# CVE-2026-15709: Soupwebsocketextensiondeflate: libsoup: libsoup: websocket permessage-deflate unbounded decompression remote denial of service CVE-2026-15709 is fixed in 14 products on 1 platform, first by RHSA-2026:71389, released July 14, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-15709 - Priority: High - CVSS: 7.5 (Important) - EPSS: 0.0088 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jul 14, 2026 - Weakness: Improper Handling of Highly Compressed Data (Data Amplification) - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-15709 ## Description The libsoup packages provide an HTTP client and server library for GNOME. Security Fix(es): * SoupWebsocketExtensionDeflate: libsoup: libsoup: WebSocket permessage-deflate Unbounded Decompression Remote Denial of Service (CVE-2026-15709) * libsoup: SoupWebsocketConnection: libsoup: WebSocket remote denial of service via oversized control frame protocol violation (CVE-2026-15711) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | libsoup RHEL 9 | 0:2.72.0-16.el9_8.3 | [RHSA-2026:68234](https://patchblox.com/security/data/fix/linux/rhsa-2026-68234.md) | Sep 19, 2026 | | Linux | libsoup almalinux 9 | 2.72.0-16.el9_8.3 | [ALSA-2026:68234](https://patchblox.com/security/data/fix/linux/alsa-2026-68234.md) | Sep 16, 2026 | | Linux | libsoup amzn 2023 | 2.72.0-6.amzn2023.0.14 | [ALAS2023-2026-2160](https://patchblox.com/security/data/fix/linux/alas2023-2026-2160.md) | Sep 14, 2026 | | Linux | libsoup ol 9 | 0:2.72.0-16.el9_8.3 | [ELSA-2026-68234](https://patchblox.com/security/data/fix/linux/elsa-2026-68234.md) | Sep 16, 2026 | | Linux | libsoup rocky 9 | 0:2.72.0-16.el9_8.3 | [RLSA-2026:68234](https://patchblox.com/security/data/fix/linux/rlsa-2026-68234.md) | Sep 17, 2026 | | Linux | libsoup-debuginfo amzn 2023 | 2.72.0-6.amzn2023.0.14 | [ALAS2023-2026-2160](https://patchblox.com/security/data/fix/linux/alas2023-2026-2160.md) | Sep 14, 2026 | | Linux | libsoup-debugsource amzn 2023 | 2.72.0-6.amzn2023.0.14 | [ALAS2023-2026-2160](https://patchblox.com/security/data/fix/linux/alas2023-2026-2160.md) | Sep 14, 2026 | | Linux | libsoup-devel RHEL 9 | 0:2.72.0-16.el9_8.3 | [RHSA-2026:68234](https://patchblox.com/security/data/fix/linux/rhsa-2026-68234.md) | Sep 19, 2026 | | Linux | libsoup-devel almalinux 9 | 2.72.0-16.el9_8.3 | [ALSA-2026:68234](https://patchblox.com/security/data/fix/linux/alsa-2026-68234.md) | Sep 16, 2026 | | Linux | libsoup-devel amzn 2023 | 2.72.0-6.amzn2023.0.14 | [ALAS2023-2026-2160](https://patchblox.com/security/data/fix/linux/alas2023-2026-2160.md) | Sep 14, 2026 | | Linux | libsoup-devel ol 9 | 0:2.72.0-16.el9_8.3 | [ELSA-2026-68234](https://patchblox.com/security/data/fix/linux/elsa-2026-68234.md) | Sep 16, 2026 | | Linux | libsoup-doc amzn 2023 | 2.72.0-6.amzn2023.0.14 | [ALAS2023-2026-2160](https://patchblox.com/security/data/fix/linux/alas2023-2026-2160.md) | Sep 14, 2026 | | Linux | libsoup3 Fedora 43 | 3.6.6-5.fc43 | [FEDORA-2026-FCE2F41203](https://patchblox.com/security/data/fix/linux/fedora-2026-fce2f41203.md) | Sep 5, 2026 | | Linux | libsoup3 RHEL 10 | 3.6.5-3.el10_0.17 | [RHSA-2026:71389](https://patchblox.com/security/data/fix/linux/rhsa-2026-71389.md) | Jul 14, 