# CVE-2025-4476: Libsoup: null pointer dereference in libsoup may lead to denial of service

CVE-2025-4476 is fixed in 23 products on 1 platform, first by gir1.2-soup-2.4 2.62.1-1ubuntu0.4+esm4, released May 16, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-4476
- Priority: Routine
- CVSS: 4.3 (Moderate)
- EPSS: 0.0055
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 16, 2025
- Weakness: NULL Pointer Dereference
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-4476

## Description

A denial-of-service vulnerability has been identified in the libsoup HTTPclient library. This flaw can be triggered when a libsoup client receives a401 (Unauthorized) HTTP response containing a specifically crafted domainparameter within the WWW-Authenticate header. Processing this malformedheader can lead to a crash of the client application using libsoup. Anattacker could exploit this by setting up a malicious HTTP server. If auser's application using the vulnerable libsoup library connects to thismalicious server, it could result in a denial-of-service. Successfulexploitation requires tricking a user's client application into connectingto the attacker's malicious server.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | gir1.2-soup-2.4 Ubuntu 18.04.6 LTS (bionic) | 2.62.1-1ubuntu0.4+esm4 | [gir1.2-soup-2.4 2.62.1-1ubuntu0.4+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-gir1.2-soup-2.4-2.62.1-1ubuntu0.4-esm4.md) | May 16, 2025 |
| Linux | gir1.2-soup-2.4 Ubuntu 20.04 LTS (focal) | 2.70.0-1ubuntu0.5 | [gir1.2-soup-2.4 2.70.0-1ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-focal-gir1.2-soup-2.4-2.70.0-1ubuntu0.5.md) | May 16, 2025 |
| Linux | gir1.2-soup-2.4 Ubuntu 22.04.1 LTS (jammy) | 2.74.2-3ubuntu0.5 | [gir1.2-soup-2.4 2.74.2-3ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-gir1.2-soup-2.4-2.74.2-3ubuntu0.5.md) | May 16, 2025 |
| Linux | gir1.2-soup-2.4 Ubuntu 24.04.5 LTS (noble) | 2.74.3-6ubuntu1.5 | [gir1.2-soup-2.4 2.74.3-6ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-noble-gir1.2-soup-2.4-2.74.3-6ubuntu1.5.md) | May 16, 2025 |
| Linux | gir1.2-soup-2.4 Ubuntu 24.10 (oracular) | 2.74.3-7ubuntu0.5 | [gir1.2-soup-2.4 2.74.3-7ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-gir1.2-soup-2.4-2.74.3-7ubuntu0.5.md) | Jan 16, 2026 |
| Linux | gir1.2-soup-2.4 Ubuntu 25.04 (plucky) | 2.74.3-10ubuntu0.3 | [gir1.2-soup-2.4 2.74.3-10ubuntu0.3](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-gir1.2-soup-2.4-2.74.3-10ubuntu0.3.md) | Jan 16, 2026 |
| Linux | gir1.2-soup-3.0 Ubuntu 22.04.1 LTS (jammy) | 3.0.7-0ubuntu1+esm4 | [gir1.2-soup-3.0 3.0.7-0ubuntu1+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-gir1.2-soup-3.0-3.0.7-0ubuntu1-esm4.md) | May 16, 2025 |
| Linux | gir1.2-soup-3.0 Ubuntu 24.04.5 LTS (noble) | 3.4.4-5ubuntu0.4 | [gir1.2-soup-3.0 3.4.4-5ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-gir1.2-soup-3.0-3.4.4-5ubuntu0.4.md) | May 16, 2025 |
| Linux | gir1.2-soup-3.0 Ubuntu 24.10 (oracular) | 3.6.0-2ubuntu0.4 | [gir1.2-soup-3.0 3.6.0-2ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-gir1.2-soup-3.0-3.6.0-2ubuntu0.4.md) | Jan 16, 2026 |
| Linux | gir1.2-soup-3.0 Ubuntu 25.04 (plucky) | 3.6.5-1ubuntu0.1 | [gir1.2-soup-3.0 3.6.5-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-gir1.2-soup-3.0-3.6.5-1ubuntu0.1.md) | Jan 16, 2026 |
