CVE-2026-8927
env-set cross-proxy Digest auth state leak
CVE-2026-8927 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
9.1
Moderate
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0050
43rd percentile
When reusing a libcurl handle for sequential transfers driven by environment-variable proxy configuration, libcurl fails to clear the proxy authentication state between requests. Specifically, if the initial transfer authenticates against `proxyA` using Digest auth, a subsequent transfer routed through `proxyB` erroneously leaks the `Proxy-Authorization:` header intended solely for `proxyA`.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| curl · Debian 13.5 (trixie) | 8.14.1-2+deb13u7 | DEBIAN-CVE-2026-8927 | Jul 24, 2026 |
| curl · Debian 14 | 8.21.0~rc2-1 | DEBIAN-CVE-2026-8927 | 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_2.4 | ALSA-2026:55432 | Aug 17, 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_2.4 | ELSA-2026-55432 | Aug 17, 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_2.4 | RLSA-2026:55432 | Aug 17, 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_2.4 | ALSA-2026:55432 | Aug 17, 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_2.4 | ELSA-2026-55432 | Aug 17, 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_2.4 | ALSA-2026:55432 | Aug 17, 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_2.4 | ELSA-2026-55432 | Aug 17, 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_2.4 | ALSA-2026:55432 | Aug 17, 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_2.4 | ELSA-2026-55432 | Aug 17, 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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