CVE-2026-11856
cross-origin Digest auth state leak
CVE-2026-11856 is fixed in 15 products on 1 platform, first by curl 7.58.0-2ubuntu3.24+esm11, released June 24, 2026. It is not reported as exploited. Patch Radar priority: High.
High
CVSS
9.8
Moderate
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0069
52nd percentile
Successfully using libcurl to do a transfer to a specific HTTP origin (`hostA`) with **Digest** authentication and then changing the origin to a different one (`hostB`) for a second transfer, reusing the same handle, makes libcurl wrongly pass on the `Authorization:` header field meant for `hostA`, to `hostB`.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| curl · Debian 14 | 8.21.0~rc3-1 | DEBIAN-CVE-2026-11856 | 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_8.8 | RHSA-2026:80511 | Oct 12, 2026 |
| curl · Ubuntu 18.04.6 LTS (bionic) | 7.58.0-2ubuntu3.24+esm11 | curl 7.58.0-2ubuntu3.24+esm11 | Jun 24, 2026 |
| curl · Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.25+esm6 | curl 7.68.0-1ubuntu2.25+esm6 | Jun 24, 2026 |
| curl · Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.26 | curl 7.81.0-1ubuntu1.26 | Jun 24, 2026 |
| curl · Ubuntu 24.04.5 LTS (noble) | 8.5.0-2ubuntu10.12 | curl 8.5.0-2ubuntu10.12 | Jun 24, 2026 |
| curl · Ubuntu 26.04.1 LTS (resolute) | 8.18.0-1ubuntu2.4 | curl 8.18.0-1ubuntu2.4 | Jun 24, 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_8.8 | ALSA-2026:80511 | Nov 7, 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_8.8 | ELSA-2026-80511 | Nov 7, 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_8.8 | RLSA-2026:80511 | Nov 7, 2026 |
| curl · sles 15.6 | 8.22.0-150600.4.58.1 | SUSE-SU-2026:5069-1 | Nov 7, 2026 |
| curl · sles 15.7 | 8.22.0-150700.7.33.1 | SUSE-SU-2026:5068-1 | Nov 7, 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-minimal · RHEL 9 | 0:7.76.1-40.el9_8.8 | RHSA-2026:80511 | Oct 12, 2026 |
| curl-minimal · almalinux 9 | 7.76.1-40.el9_8.8 | ALSA-2026:80511 | Nov 7, 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_8.8 | ELSA-2026-80511 | Nov 7, 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_8.8 | RHSA-2026:80511 | Oct 12, 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_8.8 | ALSA-2026:80511 | Nov 7, 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_8.8 | ELSA-2026-80511 | Nov 7, 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_8.8 | RHSA-2026:80511 | Oct 12, 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_8.8 | ALSA-2026:80511 | Nov 7, 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_8.8 | ELSA-2026-80511 | Nov 7, 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_8.8 | RHSA-2026:80511 | Oct 12, 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_8.8 | ALSA-2026:80511 | Nov 7, 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_8.8 | ELSA-2026-80511 | Nov 7, 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+esm11 | libcurl3-gnutls 7.58.0-2ubuntu3.24+esm11 | Jun 24, 2026 |
| libcurl3-gnutls · Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.25+esm6 | libcurl3-gnutls 7.68.0-1ubuntu2.25+esm6 | Jun 24, 2026 |
| libcurl3-gnutls · Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.26 | libcurl3-gnutls 7.81.0-1ubuntu1.26 | Jun 24, 2026 |
| libcurl3-nss · Ubuntu 18.04.6 LTS (bionic) | 7.58.0-2ubuntu3.24+esm11 | libcurl3-nss 7.58.0-2ubuntu3.24+esm11 | Jun 24, 2026 |
| libcurl3-nss · Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.25+esm6 | libcurl3-nss 7.68.0-1ubuntu2.25+esm6 | Jun 24, 2026 |
| libcurl3-nss · Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.26 | libcurl3-nss 7.81.0-1ubuntu1.26 | Jun 24, 2026 |
| libcurl3t64-gnutls · Ubuntu 24.04.5 LTS (noble) | 8.5.0-2ubuntu10.12 | libcurl3t64-gnutls 8.5.0-2ubuntu10.12 | Jun 24, 2026 |
| libcurl3t64-gnutls · Ubuntu 26.04.1 LTS (resolute) | 8.18.0-1ubuntu2.4 | libcurl3t64-gnutls 8.18.0-1ubuntu2.4 | Jun 24, 2026 |
| libcurl4 · Ubuntu 18.04.6 LTS (bionic) | 7.58.0-2ubuntu3.24+esm11 | libcurl4 7.58.0-2ubuntu3.24+esm11 | Jun 24, 2026 |
| libcurl4 · Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.25+esm6 | libcurl4 7.68.0-1ubuntu2.25+esm6 | Jun 24, 2026 |
| libcurl4 · Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.26 | libcurl4 7.81.0-1ubuntu1.26 | Jun 24, 2026 |
| libcurl4t64 · Ubuntu 24.04.5 LTS (noble) | 8.5.0-2ubuntu10.12 | libcurl4t64 8.5.0-2ubuntu10.12 | Jun 24, 2026 |
| libcurl4t64 · Ubuntu 26.04.1 LTS (resolute) | 8.18.0-1ubuntu2.4 | libcurl4t64 8.18.0-1ubuntu2.4 | Jun 24, 2026 |
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