| Linux | libsoup amzn 2023 | 2.72.0-6.amzn2023.0.8 | [ALAS2023-2025-1310](https://patchblox.com/security/data/fix/linux/alas2023-2025-1310.md) | Dec 8, 2025 |
| Linux | libsoup opensuse-leap 15.6 | 3.4.4-150600.3.10.1 | [SUSE-SU-2025:01812-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-01812-1.md) | Jun 4, 2025 |
| Linux | libsoup sles 15.6 | 3.4.4-150600.3.10.1 | [SUSE-SU-2025:01812-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-01812-1.md) | Jun 4, 2025 |
| Linux | libsoup sles 15.7 | 3.4.4-150600.3.10.1 | [SUSE-SU-2025:01812-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-01812-1.md) | Jun 4, 2025 |
| Linux | libsoup-2.4-1 Ubuntu 24.04.5 LTS (noble) | 2.74.3-6ubuntu1.5 | [libsoup-2.4-1 2.74.3-6ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libsoup-2.4-1-2.74.3-6ubuntu1.5.md) | May 16, 2025 |
| Linux | libsoup-2.4-1 Ubuntu 24.10 (oracular) | 2.74.3-7ubuntu0.5 | [libsoup-2.4-1 2.74.3-7ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libsoup-2.4-1-2.74.3-7ubuntu0.5.md) | Jan 16, 2026 |
| Linux | libsoup-2.4-1 Ubuntu 25.04 (plucky) | 2.74.3-10ubuntu0.3 | [libsoup-2.4-1 2.74.3-10ubuntu0.3](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libsoup-2.4-1-2.74.3-10ubuntu0.3.md) | Jan 16, 2026 |
| Linux | libsoup-3.0-0 Ubuntu 22.04.1 LTS (jammy) | 3.0.7-0ubuntu1+esm4 | [libsoup-3.0-0 3.0.7-0ubuntu1+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libsoup-3.0-0-3.0.7-0ubuntu1-esm4.md) | May 16, 2025 |
| Linux | libsoup-3.0-0 Ubuntu 24.04.5 LTS (noble) | 3.4.4-5ubuntu0.4 | [libsoup-3.0-0 3.4.4-5ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libsoup-3.0-0-3.4.4-5ubuntu0.4.md) | May 16, 2025 |
| Linux | libsoup-3.0-0 Ubuntu 24.10 (oracular) | 3.6.0-2ubuntu0.4 | [libsoup-3.0-0 3.6.0-2ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libsoup-3.0-0-3.6.0-2ubuntu0.4.md) | Jan 16, 2026 |
| Linux | libsoup-3.0-0 Ubuntu 25.04 (plucky) | 3.6.5-1ubuntu0.1 | [libsoup-3.0-0 3.6.5-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libsoup-3.0-0-3.6.5-1ubuntu0.1.md) | Jan 16, 2026 |
| Linux | libsoup-3.0-common Ubuntu 22.04.1 LTS (jammy) | 3.0.7-0ubuntu1+esm4 | [libsoup-3.0-common 3.0.7-0ubuntu1+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libsoup-3.0-common-3.0.7-0ubuntu1-esm4.md) | May 16, 2025 |
| Linux | libsoup-3.0-common Ubuntu 24.04.5 LTS (noble) | 3.4.4-5ubuntu0.4 | [libsoup-3.0-common 3.4.4-5ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libsoup-3.0-common-3.4.4-5ubuntu0.4.md) | May 16, 2025 |
| Linux | libsoup-3.0-common Ubuntu 24.10 (oracular) | 3.6.0-2ubuntu0.4 | [libsoup-3.0-common 3.6.0-2ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libsoup-3.0-common-3.6.0-2ubuntu0.4.md) | Jan 16, 2026 |
| Linux | libsoup-3.0-common Ubuntu 25.04 (plucky) | 3.6.5-1ubuntu0.1 | [libsoup-3.0-common 3.6.5-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libsoup-3.0-common-3.6.5-1ubuntu0.1.md) | Jan 16, 2026 |
| Linux | libsoup-3.0-tests Ubuntu 22.04.1 LTS (jammy) | 3.0.7-0ubuntu1+esm4 | [libsoup-3.0-tests 3.0.7-0ubuntu1+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libsoup-3.0-tests-3.0.7-0ubuntu1-esm4.md) | May 16, 2025 |
| Linux | libsoup-3.0-tests Ubuntu 24.04.5 LTS (noble) | 3.4.4-5ubuntu0.4 | [libsoup-3.0-tests 3.4.4-5ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libsoup-3.0-tests-3.4.4-5ubuntu0.4.md) | May 16, 2025 |
