# CVE-2025-4373: Glib: buffer underflow on glib through glib/gstring.c via function g_string_insert_unichar

CVE-2025-4373 is fixed in 17 products on 1 platform, first by RHSA-2025:10855, released May 6, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-4373
- Priority: High
- CVSS: 7.0 (Medium)
- EPSS: 0.0065
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 6, 2025
- Weakness: Buffer Underwrite ('Buffer Underflow')
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-4373

## Description

A flaw was found in GLib, which is vulnerable to an integer overflow in theg_string_insert_unichar() function. When the position at which to insertthe character is large, the position will overflow, leading to a bufferunderwrite.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | gir1.2-girepository-3.0 Ubuntu 24.04.5 LTS (noble) | 2.80.0-6ubuntu3.4 | [gir1.2-girepository-3.0 2.80.0-6ubuntu3.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-gir1.2-girepository-3.0-2.80.0-6ubuntu3.4.md) | May 6, 2025 |
| Linux | gir1.2-girepository-3.0 Ubuntu 24.10 (oracular) | 2.82.1-0ubuntu1.1 | [gir1.2-girepository-3.0 2.82.1-0ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-gir1.2-girepository-3.0-2.82.1-0ubuntu1.1.md) | Jan 16, 2026 |
| Linux | gir1.2-girepository-3.0 Ubuntu 25.04 (plucky) | 2.84.1-1ubuntu0.1 | [gir1.2-girepository-3.0 2.84.1-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-gir1.2-girepository-3.0-2.84.1-1ubuntu0.1.md) | Jan 16, 2026 |
| Linux | gir1.2-glib-2.0 Ubuntu 24.04.5 LTS (noble) | 2.80.0-6ubuntu3.4 | [gir1.2-glib-2.0 2.80.0-6ubuntu3.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-gir1.2-glib-2.0-2.80.0-6ubuntu3.4.md) | May 6, 2025 |
| Linux | gir1.2-glib-2.0 Ubuntu 24.10 (oracular) | 2.82.1-0ubuntu1.1 | [gir1.2-glib-2.0 2.82.1-0ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-gir1.2-glib-2.0-2.82.1-0ubuntu1.1.md) | Jan 16, 2026 |
| Linux | gir1.2-glib-2.0 Ubuntu 25.04 (plucky) | 2.84.1-1ubuntu0.1 | [gir1.2-glib-2.0 2.84.1-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-gir1.2-glib-2.0-2.84.1-1ubuntu0.1.md) | Jan 16, 2026 |
| Linux | girepository-tools Ubuntu 25.04 (plucky) | 2.84.1-1ubuntu0.1 | [girepository-tools 2.84.1-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-girepository-tools-2.84.1-1ubuntu0.1.md) | Jan 16, 2026 |
| Linux | glib2 RHEL 10 | 2.80.4-4.el10_0.6 | [RHSA-2025:10855](https://patchblox.com/security/data/fix/linux/rhsa-2025-10855.md) | May 6, 2025 |
| Linux | glib2 RHEL 8 | 0:2.56.4-166.el8_10 | [RHSA-2025:11327](https://patchblox.com/security/data/fix/linux/rhsa-2025-11327.md) | Jul 16, 2025 |
| Linux | glib2 RHEL 9 | 0:2.68.4-16.el9_6.2 | [RHSA-2025:11140](https://patchblox.com/security/data/fix/linux/rhsa-2025-11140.md) | Jul 15, 2025 |
| Linux | glib2 almalinux 8 | 2.56.4-166.el8_10 | [ALSA-2025:11327](https://patchblox.com/security/data/fix/linux/alsa-2025-11327.md) | Jul 16, 2025 |
| Linux | glib2 almalinux 9 | 2.68.4-16.el9_6.2 | [ALSA-2025:11140](https://patchblox.com/security/data/fix/linux/alsa-2025-11140.md) | Jul 15, 2025 |
