CVE-2026-8458
wrong reuse for different services
CVE-2026-8458 is fixed in 16 products on 1 platform, first by curl 8.18.0-1ubuntu2.2, released June 26, 2026. It is not reported as exploited. Patch Radar priority: High.
High
CVSS
8.1
Moderate
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0037
31st percentile
libcurl might in some circumstances reuse the wrong connection when asked to do Negotiate-authenticated ones, even when they are set to use different "services". libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criteria must be met. Due to a logical error in the code, a request that was issued by an application could wrongfully reuse an existing connection to the same server that was authenticated using different services.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| curl · Debian 14 | 8.21.0~rc2-1 | DEBIAN-CVE-2026-8458 | Jul 24, 2026 |
| curl · RHEL 10 | 8.12.1-1.el10_0.10 | RHSA-2026:72506 | Jul 3, 2026 |
| curl · RHEL 8 | 0:7.61.1-34.el8_10.18 | RHSA-2026:92368 | Oct 30, 2026 |
| curl · RHEL 9 | 0:7.76.1-40.el9_8.7 | RHSA-2026:69126 | Sep 22, 2026 |
| curl · Ubuntu 18.04.6 LTS (bionic) | 7.58.0-2ubuntu3.24+esm9 | curl 7.58.0-2ubuntu3.24+esm9 | Jul 3, 2026 |
| curl · Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.25+esm4 | curl 7.68.0-1ubuntu2.25+esm4 | Jul 3, 2026 |
| curl · Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.25 | curl 7.81.0-1ubuntu1.25 | Jul 3, 2026 |
| curl · Ubuntu 24.04.5 LTS (noble) | 8.5.0-2ubuntu10.10 | curl 8.5.0-2ubuntu10.10 | Jul 3, 2026 |
| curl · Ubuntu 25.10 (questing) | 8.14.1-2ubuntu1.4 | curl 8.14.1-2ubuntu1.4 | Jul 3, 2026 |
| curl · Ubuntu 26.04.1 LTS (resolute) | 8.18.0-1ubuntu2.2 | curl 8.18.0-1ubuntu2.2 | Jun 26, 2026 |
| curl · almalinux 10 | 8.12.1-4.el10_2.6 | ALSA-2026:69125 | Sep 21, 2026 |
| curl · almalinux 8 | 7.61.1-34.el8_10.18 | ALSA-2026:92368 | Nov 7, 2026 |
| curl · almalinux 9 | 7.76.1-40.el9_8.7 | ALSA-2026:69126 | Sep 21, 2026 |
| curl · amzn 2023 | 8.21.0-5.amzn2023.0.1 | ALAS2023-2026-2132 | Sep 14, 2026 |
| curl · ol 10 | 0:8.12.1-4.el10_2.6 | ELSA-2026-69125 | Sep 23, 2026 |
| curl · ol 8 | 0:7.61.1-34.el8_10.18 | ELSA-2026-92368 | Nov 7, 2026 |
| curl · ol 9 | 0:7.76.1-40.el9_8.7 | ELSA-2026-69126 | Sep 21, 2026 |
| curl · opensuse-leap 16.0 | 8.14.1-160000.8.1 | OPENSUSE-SU-2026:21272-1 | Jul 8, 2026 |
| curl · rocky 10 | 0:8.12.1-4.el10_2.6 | RLSA-2026:69125 | Sep 22, 2026 |
| curl · rocky 8 | 0:7.61.1-34.el8_10.18 | RLSA-2026:92368 | Nov 7, 2026 |
| curl · rocky 9 | 0:7.76.1-40.el9_8.7 | RLSA-2026:69126 | Sep 22, 2026 |
| curl · sles 15.6 | 8.14.1-150600.4.46.1 | SUSE-SU-2026:2926-1 | Jul 13, 2026 |
