# CVE-2026-12478: libsoup3: The fix for CVE-2026-0716 (commit 6ff7ef0, libsoup 3.6.6) placed the integer overflow guard inside the if (masked) bl... CVE-2026-12478 is fixed in 14 products on 1 platform, first by DEBIAN-CVE-2026-12478, released July 14, 2026. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2026-12478 - Priority: Routine - CVSS: 4.8 (medium) - EPSS: 0.0024 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jul 14, 2026 ## Description The fix for CVE-2026-0716 (commit 6ff7ef0, libsoup 3.6.6) placed the integer overflow guard inside the if (masked) block, leaving unmasked server-to-client frames unprotected. A malicious WebSocket server can send a crafted unmasked frame with a payload length near UINT64_MAX to trigger an OOB read in a libsoup-based client when max_incoming_payload_size is set to 0. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | gir1.2-soup-3.0 Ubuntu 22.04.1 LTS (jammy) | 3.0.7-0ubuntu1+esm10 | [gir1.2-soup-3.0 3.0.7-0ubuntu1+esm10](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-gir1.2-soup-3.0-3.0.7-0ubuntu1-esm10.md) | Sep 30, 2026 | | Linux | gir1.2-soup-3.0 Ubuntu 24.04.5 LTS (noble) | 3.4.4-5ubuntu0.10 | [gir1.2-soup-3.0 3.4.4-5ubuntu0.10](https://patchblox.com/security/data/fix/linux/ubuntu-noble-gir1.2-soup-3.0-3.4.4-5ubuntu0.10.md) | Sep 30, 2026 | | Linux | gir1.2-soup-3.0 Ubuntu 26.04.1 LTS (resolute) | 3.6.6-1ubuntu0.2 | [gir1.2-soup-3.0 3.6.6-1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-gir1.2-soup-3.0-3.6.6-1ubuntu0.2.md) | Sep 30, 2026 | | Linux | libsoup amzn 2023 | 2.72.0-6.amzn2023.0.15 | [ALAS2023-2026-3154](https://patchblox.com/security/data/fix/linux/alas2023-2026-3154.md) | Nov 7, 2026 | | Linux | libsoup opensuse-leap 16.0 | 3.6.6-160000.3.1 | [OPENSUSE-SU-2026:21871-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21871-1.md) | Sep 17, 2026 | | Linux | libsoup sles 15.6 | 3.4.4-150600.3.56.1 | [SUSE-SU-2026:4558-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4558-1.md) | Oct 7, 2026 | | Linux | libsoup sles 15.7 | 3.4.4-150600.3.56.1 | [SUSE-SU-2026:4558-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4558-1.md) | Oct 7, 2026 | | Linux | libsoup-3.0-0 Ubuntu 22.04.1 LTS (jammy) | 3.0.7-0ubuntu1+esm10 | [libsoup-3.0-0 3.0.7-0ubuntu1+esm10](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libsoup-3.0-0-3.0.7-0ubuntu1-esm10.md) | Sep 30, 2026 | | Linux | libsoup-3.0-0 Ubuntu 24.04.5 LTS (noble) | 3.4.4-5ubuntu0.10 | [libsoup-3.0-0 3.4.4-5ubuntu0.10](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libsoup-3.0-0-3.4.4-5ubuntu0.10.md) | Sep 30, 2026 | | Linux | libsoup-3.0-0 Ubuntu 26.04.1 LTS (resolute) | 3.6.6-1ubuntu0.2 | [libsoup-3.0-0 3.6.6-1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libsoup-3.0-0-3.6.6-1ubuntu0.2.md) | Sep 30, 2026 | | Linux | libsoup-3.0-common Ubuntu 22.04.1 LTS (jammy) | 3.0.7-0ubuntu1+esm10 | [libsoup-3.0-common 