libsoup3: A flaw was found in libsoup, a library for handling HTTP requests
CVE-2026-4271 is fixed in 8 products on 1 platform, first by RHSA-2026:17482, released March 30, 2026. It is not reported as exploited. Patch Radar priority: Routine.
A flaw was found in libsoup, a library for handling HTTP requests. This vulnerability, known as a Use-After-Free, occurs in the HTTP/2 server implementation. A remote attacker can exploit this by sending specially crafted HTTP/2 requests that cause authentication failures. This can lead to the application attempting to access memory that has already been freed, potentially causing application instability or crashes, resulting in a Denial of Service (DoS).
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| gir1.2-soup-3.0 · Ubuntu 24.04.5 LTS (noble) | 3.4.4-5ubuntu0.9 | gir1.2-soup-3.0 3.4.4-5ubuntu0.9 | Sep 4, 2026 |
| gir1.2-soup-3.0 · Ubuntu 26.04.1 LTS (resolute) | 3.6.6-1ubuntu0.1 | gir1.2-soup-3.0 3.6.6-1ubuntu0.1 | Sep 4, 2026 |
| libsoup · sles 15.6 | 3.4.4-150600.3.47.1 | SUSE-SU-2026:2314-1 | Jun 9, 2026 |
| libsoup · sles 15.7 | 3.4.4-150600.3.47.1 | SUSE-SU-2026:2314-1 | Jun 9, 2026 |
| libsoup · sles 16.0 | 3.6.6-160000.2.1 | SUSE-SU-2026:21998-1 | May 29, 2026 |
| libsoup-3.0-0 · Ubuntu 24.04.5 LTS (noble) | 3.4.4-5ubuntu0.9 | libsoup-3.0-0 3.4.4-5ubuntu0.9 | Sep 4, 2026 |
| libsoup-3.0-0 · Ubuntu 26.04.1 LTS (resolute) | 3.6.6-1ubuntu0.1 | libsoup-3.0-0 3.6.6-1ubuntu0.1 | Sep 4, 2026 |
| libsoup-3.0-common · Ubuntu 24.04.5 LTS (noble) | 3.4.4-5ubuntu0.9 | libsoup-3.0-common 3.4.4-5ubuntu0.9 | Sep 4, 2026 |
| libsoup-3.0-common · Ubuntu 26.04.1 LTS (resolute) | 3.6.6-1ubuntu0.1 | libsoup-3.0-common 3.6.6-1ubuntu0.1 | Sep 4, 2026 |
| libsoup-3.0-tests · Ubuntu 24.04.5 LTS (noble) | 3.4.4-5ubuntu0.9 | libsoup-3.0-tests 3.4.4-5ubuntu0.9 | Sep 4, 2026 |
| libsoup-3.0-tests · Ubuntu 26.04.1 LTS (resolute) | 3.6.6-1ubuntu0.1 | libsoup-3.0-tests 3.6.6-1ubuntu0.1 | Sep 4, 2026 |
| libsoup3 · RHEL 10 | 3.6.5-3.el10_0.15 | RHSA-2026:17482 | Mar 30, 2026 |
| libsoup3 · almalinux 10 | 3.6.5-3.el10_2.11 | ALSA-2026:19143 | May 19, 2026 |
| libsoup3 · ol 10 | 0:3.6.5-3.el10_1.11 | ELSA-2026-15968 | May 11, 2026 |
| libsoup3 · rocky 10 | 0:3.6.5-3.el10_1.11 | RLSA-2026:15968 | May 13, 2026 |
| libsoup3-devel · almalinux 10 | 3.6.5-3.el10_2.11 | ALSA-2026:19143 | May 19, 2026 |
| libsoup3-devel · ol 10 | 0:3.6.5-3.el10_1.11 | ELSA-2026-15968 | May 11, 2026 |
| libsoup3-doc · almalinux 10 | 3.6.5-3.el10_2.11 | ALSA-2026:19143 | May 19, 2026 |
| libsoup3-doc · ol 10 | 0:3.6.5-3.el10_1.11 | ELSA-2026-15968 | May 11, 2026 |
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