| Linux | glib2 ol 10 | 0:2.80.4-4.el10_0.6 | [ELSA-2025-10855](https://patchblox.com/security/data/fix/linux/elsa-2025-10855.md) | Jul 16, 2025 |
| Linux | glib2 ol 8 | 0:2.56.4-166.el8_10 | [ELSA-2025-11327](https://patchblox.com/security/data/fix/linux/elsa-2025-11327.md) | Jul 16, 2025 |
| Linux | glib2 ol 9 | 0:2.68.4-16.el9_6.2 | [ELSA-2025-11140](https://patchblox.com/security/data/fix/linux/elsa-2025-11140.md) | Jul 15, 2025 |
| Linux | glib2 opensuse-leap 15.6 | 2.78.6-150600.4.16.1 | [SUSE-SU-2025:02167-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-02167-1.md) | Jun 30, 2025 |
| Linux | glib2 rocky 10 | 0:2.80.4-4.el10_0.6 | [RLSA-2025:10855](https://patchblox.com/security/data/fix/linux/rlsa-2025-10855.md) | Oct 3, 2025 |
| Linux | glib2 rocky 8 | 0:2.56.4-166.el8_10 | [RLSA-2025:11327](https://patchblox.com/security/data/fix/linux/rlsa-2025-11327.md) | Jul 29, 2025 |
| Linux | glib2 rocky 9 | 0:2.68.4-16.el9_6.2 | [RLSA-2025:11140](https://patchblox.com/security/data/fix/linux/rlsa-2025-11140.md) | Oct 4, 2025 |
| Linux | glib2 sles 15.6 | 2.78.6-150600.4.16.1 | [SUSE-SU-2025:02167-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-02167-1.md) | Jun 30, 2025 |
| Linux | glib2 sles 15.7 | 2.78.6-150600.4.16.1 | [SUSE-SU-2025:02167-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-02167-1.md) | Jun 30, 2025 |
| Linux | glib2-devel RHEL 8 | 0:2.56.4-166.el8_10 | [RHSA-2025:11327](https://patchblox.com/security/data/fix/linux/rhsa-2025-11327.md) | Jul 16, 2025 |
| Linux | glib2-devel RHEL 9 | 0:2.68.4-16.el9_6.2 | [RHSA-2025:11140](https://patchblox.com/security/data/fix/linux/rhsa-2025-11140.md) | Jul 15, 2025 |
| Linux | glib2-devel almalinux 8 | 2.56.4-166.el8_10 | [ALSA-2025:11327](https://patchblox.com/security/data/fix/linux/alsa-2025-11327.md) | Jul 16, 2025 |
| Linux | glib2-devel almalinux 9 | 2.68.4-16.el9_6.2 | [ALSA-2025:11140](https://patchblox.com/security/data/fix/linux/alsa-2025-11140.md) | Jul 15, 2025 |
| Linux | glib2-devel ol 10 | 0:2.80.4-4.el10_0.6 | [ELSA-2025-10855](https://patchblox.com/security/data/fix/linux/elsa-2025-10855.md) | Jul 16, 2025 |
| Linux | glib2-devel ol 8 | 0:2.56.4-166.el8_10 | [ELSA-2025-11327](https://patchblox.com/security/data/fix/linux/elsa-2025-11327.md) | Jul 16, 2025 |
| Linux | glib2-devel ol 9 | 0:2.68.4-16.el9_6.2 | [ELSA-2025-11140](https://patchblox.com/security/data/fix/linux/elsa-2025-11140.md) | Jul 15, 2025 |
| Linux | glib2-doc RHEL 8 | 0:2.56.4-166.el8_10 | [RHSA-2025:11327](https://patchblox.com/security/data/fix/linux/rhsa-2025-11327.md) | Jul 16, 2025 |
| Linux | glib2-doc RHEL 9 | 0:2.68.4-16.el9_6.2 | [RHSA-2025:11140](https://patchblox.com/security/data/fix/linux/rhsa-2025-11140.md) | Jul 15, 2025 |
| Linux | glib2-doc almalinux 8 | 2.56.4-166.el8_10 | [ALSA-2025:11327](https://patchblox.com/security/data/fix/linux/alsa-2025-11327.md) | Jul 16, 2025 |
| Linux | glib2-doc almalinux 9 | 2.68.4-16.el9_6.2 | [ALSA-2025:11140](https://patchblox.com/security/data/fix/linux/alsa-2025-11140.md) | Jul 15, 2025 |
| Linux | glib2-doc ol 10 | 0:2.80.4-4.el10_0.6 | [ELSA-2025-10855](https://patchblox.com/security/data/fix/linux/elsa-2025-10855.md) | Jul 16, 2025 |
