-gnutls-8.5.0-2ubuntu10.13.md) | Jun 24, 2026 |
| Linux | libcurl3t64-gnutls Ubuntu 26.04.1 LTS (resolute) | 8.18.0-1ubuntu2.5 | [libcurl3t64-gnutls 8.18.0-1ubuntu2.5](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libcurl3t64-gnutls-8.18.0-1ubuntu2.5.md) | Jun 24, 2026 |
| Linux | libcurl4 Ubuntu 18.04.6 LTS (bionic) | 7.58.0-2ubuntu3.24+esm12 | [libcurl4 7.58.0-2ubuntu3.24+esm12](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libcurl4-7.58.0-2ubuntu3.24-esm12.md) | Jun 24, 2026 |
| Linux | libcurl4 Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.25+esm7 | [libcurl4 7.68.0-1ubuntu2.25+esm7](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libcurl4-7.68.0-1ubuntu2.25-esm7.md) | Jun 24, 2026 |
| Linux | libcurl4 Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.27 | [libcurl4 7.81.0-1ubuntu1.27](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libcurl4-7.81.0-1ubuntu1.27.md) | Jun 24, 2026 |
| Linux | libcurl4t64 Ubuntu 24.04.5 LTS (noble) | 8.5.0-2ubuntu10.13 | [libcurl4t64 8.5.0-2ubuntu10.13](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libcurl4t64-8.5.0-2ubuntu10.13.md) | Jun 24, 2026 |
| Linux | libcurl4t64 Ubuntu 26.04.1 LTS (resolute) | 8.18.0-1ubuntu2.5 | [libcurl4t64 8.18.0-1ubuntu2.5](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libcurl4t64-8.18.0-1ubuntu2.5.md) | Jun 24, 2026 |

---

Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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