# 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. - Web page: https://patchblox.com/security/cve/CVE-2026-11856 - Priority: High - CVSS: 9.8 (Moderate) - EPSS: 0.0069 - 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-2026-11856 ## Description 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 | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | curl Debian 14 | 8.21.0~rc3-1 | [DEBIAN-CVE-2026-11856](https://patchblox.com/security/data/fix/linux/debian-cve-2026-11856.md) | Jul 24, 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_8.8 | [RHSA-2026:80511](https://patchblox.com/security/data/fix/linux/rhsa-2026-80511.md) | Oct 12, 2026 | | Linux | curl Ubuntu 18.04.6 LTS (bionic) | 7.58.0-2ubuntu3.24+esm11 | [curl 7.58.0-2ubuntu3.24+esm11](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-curl-7.58.0-2ubuntu3.24-esm11.md) | Jun 24, 2026 | | Linux | curl Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.25+esm6 | [curl 7.68.0-1ubuntu2.25+esm6](https://patchblox.com/security/data/fix/linux/ubuntu-focal-curl-7.68.0-1ubuntu2.25-esm6.md) | Jun 24, 2026 | | Linux | curl Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.26 | [curl 7.81.0-1ubuntu1.26](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-curl-7.81.0-1ubuntu1.26.md) | Jun 24, 2026 | | Linux | curl Ubuntu 24.04.5 LTS (noble) | 8.5.0-2ubuntu10.12 | [curl 8.5.0-2ubuntu10.12](https://patchblox.com/security/data/fix/linux/ubuntu-noble-curl-8.5.0-2ubuntu10.12.md) | Jun 24, 2026 | | Linux | curl Ubuntu 26.04.1 LTS (resolute) | 8.18.0-1ubuntu2.4 | [curl 8.18.0-1ubuntu2.4](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-curl-8.18.0-1ubuntu2.4.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_8.8 | [ALSA-2026:80511](https://patchblox.com/security/data/fix/linux/alsa-2026-80511.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_8.8 | [ELSA-2026-80511](https://patchblox.com/security/data/fix/linux/elsa-2026-80511.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_8.8 | [RLSA-2026:80511](https://patchblox.com/security/data/fix/linux/rlsa-2026-80511.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 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 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_8.8 | [RHSA-2026:80511](https://patchblox.com/security/data/fix/linux/rhsa-2026-80511.md) | Oct 12, 2026 | | Linux | curl-minimal almalinux 9 | 7.76.1-40.el9_8.8 | [ALSA-2026:80511](https://patchblox.com/security/data/fix/linux/alsa-2026-80511.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_8.8 | [ELSA-2026-80511](https://patchblox.com/security/data/fix/linux/elsa-2026-80511.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 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_8.8 | [RHSA-2026:80511](https://patchblox.com/security/data/fix/linux/rhsa-2026-80511.md) | Oct 12, 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_8.8 | [ALSA-2026:80511](https://patchblox.com/security/data/fix/linux/alsa-2026-80511.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_8.8 | [ELSA-2026-80511](https://patchblox.com/security/data/fix/linux/elsa-2026-80511.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 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_8.8 | [RHSA-2026:80511](https://patchblox.com/security/data/fix/linux/rhsa-2026-80511.md) | Oct 12, 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_8.8 | [ALSA-2026:80511](https://patchblox.com/security/data/fix/linux/alsa-2026-80511.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_8.8 | [ELSA-2026-80511](https://patchblox.com/security/data/fix/linux/elsa-2026-80511.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_8.8 | [RHSA-2026:80511](https://patchblox.com/security/data/fix/linux/rhsa-2026-80511.md) | Oct 12, 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_8.8 | [ALSA-2026:80511](https://patchblox.com/security/data/fix/linux/alsa-2026-80511.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_8.8 | [ELSA-2026-80511](https://patchblox.com/security/data/fix/linux/elsa-2026-80511.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+esm11 | [libcurl3-gnutls 7.58.0-2ubuntu3.24+esm11](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libcurl3-gnutls-7.58.0-2ubuntu3.24-esm11.md) | Jun 24, 2026 | | Linux | libcurl3-gnutls Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.25+esm6 | [libcurl3-gnutls 7.68.0-1ubuntu2.25+esm6](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libcurl3-gnutls-7.68.0-1ubuntu2.25-esm6.md) | Jun 24, 2026 | | Linux | libcurl3-gnutls Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.26 | [libcurl3-gnutls 7.81.0-1ubuntu1.26](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libcurl3-gnutls-7.81.0-1ubuntu1.26.md) | Jun 24, 2026 | | Linux | libcurl3-nss Ubuntu 18.04.6 LTS (bionic) | 7.58.0-2ubuntu3.24+esm11 | [libcurl3-nss 7.58.0-2ubuntu3.24+esm11](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libcurl3-nss-7.58.0-2ubuntu3.24-esm11.md) | Jun 24, 2026 | | Linux | libcurl3-nss Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.25+esm6 | [libcurl3-nss 7.68.0-1ubuntu2.25+esm6](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libcurl3-nss-7.68.0-1ubuntu2.25-esm6.md) | Jun 24, 2026 | | Linux | libcurl3-nss Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.26 | [libcurl3-nss 7.81.0-1ubuntu1.26](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libcurl3-nss-7.81.0-1ubuntu1.26.md) | Jun 24, 2026 | | Linux | libcurl3t64-gnutls Ubuntu 24.04.5 LTS (noble) | 8.5.0-2ubuntu10.12 | [libcurl3t64-gnutls 8.5.0-2ubuntu10.12](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libcurl3t64-gnutls-8.5.0-2ubuntu10.12.md) | Jun 24, 2026 | | Linux | libcurl3t64-gnutls Ubuntu 26.04.1 LTS (resolute) | 8.18.0-1ubuntu2.4 | [libcurl3t64-gnutls 8.18.0-1ubuntu2.4](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libcurl3t64-gnutls-8.18.0-1ubuntu2.4.md) | Jun 24, 2026 | | Linux | libcurl4 Ubuntu 18.04.6 LTS (bionic) | 7.58.0-2ubuntu3.24+esm11 | [libcurl4 7.58.0-2ubuntu3.24+esm11](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libcurl4-7.58.0-2ubuntu3.24-esm11.md) | Jun 24, 2026 | | Linux | libcurl4 Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.25+esm6 | [libcurl4 7.68.0-1ubuntu2.25+esm6](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libcurl4-7.68.0-1ubuntu2.25-esm6.md) | Jun 24, 2026 | | Linux | libcurl4 Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.26 | [libcurl4 7.81.0-1ubuntu1.26](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libcurl4-7.81.0-1ubuntu1.26.md) | Jun 24, 2026 | | Linux | libcurl4t64 Ubuntu 24.04.5 LTS (noble) | 8.5.0-2ubuntu10.12 | [libcurl4t64 8.5.0-2ubuntu10.12](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libcurl4t64-8.5.0-2ubuntu10.12.md) | Jun 24, 2026 | | Linux | libcurl4t64 Ubuntu 26.04.1 LTS (resolute) | 8.18.0-1ubuntu2.4 | [libcurl4t64 8.18.0-1ubuntu2.4](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libcurl4t64-8.18.0-1ubuntu2.4.md) | Jun 24, 2026 | --- Data as of 2026-11-09T07:25:28Z UTC. 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