| Linux | glib2-doc ol 8 | 0:2.56.4-166.el8_10 | [ELSA-2025-11327](https://patchblox.com/security/data/fix/linux/elsa-2025-11327.md) | Jul 16, 2025 |
| Linux | glib2-doc ol 9 | 0:2.68.4-16.el9_6.2 | [ELSA-2025-11140](https://patchblox.com/security/data/fix/linux/elsa-2025-11140.md) | Jul 15, 2025 |
| Linux | glib2-doc opensuse-leap 15.6 | 2.78.6-150600.4.16.1 | [SUSE-SU-2025:02167-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-02167-1.md) | Jun 30, 2025 |
| Linux | glib2-fam RHEL 8 | 0:2.56.4-166.el8_10 | [RHSA-2025:11327](https://patchblox.com/security/data/fix/linux/rhsa-2025-11327.md) | Jul 16, 2025 |
| Linux | glib2-fam almalinux 8 | 2.56.4-166.el8_10 | [ALSA-2025:11327](https://patchblox.com/security/data/fix/linux/alsa-2025-11327.md) | Jul 16, 2025 |
| Linux | glib2-fam ol 8 | 0:2.56.4-166.el8_10 | [ELSA-2025-11327](https://patchblox.com/security/data/fix/linux/elsa-2025-11327.md) | Jul 16, 2025 |
| Linux | glib2-static RHEL 8 | 0:2.56.4-166.el8_10 | [RHSA-2025:11327](https://patchblox.com/security/data/fix/linux/rhsa-2025-11327.md) | Jul 16, 2025 |
| Linux | glib2-static RHEL 9 | 0:2.68.4-16.el9_6.2 | [RHSA-2025:11140](https://patchblox.com/security/data/fix/linux/rhsa-2025-11140.md) | Jul 15, 2025 |
| Linux | glib2-static almalinux 8 | 2.56.4-166.el8_10 | [ALSA-2025:11327](https://patchblox.com/security/data/fix/linux/alsa-2025-11327.md) | Jul 16, 2025 |
| Linux | glib2-static almalinux 9 | 2.68.4-16.el9_6.2 | [ALSA-2025:11140](https://patchblox.com/security/data/fix/linux/alsa-2025-11140.md) | Jul 15, 2025 |
| Linux | glib2-static ol 10 | 0:2.80.4-4.el10_0.6 | [ELSA-2025-10855](https://patchblox.com/security/data/fix/linux/elsa-2025-10855.md) | Jul 16, 2025 |
| Linux | glib2-static ol 8 | 0:2.56.4-166.el8_10 | [ELSA-2025-11327](https://patchblox.com/security/data/fix/linux/elsa-2025-11327.md) | Jul 16, 2025 |
| Linux | glib2-static ol 9 | 0:2.68.4-16.el9_6.2 | [ELSA-2025-11140](https://patchblox.com/security/data/fix/linux/elsa-2025-11140.md) | Jul 15, 2025 |
| Linux | glib2-tests RHEL 8 | 0:2.56.4-166.el8_10 | [RHSA-2025:11327](https://patchblox.com/security/data/fix/linux/rhsa-2025-11327.md) | Jul 16, 2025 |
| Linux | glib2-tests RHEL 9 | 0:2.68.4-16.el9_6.2 | [RHSA-2025:11140](https://patchblox.com/security/data/fix/linux/rhsa-2025-11140.md) | Jul 15, 2025 |
| Linux | glib2-tests almalinux 8 | 2.56.4-166.el8_10 | [ALSA-2025:11327](https://patchblox.com/security/data/fix/linux/alsa-2025-11327.md) | Jul 16, 2025 |
| Linux | glib2-tests almalinux 9 | 2.68.4-16.el9_6.2 | [ALSA-2025:11140](https://patchblox.com/security/data/fix/linux/alsa-2025-11140.md) | Jul 15, 2025 |
| Linux | glib2-tests ol 10 | 0:2.80.4-4.el10_0.6 | [ELSA-2025-10855](https://patchblox.com/security/data/fix/linux/elsa-2025-10855.md) | Jul 16, 2025 |
| Linux | glib2-tests ol 8 | 0:2.56.4-166.el8_10 | [ELSA-2025-11327](https://patchblox.com/security/data/fix/linux/elsa-2025-11327.md) | Jul 16, 2025 |
| Linux | glib2-tests ol 9 | 0:2.68.4-16.el9_6.2 | [ELSA-2025-11140](https://patchblox.com/security/data/fix/linux/elsa-2025-11140.md) | Jul 15, 2025 |