| curl · sles 15.7 | 8.14.1-150700.7.20.1 | SUSE-SU-2026:2925-1 | Jul 13, 2026 |
| curl · sles 16.0 | 8.14.1-160000.8.1 | SUSE-SU-2026:22582-1 | Jul 8, 2026 |
| curl-debuginfo · amzn 2023 | 8.21.0-5.amzn2023.0.1 | ALAS2023-2026-2132 | Sep 14, 2026 |
| curl-debugsource · amzn 2023 | 8.21.0-5.amzn2023.0.1 | ALAS2023-2026-2132 | Sep 14, 2026 |
| curl-mini · sles 16.0 | 8.14.1-160000.8.1 | SUSE-SU-2026:22582-1 | Jul 8, 2026 |
| curl-minimal · RHEL 9 | 0:7.76.1-40.el9_8.7 | RHSA-2026:69126 | Sep 22, 2026 |
| curl-minimal · almalinux 9 | 7.76.1-40.el9_8.7 | ALSA-2026:69126 | Sep 21, 2026 |
| curl-minimal · amzn 2023 | 8.21.0-5.amzn2023.0.1 | ALAS2023-2026-2132 | Sep 14, 2026 |
| curl-minimal · ol 9 | 0:7.76.1-40.el9_8.7 | ELSA-2026-69126 | Sep 21, 2026 |
| curl-minimal-debuginfo · amzn 2023 | 8.21.0-5.amzn2023.0.1 | ALAS2023-2026-2132 | Sep 14, 2026 |
| libcurl · RHEL 8 | 0:7.61.1-34.el8_10.18 | RHSA-2026:92368 | Oct 30, 2026 |
| libcurl · RHEL 9 | 0:7.76.1-40.el9_8.7 | RHSA-2026:69126 | Sep 22, 2026 |
| libcurl · almalinux 10 | 8.12.1-4.el10_2.6 | ALSA-2026:69125 | Sep 21, 2026 |
| libcurl · almalinux 8 | 7.61.1-34.el8_10.18 | ALSA-2026:92368 | Nov 7, 2026 |
| libcurl · almalinux 9 | 7.76.1-40.el9_8.7 | ALSA-2026:69126 | Sep 21, 2026 |
| libcurl · amzn 2023 | 8.21.0-5.amzn2023.0.1 | ALAS2023-2026-2132 | Sep 14, 2026 |
| libcurl · ol 10 | 0:8.12.1-4.el10_2.6 | ELSA-2026-69125 | Sep 23, 2026 |
| libcurl · ol 8 | 0:7.61.1-34.el8_10.18 | ELSA-2026-92368 | Nov 7, 2026 |
| libcurl · ol 9 | 0:7.76.1-40.el9_8.7 | ELSA-2026-69126 | Sep 21, 2026 |
| libcurl-debuginfo · amzn 2023 | 8.21.0-5.amzn2023.0.1 | ALAS2023-2026-2132 | Sep 14, 2026 |
| libcurl-devel · RHEL 8 | 0:7.61.1-34.el8_10.18 | RHSA-2026:92368 | Oct 30, 2026 |
| libcurl-devel · RHEL 9 | 0:7.76.1-40.el9_8.7 | RHSA-2026:69126 | Sep 22, 2026 |
| libcurl-devel · almalinux 10 | 8.12.1-4.el10_2.6 | ALSA-2026:69125 | Sep 21, 2026 |
| libcurl-devel · almalinux 8 | 7.61.1-34.el8_10.18 | ALSA-2026:92368 | Nov 7, 2026 |
| libcurl-devel · almalinux 9 | 7.76.1-40.el9_8.7 | ALSA-2026:69126 | Sep 21, 2026 |
| libcurl-devel · amzn 2023 | 8.21.0-5.amzn2023.0.1 | ALAS2023-2026-2132 | Sep 14, 2026 |
| libcurl-devel · ol 10 | 0:8.12.1-4.el10_2.6 | ELSA-2026-69125 | Sep 23, 2026 |
| libcurl-devel · ol 8 | 0:7.61.1-34.el8_10.18 | ELSA-2026-92368 | Nov 7, 2026 |
| libcurl-devel · ol 9 | 0:7.76.1-40.el9_8.7 | ELSA-2026-69126 | Sep 21, 2026 |
| libcurl-minimal · RHEL 8 | 0:7.61.1-34.el8_10.18 | RHSA-2026:92368 | Oct 30, 2026 |
| libcurl-minimal · RHEL 9 | 0:7.76.1-40.el9_8.7 | RHSA-2026:69126 | Sep 22, 2026 |