3.0.7-0ubuntu1+esm10](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libsoup-3.0-common-3.0.7-0ubuntu1-esm10.md) | Sep 30, 2026 | | Linux | libsoup-3.0-common Ubuntu 24.04.5 LTS (noble) | 3.4.4-5ubuntu0.10 | [libsoup-3.0-common 3.4.4-5ubuntu0.10](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libsoup-3.0-common-3.4.4-5ubuntu0.10.md) | Sep 30, 2026 | | Linux | libsoup-3.0-common Ubuntu 26.04.1 LTS (resolute) | 3.6.6-1ubuntu0.2 | [libsoup-3.0-common 3.6.6-1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libsoup-3.0-common-3.6.6-1ubuntu0.2.md) | Sep 30, 2026 | | Linux | libsoup-3.0-tests Ubuntu 22.04.1 LTS (jammy) | 3.0.7-0ubuntu1+esm10 | [libsoup-3.0-tests 3.0.7-0ubuntu1+esm10](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libsoup-3.0-tests-3.0.7-0ubuntu1-esm10.md) | Sep 30, 2026 | | Linux | libsoup-3.0-tests Ubuntu 24.04.5 LTS (noble) | 3.4.4-5ubuntu0.10 | [libsoup-3.0-tests 3.4.4-5ubuntu0.10](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libsoup-3.0-tests-3.4.4-5ubuntu0.10.md) | Sep 30, 2026 | | Linux | libsoup-3.0-tests Ubuntu 26.04.1 LTS (resolute) | 3.6.6-1ubuntu0.2 | [libsoup-3.0-tests 3.6.6-1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libsoup-3.0-tests-3.6.6-1ubuntu0.2.md) | Sep 30, 2026 | | Linux | libsoup-debuginfo amzn 2023 | 2.72.0-6.amzn2023.0.15 | [ALAS2023-2026-3154](https://patchblox.com/security/data/fix/linux/alas2023-2026-3154.md) | Nov 7, 2026 | | Linux | libsoup-debugsource amzn 2023 | 2.72.0-6.amzn2023.0.15 | [ALAS2023-2026-3154](https://patchblox.com/security/data/fix/linux/alas2023-2026-3154.md) | Nov 7, 2026 | | Linux | libsoup-devel amzn 2023 | 2.72.0-6.amzn2023.0.15 | [ALAS2023-2026-3154](https://patchblox.com/security/data/fix/linux/alas2023-2026-3154.md) | Nov 7, 2026 | | Linux | libsoup-doc amzn 2023 | 2.72.0-6.amzn2023.0.15 | [ALAS2023-2026-3154](https://patchblox.com/security/data/fix/linux/alas2023-2026-3154.md) | Nov 7, 2026 | | Linux | libsoup3 Debian 14 | 3.8.0-1 | [DEBIAN-CVE-2026-12478](https://patchblox.com/security/data/fix/linux/debian-cve-2026-12478.md) | Jul 14, 2026 | | Linux | libsoup3 amzn 2023 | 3.7.2-1.amzn2023 | [ALAS2023-2026-3144](https://patchblox.com/security/data/fix/linux/alas2023-2026-3144.md) | Sep 28, 2026 | | Linux | libsoup3-debuginfo amzn 2023 | 3.7.2-1.amzn2023 | [ALAS2023-2026-3144](https://patchblox.com/security/data/fix/linux/alas2023-2026-3144.md) | Sep 28, 2026 | | Linux | libsoup3-debugsource amzn 2023 | 3.7.2-1.amzn2023 | [ALAS2023-2026-3144](https://patchblox.com/security/data/fix/linux/alas2023-2026-3144.md) | Sep 28, 2026 | | Linux | libsoup3-devel amzn 2023 | 3.7.2-1.amzn2023 | [ALAS2023-2026-3144](https://patchblox.com/security/data/fix/linux/alas2023-2026-3144.md) | Sep 28, 2026 | | Linux | libsoup3-doc amzn 2023 | 3.7.2-1.amzn2023 | [ALAS2023-2026-3144](https://patchblox.com/security/data/fix/linux/alas2023-2026-3144.md) | Sep 28, 2026 | --- Data as of 2026-11-09T01:18:40Z UTC. 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