| Linux | glib2.0 Debian 12.15 (bookworm) | 2.74.6-2+deb12u7 | [DEBIAN-CVE-2025-4373](https://patchblox.com/security/data/fix/linux/debian-cve-2025-4373.md) | May 6, 2025 |
| Linux | glib2.0 Debian 13.5 (trixie) | 2.84.1-3 | [DEBIAN-CVE-2025-4373](https://patchblox.com/security/data/fix/linux/debian-cve-2025-4373.md) | May 6, 2025 |
| Linux | glib2.0 Debian 14 | 2.84.1-3 | [DEBIAN-CVE-2025-4373](https://patchblox.com/security/data/fix/linux/debian-cve-2025-4373.md) | May 6, 2025 |
| Linux | libgirepository-2.0-0 Ubuntu 24.04.5 LTS (noble) | 2.80.0-6ubuntu3.4 | [libgirepository-2.0-0 2.80.0-6ubuntu3.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libgirepository-2.0-0-2.80.0-6ubuntu3.4.md) | May 6, 2025 |
| Linux | libgirepository-2.0-0 Ubuntu 24.10 (oracular) | 2.82.1-0ubuntu1.1 | [libgirepository-2.0-0 2.82.1-0ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libgirepository-2.0-0-2.82.1-0ubuntu1.1.md) | Jan 16, 2026 |
| Linux | libgirepository-2.0-0 Ubuntu 25.04 (plucky) | 2.84.1-1ubuntu0.1 | [libgirepository-2.0-0 2.84.1-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libgirepository-2.0-0-2.84.1-1ubuntu0.1.md) | Jan 16, 2026 |
| Linux | libglib2.0-0 Ubuntu 20.04 LTS (focal) | 2.64.6-1~ubuntu20.04.9 | [libglib2.0-0 2.64.6-1~ubuntu20.04.9](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libglib2.0-0-2.64.6-1-ubuntu20.04.9.md) | May 6, 2025 |
| Linux | libglib2.0-0 Ubuntu 22.04.1 LTS (jammy) | 2.72.4-0ubuntu2.5 | [libglib2.0-0 2.72.4-0ubuntu2.5](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libglib2.0-0-2.72.4-0ubuntu2.5.md) | May 6, 2025 |
| Linux | libglib2.0-0t64 Ubuntu 24.04.5 LTS (noble) | 2.80.0-6ubuntu3.4 | [libglib2.0-0t64 2.80.0-6ubuntu3.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libglib2.0-0t64-2.80.0-6ubuntu3.4.md) | May 6, 2025 |
| Linux | libglib2.0-0t64 Ubuntu 24.10 (oracular) | 2.82.1-0ubuntu1.1 | [libglib2.0-0t64 2.82.1-0ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libglib2.0-0t64-2.82.1-0ubuntu1.1.md) | Jan 16, 2026 |
| Linux | libglib2.0-0t64 Ubuntu 25.04 (plucky) | 2.84.1-1ubuntu0.1 | [libglib2.0-0t64 2.84.1-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libglib2.0-0t64-2.84.1-1ubuntu0.1.md) | Jan 16, 2026 |
| Linux | libglib2.0-bin Ubuntu 20.04 LTS (focal) | 2.64.6-1~ubuntu20.04.9 | [libglib2.0-bin 2.64.6-1~ubuntu20.04.9](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libglib2.0-bin-2.64.6-1-ubuntu20.04.9.md) | May 6, 2025 |
| Linux | libglib2.0-bin Ubuntu 22.04.1 LTS (jammy) | 2.72.4-0ubuntu2.5 | [libglib2.0-bin 2.72.4-0ubuntu2.5](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libglib2.0-bin-2.72.4-0ubuntu2.5.md) | May 6, 2025 |
| Linux | libglib2.0-bin Ubuntu 24.04.5 LTS (noble) | 2.80.0-6ubuntu3.4 | [libglib2.0-bin 2.80.0-6ubuntu3.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libglib2.0-bin-2.80.0-6ubuntu3.4.md) | May 6, 2025 |
| Linux | libglib2.0-bin Ubuntu 24.10 (oracular) | 2.82.1-0ubuntu1.1 | [libglib2.0-bin 2.82.1-0ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libglib2.0-bin-2.82.1-0ubuntu1.1.md) | Jan 16, 2026 |