| libcurl-minimal · almalinux 10 | 8.12.1-4.el10_2.6 | ALSA-2026:69125 | Sep 21, 2026 |
| libcurl-minimal · almalinux 8 | 7.61.1-34.el8_10.18 | ALSA-2026:92368 | Nov 7, 2026 |
| libcurl-minimal · almalinux 9 | 7.76.1-40.el9_8.7 | ALSA-2026:69126 | Sep 21, 2026 |
| libcurl-minimal · amzn 2023 | 8.21.0-5.amzn2023.0.1 | ALAS2023-2026-2132 | Sep 14, 2026 |
| libcurl-minimal · ol 10 | 0:8.12.1-4.el10_2.6 | ELSA-2026-69125 | Sep 23, 2026 |
| libcurl-minimal · ol 8 | 0:7.61.1-34.el8_10.18 | ELSA-2026-92368 | Nov 7, 2026 |
| libcurl-minimal · ol 9 | 0:7.76.1-40.el9_8.7 | ELSA-2026-69126 | Sep 21, 2026 |
| libcurl-minimal-debuginfo · amzn 2023 | 8.21.0-5.amzn2023.0.1 | ALAS2023-2026-2132 | Sep 14, 2026 |
| libcurl3-gnutls · Ubuntu 18.04.6 LTS (bionic) | 7.58.0-2ubuntu3.24+esm9 | libcurl3-gnutls 7.58.0-2ubuntu3.24+esm9 | Jul 3, 2026 |
| libcurl3-gnutls · Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.25+esm4 | libcurl3-gnutls 7.68.0-1ubuntu2.25+esm4 | Jul 3, 2026 |
| libcurl3-gnutls · Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.25 | libcurl3-gnutls 7.81.0-1ubuntu1.25 | Jul 3, 2026 |
| libcurl3-nss · Ubuntu 18.04.6 LTS (bionic) | 7.58.0-2ubuntu3.24+esm9 | libcurl3-nss 7.58.0-2ubuntu3.24+esm9 | Jul 3, 2026 |
| libcurl3-nss · Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.25+esm4 | libcurl3-nss 7.68.0-1ubuntu2.25+esm4 | Jul 3, 2026 |
| libcurl3-nss · Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.25 | libcurl3-nss 7.81.0-1ubuntu1.25 | Jul 3, 2026 |
| libcurl3t64-gnutls · Ubuntu 24.04.5 LTS (noble) | 8.5.0-2ubuntu10.10 | libcurl3t64-gnutls 8.5.0-2ubuntu10.10 | Jul 3, 2026 |
| libcurl3t64-gnutls · Ubuntu 25.10 (questing) | 8.14.1-2ubuntu1.4 | libcurl3t64-gnutls 8.14.1-2ubuntu1.4 | Jul 3, 2026 |
| libcurl3t64-gnutls · Ubuntu 26.04.1 LTS (resolute) | 8.18.0-1ubuntu2.2 | libcurl3t64-gnutls 8.18.0-1ubuntu2.2 | Jun 26, 2026 |
| libcurl4 · Ubuntu 18.04.6 LTS (bionic) | 7.58.0-2ubuntu3.24+esm9 | libcurl4 7.58.0-2ubuntu3.24+esm9 | Jul 3, 2026 |
| libcurl4 · Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.25+esm4 | libcurl4 7.68.0-1ubuntu2.25+esm4 | Jul 3, 2026 |
| libcurl4 · Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.25 | libcurl4 7.81.0-1ubuntu1.25 | Jul 3, 2026 |
| libcurl4t64 · Ubuntu 24.04.5 LTS (noble) | 8.5.0-2ubuntu10.10 | libcurl4t64 8.5.0-2ubuntu10.10 | Jul 3, 2026 |
| libcurl4t64 · Ubuntu 25.10 (questing) | 8.14.1-2ubuntu1.4 | libcurl4t64 8.14.1-2ubuntu1.4 | Jul 3, 2026 |
| libcurl4t64 · Ubuntu 26.04.1 LTS (resolute) | 8.18.0-1ubuntu2.2 | libcurl4t64 8.18.0-1ubuntu2.2 | Jun 26, 2026 |
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