| Linux | libsoup-3.0-tests Ubuntu 24.10 (oracular) | 3.6.0-2ubuntu0.4 | [libsoup-3.0-tests 3.6.0-2ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libsoup-3.0-tests-3.6.0-2ubuntu0.4.md) | Jan 16, 2026 |
| Linux | libsoup-3.0-tests Ubuntu 25.04 (plucky) | 3.6.5-1ubuntu0.1 | [libsoup-3.0-tests 3.6.5-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libsoup-3.0-tests-3.6.5-1ubuntu0.1.md) | Jan 16, 2026 |
| Linux | libsoup-debuginfo amzn 2023 | 2.72.0-6.amzn2023.0.8 | [ALAS2023-2025-1310](https://patchblox.com/security/data/fix/linux/alas2023-2025-1310.md) | Dec 8, 2025 |
| Linux | libsoup-debugsource amzn 2023 | 2.72.0-6.amzn2023.0.8 | [ALAS2023-2025-1310](https://patchblox.com/security/data/fix/linux/alas2023-2025-1310.md) | Dec 8, 2025 |
| Linux | libsoup-devel amzn 2023 | 2.72.0-6.amzn2023.0.8 | [ALAS2023-2025-1310](https://patchblox.com/security/data/fix/linux/alas2023-2025-1310.md) | Dec 8, 2025 |
| Linux | libsoup-doc amzn 2023 | 2.72.0-6.amzn2023.0.8 | [ALAS2023-2025-1310](https://patchblox.com/security/data/fix/linux/alas2023-2025-1310.md) | Dec 8, 2025 |
| Linux | libsoup-gnome-2.4-1 Ubuntu 24.04.5 LTS (noble) | 2.74.3-6ubuntu1.5 | [libsoup-gnome-2.4-1 2.74.3-6ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libsoup-gnome-2.4-1-2.74.3-6ubuntu1.5.md) | May 16, 2025 |
| Linux | libsoup-gnome-2.4-1 Ubuntu 24.10 (oracular) | 2.74.3-7ubuntu0.5 | [libsoup-gnome-2.4-1 2.74.3-7ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libsoup-gnome-2.4-1-2.74.3-7ubuntu0.5.md) | Jan 16, 2026 |
| Linux | libsoup-gnome-2.4-1 Ubuntu 25.04 (plucky) | 2.74.3-10ubuntu0.3 | [libsoup-gnome-2.4-1 2.74.3-10ubuntu0.3](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libsoup-gnome-2.4-1-2.74.3-10ubuntu0.3.md) | Jan 16, 2026 |
| Linux | libsoup-gnome2.4-1 Ubuntu 18.04.6 LTS (bionic) | 2.62.1-1ubuntu0.4+esm4 | [libsoup-gnome2.4-1 2.62.1-1ubuntu0.4+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libsoup-gnome2.4-1-2.62.1-1ubuntu0.4-esm4.md) | May 16, 2025 |
| Linux | libsoup-gnome2.4-1 Ubuntu 20.04 LTS (focal) | 2.70.0-1ubuntu0.5 | [libsoup-gnome2.4-1 2.70.0-1ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libsoup-gnome2.4-1-2.70.0-1ubuntu0.5.md) | May 16, 2025 |
| Linux | libsoup-gnome2.4-1 Ubuntu 22.04.1 LTS (jammy) | 2.74.2-3ubuntu0.5 | [libsoup-gnome2.4-1 2.74.2-3ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libsoup-gnome2.4-1-2.74.2-3ubuntu0.5.md) | May 16, 2025 |
| Linux | libsoup2 opensuse-leap 15.6 | 2.74.3-150600.4.24.1 | [SUSE-SU-2026:0574-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0574-1.md) | Feb 18, 2026 |
| Linux | libsoup2 opensuse-leap 16.0 | 2.74.3-160000.4.1 | [OPENSUSE-SU-2026:20354-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20354-1.md) | Mar 13, 2026 |
| Linux | libsoup2 sles 15.6 | 2.74.3-150600.4.24.1 | [SUSE-SU-2026:0574-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0574-1.md) | Feb 18, 2026 |
| Linux | libsoup2 sles 15.7 | 2.74.3-150600.4.24.1 | [SUSE-SU-2026:0574-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0574-1.md) | Feb 18, 2026 |
| Linux | libsoup2.4 Debian 11.6 (bullseye) | 2.72.0-2+deb11u3 | [DLA-4398-1](https://patchblox.com/security/data/fix/linux/dla-4398-1.md) | Dec 9, 2025 |
| Linux | libsoup2.4-1 Ubuntu 18.04.6 LTS (bionic) | 2.62.1-1ubuntu0.4+esm4 | [libsoup2.4-1 2.62.1-1ubuntu0.4+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libsoup2.4-1-2.62.1-1ubuntu0.4-esm4.md) | May 16, 2025 |