| Linux | libglib2.0-bin Ubuntu 25.04 (plucky) | 2.84.1-1ubuntu0.1 | [libglib2.0-bin 2.84.1-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libglib2.0-bin-2.84.1-1ubuntu0.1.md) | Jan 16, 2026 |
| Linux | libglib2.0-data Ubuntu 20.04 LTS (focal) | 2.64.6-1~ubuntu20.04.9 | [libglib2.0-data 2.64.6-1~ubuntu20.04.9](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libglib2.0-data-2.64.6-1-ubuntu20.04.9.md) | May 6, 2025 |
| Linux | libglib2.0-data Ubuntu 22.04.1 LTS (jammy) | 2.72.4-0ubuntu2.5 | [libglib2.0-data 2.72.4-0ubuntu2.5](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libglib2.0-data-2.72.4-0ubuntu2.5.md) | May 6, 2025 |
| Linux | libglib2.0-data Ubuntu 24.04.5 LTS (noble) | 2.80.0-6ubuntu3.4 | [libglib2.0-data 2.80.0-6ubuntu3.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libglib2.0-data-2.80.0-6ubuntu3.4.md) | May 6, 2025 |
| Linux | libglib2.0-data Ubuntu 24.10 (oracular) | 2.82.1-0ubuntu1.1 | [libglib2.0-data 2.82.1-0ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libglib2.0-data-2.82.1-0ubuntu1.1.md) | Jan 16, 2026 |
| Linux | libglib2.0-data Ubuntu 25.04 (plucky) | 2.84.1-1ubuntu0.1 | [libglib2.0-data 2.84.1-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libglib2.0-data-2.84.1-1ubuntu0.1.md) | Jan 16, 2026 |
| Linux | libglib2.0-dev-bin Ubuntu 20.04 LTS (focal) | 2.64.6-1~ubuntu20.04.9 | [libglib2.0-dev-bin 2.64.6-1~ubuntu20.04.9](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libglib2.0-dev-bin-2.64.6-1-ubuntu20.04.9.md) | May 6, 2025 |
| Linux | libglib2.0-dev-bin Ubuntu 22.04.1 LTS (jammy) | 2.72.4-0ubuntu2.5 | [libglib2.0-dev-bin 2.72.4-0ubuntu2.5](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libglib2.0-dev-bin-2.72.4-0ubuntu2.5.md) | May 6, 2025 |
| Linux | libglib2.0-dev-bin Ubuntu 24.04.5 LTS (noble) | 2.80.0-6ubuntu3.4 | [libglib2.0-dev-bin 2.80.0-6ubuntu3.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libglib2.0-dev-bin-2.80.0-6ubuntu3.4.md) | May 6, 2025 |
| Linux | libglib2.0-tests Ubuntu 20.04 LTS (focal) | 2.64.6-1~ubuntu20.04.9 | [libglib2.0-tests 2.64.6-1~ubuntu20.04.9](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libglib2.0-tests-2.64.6-1-ubuntu20.04.9.md) | May 6, 2025 |
| Linux | libglib2.0-tests Ubuntu 22.04.1 LTS (jammy) | 2.72.4-0ubuntu2.5 | [libglib2.0-tests 2.72.4-0ubuntu2.5](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libglib2.0-tests-2.72.4-0ubuntu2.5.md) | May 6, 2025 |
| Linux | libglib2.0-tests Ubuntu 24.04.5 LTS (noble) | 2.80.0-6ubuntu3.4 | [libglib2.0-tests 2.80.0-6ubuntu3.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libglib2.0-tests-2.80.0-6ubuntu3.4.md) | May 6, 2025 |
| Linux | libglib2.0-tests Ubuntu 24.10 (oracular) | 2.82.1-0ubuntu1.1 | [libglib2.0-tests 2.82.1-0ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libglib2.0-tests-2.82.1-0ubuntu1.1.md) | Jan 16, 2026 |
| Linux | libglib2.0-tests Ubuntu 25.04 (plucky) | 2.84.1-1ubuntu0.1 | [libglib2.0-tests 2.84.1-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libglib2.0-tests-2.84.1-1ubuntu0.1.md) | Jan 16, 2026 |

---

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