2026 | | Linux | libsoup3 almalinux 10 | 3.6.5-3.el10_2.14 | [ALSA-2026:68235](https://patchblox.com/security/data/fix/linux/alsa-2026-68235.md) | Sep 16, 2026 | | Linux | libsoup3 amzn 2023 | 3.6.6-60.amzn2023 | [ALAS2023-2026-2159](https://patchblox.com/security/data/fix/linux/alas2023-2026-2159.md) | Sep 14, 2026 | | Linux | libsoup3 ol 10 | 0:3.6.5-3.el10_2.14 | [ELSA-2026-68235](https://patchblox.com/security/data/fix/linux/elsa-2026-68235.md) | Sep 17, 2026 | | Linux | libsoup3-debuginfo Fedora 43 | 3.6.6-5.fc43 | [FEDORA-2026-FCE2F41203](https://patchblox.com/security/data/fix/linux/fedora-2026-fce2f41203.md) | Sep 5, 2026 | | Linux | libsoup3-debuginfo amzn 2023 | 3.6.6-60.amzn2023 | [ALAS2023-2026-2159](https://patchblox.com/security/data/fix/linux/alas2023-2026-2159.md) | Sep 14, 2026 | | Linux | libsoup3-debugsource Fedora 43 | 3.6.6-5.fc43 | [FEDORA-2026-FCE2F41203](https://patchblox.com/security/data/fix/linux/fedora-2026-fce2f41203.md) | Sep 5, 2026 | | Linux | libsoup3-debugsource amzn 2023 | 3.6.6-60.amzn2023 | [ALAS2023-2026-2159](https://patchblox.com/security/data/fix/linux/alas2023-2026-2159.md) | Sep 14, 2026 | | Linux | libsoup3-devel Fedora 43 | 3.6.6-5.fc43 | [FEDORA-2026-FCE2F41203](https://patchblox.com/security/data/fix/linux/fedora-2026-fce2f41203.md) | Sep 5, 2026 | | Linux | libsoup3-devel almalinux 10 | 3.6.5-3.el10_2.14 | [ALSA-2026:68235](https://patchblox.com/security/data/fix/linux/alsa-2026-68235.md) | Sep 16, 2026 | | Linux | libsoup3-devel amzn 2023 | 3.6.6-60.amzn2023 | [ALAS2023-2026-2159](https://patchblox.com/security/data/fix/linux/alas2023-2026-2159.md) | Sep 14, 2026 | | Linux | libsoup3-devel ol 10 | 0:3.6.5-3.el10_2.14 | [ELSA-2026-68235](https://patchblox.com/security/data/fix/linux/elsa-2026-68235.md) | Sep 17, 2026 | | Linux | libsoup3-doc Fedora 43 | 3.6.6-5.fc43 | [FEDORA-2026-FCE2F41203](https://patchblox.com/security/data/fix/linux/fedora-2026-fce2f41203.md) | Sep 5, 2026 | | Linux | libsoup3-doc almalinux 10 | 3.6.5-3.el10_2.14 | [ALSA-2026:68235](https://patchblox.com/security/data/fix/linux/alsa-2026-68235.md) | Sep 16, 2026 | | Linux | libsoup3-doc amzn 2023 | 3.6.6-60.amzn2023 | [ALAS2023-2026-2159](https://patchblox.com/security/data/fix/linux/alas2023-2026-2159.md) | Sep 14, 2026 | | Linux | libsoup3-doc ol 10 | 0:3.6.5-3.el10_2.14 | [ELSA-2026-68235](https://patchblox.com/security/data/fix/linux/elsa-2026-68235.md) | Sep 17, 2026 | | Linux | mingw32-libsoup3 Fedora 43 | 3.6.6-5.fc43 | [FEDORA-2026-FCE2F41203](https://patchblox.com/security/data/fix/linux/fedora-2026-fce2f41203.md) | Sep 5, 2026 | | Linux | mingw32-libsoup3-debuginfo Fedora 43 | 3.6.6-5.fc43 | [FEDORA-2026-FCE2F41203](https://patchblox.com/security/data/fix/linux/fedora-2026-fce2f41203.md) | Sep 5, 2026 | | Linux | mingw64-libsoup3 Fedora 43 | 3.6.6-5.fc43 | [FEDORA-2026-FCE2F41203](https://patchblox.com/security/data/fix/linux/fedora-2026-fce2f41203.md) | Sep 5, 2026 | | Linux | mingw64-libsoup3-debuginfo Fedora 43 | 3.6.6-5.fc43 | [FEDORA-2026-FCE2F41203](https://patchblox.com/security/data/fix/linux/fedora-2026-fce2f41203.md) | Sep 5, 2026 | --- Data as of 2026-11-08T13:06:02Z UTC. 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