| Linux | libsoup2.4-1 Ubuntu 20.04 LTS (focal) | 2.70.0-1ubuntu0.5 | [libsoup2.4-1 2.70.0-1ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libsoup2.4-1-2.70.0-1ubuntu0.5.md) | May 16, 2025 |
| Linux | libsoup2.4-1 Ubuntu 22.04.1 LTS (jammy) | 2.74.2-3ubuntu0.5 | [libsoup2.4-1 2.74.2-3ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libsoup2.4-1-2.74.2-3ubuntu0.5.md) | May 16, 2025 |
| Linux | libsoup2.4-common Ubuntu 22.04.1 LTS (jammy) | 2.74.2-3ubuntu0.5 | [libsoup2.4-common 2.74.2-3ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libsoup2.4-common-2.74.2-3ubuntu0.5.md) | May 16, 2025 |
| Linux | libsoup2.4-common Ubuntu 24.04.5 LTS (noble) | 2.74.3-6ubuntu1.5 | [libsoup2.4-common 2.74.3-6ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libsoup2.4-common-2.74.3-6ubuntu1.5.md) | May 16, 2025 |
| Linux | libsoup2.4-common Ubuntu 24.10 (oracular) | 2.74.3-7ubuntu0.5 | [libsoup2.4-common 2.74.3-7ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libsoup2.4-common-2.74.3-7ubuntu0.5.md) | Jan 16, 2026 |
| Linux | libsoup2.4-common Ubuntu 25.04 (plucky) | 2.74.3-10ubuntu0.3 | [libsoup2.4-common 2.74.3-10ubuntu0.3](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libsoup2.4-common-2.74.3-10ubuntu0.3.md) | Jan 16, 2026 |
| Linux | libsoup2.4-tests Ubuntu 20.04 LTS (focal) | 2.70.0-1ubuntu0.5 | [libsoup2.4-tests 2.70.0-1ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libsoup2.4-tests-2.70.0-1ubuntu0.5.md) | May 16, 2025 |
| Linux | libsoup2.4-tests Ubuntu 22.04.1 LTS (jammy) | 2.74.2-3ubuntu0.5 | [libsoup2.4-tests 2.74.2-3ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libsoup2.4-tests-2.74.2-3ubuntu0.5.md) | May 16, 2025 |
| Linux | libsoup2.4-tests Ubuntu 24.04.5 LTS (noble) | 2.74.3-6ubuntu1.5 | [libsoup2.4-tests 2.74.3-6ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libsoup2.4-tests-2.74.3-6ubuntu1.5.md) | May 16, 2025 |
| Linux | libsoup2.4-tests Ubuntu 24.10 (oracular) | 2.74.3-7ubuntu0.5 | [libsoup2.4-tests 2.74.3-7ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libsoup2.4-tests-2.74.3-7ubuntu0.5.md) | Jan 16, 2026 |
| Linux | libsoup2.4-tests Ubuntu 25.04 (plucky) | 2.74.3-10ubuntu0.3 | [libsoup2.4-tests 2.74.3-10ubuntu0.3](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libsoup2.4-tests-2.74.3-10ubuntu0.3.md) | Jan 16, 2026 |
| Linux | libsoup3 Debian 13.5 (trixie) | 3.6.5-2 | [DEBIAN-CVE-2025-4476](https://patchblox.com/security/data/fix/linux/debian-cve-2025-4476.md) | May 16, 2025 |
| Linux | libsoup3 amzn 2023 | 3.6.5-52.amzn2023 | [ALAS2023-2025-1233](https://patchblox.com/security/data/fix/linux/alas2023-2025-1233.md) | Oct 27, 2025 |
| Linux | libsoup3-debuginfo amzn 2023 | 3.6.5-52.amzn2023 | [ALAS2023-2025-1233](https://patchblox.com/security/data/fix/linux/alas2023-2025-1233.md) | Oct 27, 2025 |
| Linux | libsoup3-debugsource amzn 2023 | 3.6.5-52.amzn2023 | [ALAS2023-2025-1233](https://patchblox.com/security/data/fix/linux/alas2023-2025-1233.md) | Oct 27, 2025 |
| Linux | libsoup3-devel amzn 2023 | 3.6.5-52.amzn2023 | [ALAS2023-2025-1233](https://patchblox.com/security/data/fix/linux/alas2023-2025-1233.md) | Oct 27, 2025 |
| Linux | libsoup3-doc amzn 2023 | 3.6.5-52.amzn2023 | [ALAS2023-2025-1233](https://patchblox.com/security/data/fix/linux/alas2023-2025-1233.md) | Oct 27, 2025 |

---

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