# CVE-2026-10536: HTTP/2 stream-dependency tree UAF CVE-2026-10536 is fixed in 13 products on 1 platform, first by curl 8.18.0-1ubuntu2.3, released June 24, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-10536 - Priority: High - CVSS: 9.8 (Moderate) - EPSS: 0.0060 - 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-2026-10536 ## Description A use-after-free vulnerability exists in libcurl when an application configures an HTTP/2 stream-dependency tree via `CURLOPT_STREAM_DEPENDS` or `CURLOPT_STREAM_DEPENDS_E`, subsequently invokes `curl_easy_reset()`, and finally terminates the handle with `curl_easy_cleanup()`. During this final cleanup phase, libcurl attempts to access and modify an internal structure that was already freed during the reset operation. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | curl Debian 14 | 8.21.0~rc2-1 | [DEBIAN-CVE-2026-10536](https://patchblox.com/security/data/fix/linux/debian-cve-2026-10536.md) | Jul 24, 2026 | | Linux | curl RHEL 10 | 8.12.1-4.el10_2.7 | [RHSA-2026:80512](https://patchblox.com/security/data/fix/linux/rhsa-2026-80512.md) | Jul 3, 2026 | | Linux | curl Ubuntu 24.04.5 LTS (noble) | 8.5.0-2ubuntu10.11 | [curl 8.5.0-2ubuntu10.11](https://patchblox.com/security/data/fix/linux/ubuntu-noble-curl-8.5.0-2ubuntu10.11.md) | Jul 13, 2026 | | Linux | curl Ubuntu 25.10 (questing) | 8.14.1-2ubuntu1.5 | [curl 8.14.1-2ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-questing-curl-8.14.1-2ubuntu1.5.md) | Jul 21, 2026 | | Linux | curl Ubuntu 26.04.1 LTS (resolute) | 8.18.0-1ubuntu2.3 | [curl 8.18.0-1ubuntu2.3](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-curl-8.18.0-1ubuntu2.3.md) | Jun 24, 2026 | | Linux | curl almalinux 10 | 8.12.1-4.el10_2.7 | [ALSA-2026:80512](https://patchblox.com/security/data/fix/linux/alsa-2026-80512.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_2.7 | [ELSA-2026-80512](https://patchblox.com/security/data/fix/linux/elsa-2026-80512.md) | Nov 7, 2026 | | Linux | curl opensuse-leap 16.0 | 8.14.1-160000.8.1 | [OPENSUSE-SU-2026:21272-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21272-1.md) | Jul 8, 2026 | | Linux | curl rocky 10 | 0:8.12.1-4.el10_2.7 | [RLSA-2026:80512](https://patchblox.com/security/data/fix/linux/rlsa-2026-80512.md) | Nov 7, 2026 | | Linux | curl sles 15.6 | 8.14.1-150600.4.46.1 | [SUSE-SU-2026:2926-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2926-1.md) | Jul 13, 2026 | | Linux | curl sles 15.7 | 8.14.1-150700.7.20.1 | [SUSE-SU-2026:2925-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2925-1.md) | Jul 13, 2026 | | Linux | curl sles 16.0 | 8.14.1-160000.8.1 | [SUSE-SU-2026:22582-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22582-1.md) | Jul 8, 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-mini sles 16.0 | 8.14.1-160000.8.1 | [SUSE-SU-2026:22582-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22582-1.md) | Jul 8, 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-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 almalinux 10 | 8.12.1-4.el10_2.7 | [ALSA-2026:80512](https://patchblox.com/security/data/fix/linux/alsa-2026-80512.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_2.7 | [ELSA-2026-80512](https://patchblox.com/security/data/fix/linux/elsa-2026-80512.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 almalinux 10 | 8.12.1-4.el10_2.7 | [ALSA-2026:80512](https://patchblox.com/security/data/fix/linux/alsa-2026-80512.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_2.7 | [ELSA-2026-80512](https://patchblox.com/security/data/fix/linux/elsa-2026-80512.md) | Nov 7, 2026 | | Linux | libcurl-minimal almalinux 10 | 8.12.1-4.el10_2.7 | [ALSA-2026:80512](https://patchblox.com/security/data/fix/linux/alsa-2026-80512.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_2.7 | [ELSA-2026-80512](https://patchblox.com/security/data/fix/linux/elsa-2026-80512.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 | libcurl3t64-gnutls Ubuntu 24.04.5 LTS (noble) | 8.5.0-2ubuntu10.11 | [libcurl3t64-gnutls 8.5.0-2ubuntu10.11](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libcurl3t64-gnutls-8.5.0-2ubuntu10.11.md) | Jul 13, 2026 | | Linux | libcurl3t64-gnutls Ubuntu 25.10 (questing) | 8.14.1-2ubuntu1.5 | [libcurl3t64-gnutls 8.14.1-2ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libcurl3t64-gnutls-8.14.1-2ubuntu1.5.md) | Jul 21, 2026 | | Linux | libcurl3t64-gnutls Ubuntu 26.04.1 LTS (resolute) | 8.18.0-1ubuntu2.3 | [libcurl3t64-gnutls 8.18.0-1ubuntu2.3](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libcurl3t64-gnutls-8.18.0-1ubuntu2.3.md) | Jun 24, 2026 | | Linux | libcurl4t64 Ubuntu 24.04.5 LTS (noble) | 8.5.0-2ubuntu10.11 | [libcurl4t64 8.5.0-2ubuntu10.11](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libcurl4t64-8.5.0-2ubuntu10.11.md) | Jul 13, 2026 | | Linux | libcurl4t64 Ubuntu 25.10 (questing) | 8.14.1-2ubuntu1.5 | [libcurl4t64 8.14.1-2ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libcurl4t64-8.14.1-2ubuntu1.5.md) | Jul 21, 2026 | | Linux | libcurl4t64 Ubuntu 26.04.1 LTS (resolute) | 8.18.0-1ubuntu2.3 | [libcurl4t64 8.18.0-1ubuntu2.3](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libcurl4t64-8.18.0-1ubuntu2.3.md) | Jun 24, 2026 | --- Data as of 2026-11-09T01:18:40Z UTC. 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