expat: In libexpat before 2.7.4, the doContent function does not properly determine the buffer size bufSize because there is...
CVE-2026-25210 is fixed in 11 products on 1 platform, first by expat 2.2.5-3ubuntu0.9+esm3, released January 29, 2026. It is not reported as exploited. Patch Radar priority: High.
In libexpat before 2.7.4, the doContent function does not properly determine the buffer size bufSize because there is no integer overflow check for tag buffer reallocation.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| expat · Debian 12.15 (bookworm) | 2.5.0-1+deb12u4 | DEBIAN-CVE-2026-25210 | Jan 30, 2026 |
| expat · Debian 13.5 (trixie) | 2.8.2-1~deb13u1 | DEBIAN-CVE-2026-25210 | Jan 30, 2026 |
| expat · Debian 14 | 2.7.4-1 | DEBIAN-CVE-2026-25210 | Jan 30, 2026 |
| expat · Ubuntu 18.04.6 LTS (bionic) | 2.2.5-3ubuntu0.9+esm3 | expat 2.2.5-3ubuntu0.9+esm3 | Jan 29, 2026 |
| expat · Ubuntu 20.04 LTS (focal) | 2.2.9-1ubuntu0.8+esm1 | expat 2.2.9-1ubuntu0.8+esm1 | Jan 29, 2026 |
| expat · Ubuntu 22.04.1 LTS (jammy) | 2.4.7-1ubuntu0.7 | expat 2.4.7-1ubuntu0.7 | Jan 29, 2026 |
| expat · Ubuntu 24.04.5 LTS (noble) | 2.6.1-2ubuntu0.4 | expat 2.6.1-2ubuntu0.4 | Jan 29, 2026 |
| expat · Ubuntu 25.10 (questing) | 2.7.1-2ubuntu0.2 | expat 2.7.1-2ubuntu0.2 | Jan 29, 2026 |
| expat · amzn 2023 | 2.6.3-1.amzn2023.0.4 | ALAS2023-2026-1425 | Feb 16, 2026 |
| expat · opensuse-leap 15.6 | 2.7.1-150400.3.34.1 | SUSE-SU-2026:0826-1 | Mar 5, 2026 |
| expat · opensuse-leap 16.0 | 2.7.1-160000.4.1 | OPENSUSE-SU-2026:20306-1 | Mar 3, 2026 |
| expat · sles 15.6 | 2.8.5-150400.3.40.1 | SUSE-SU-2026:4623-1 | Nov 7, 2026 |
| expat · sles 15.7 | 2.8.5-150700.3.15.1 | SUSE-SU-2026:4619-1 | Nov 7, 2026 |
| expat · sles 16.0 | 2.7.1-160000.4.1 | SUSE-SU-2026:20627-1 | Mar 3, 2026 |
| expat-debuginfo · amzn 2023 | 2.6.3-1.amzn2023.0.4 | ALAS2023-2026-1425 | Feb 16, 2026 |
| expat-debugsource · amzn 2023 | 2.6.3-1.amzn2023.0.4 | ALAS2023-2026-1425 | Feb 16, 2026 |
| expat-devel · amzn 2023 | 2.6.3-1.amzn2023.0.4 | ALAS2023-2026-1425 | Feb 16, 2026 |
| expat-static · amzn 2023 | 2.6.3-1.amzn2023.0.4 | ALAS2023-2026-1425 | Feb 16, 2026 |
| firefox · amzn 2023 | 140.7.0-1.amzn2023.0.2 | ALAS2023-2026-1424 | Feb 16, 2026 |
| firefox-debuginfo · amzn 2023 | 140.7.0-1.amzn2023.0.2 | ALAS2023-2026-1424 | Feb 16, 2026 |
| firefox-debugsource · amzn 2023 | 140.7.0-1.amzn2023.0.2 | ALAS2023-2026-1424 | Feb 16, 2026 |
| libexpat1 · Ubuntu 18.04.6 LTS (bionic) | 2.2.5-3ubuntu0.9+esm3 | libexpat1 2.2.5-3ubuntu0.9+esm3 | Jan 29, 2026 |
| libexpat1 · Ubuntu 20.04 LTS (focal) | 2.2.9-1ubuntu0.8+esm1 | libexpat1 2.2.9-1ubuntu0.8+esm1 | Jan 29, 2026 |
| libexpat1 · Ubuntu 22.04.1 LTS (jammy) | 2.4.7-1ubuntu0.7 | libexpat1 2.4.7-1ubuntu0.7 | Jan 29, 2026 |
| libexpat1 · Ubuntu 24.04.5 LTS (noble) | 2.6.1-2ubuntu0.4 | libexpat1 2.6.1-2ubuntu0.4 | Jan 29, 2026 |
| libexpat1 · Ubuntu 25.10 (questing) | 2.7.1-2ubuntu0.2 | libexpat1 2.7.1-2ubuntu0.2 | Jan 29, 2026 |
| libxmltok1 · Ubuntu 18.04.6 LTS (bionic) | 1.2-4ubuntu0.18.04.1~esm6 | libxmltok1 1.2-4ubuntu0.18.04.1~esm6 | Jan 29, 2026 |
| libxmltok1 · Ubuntu 20.04 LTS (focal) | 1.2-4ubuntu0.20.04.1~esm6 | libxmltok1 1.2-4ubuntu0.20.04.1~esm6 | Jan 29, 2026 |
| libxmltok1 · Ubuntu 22.04.1 LTS (jammy) | 1.2-4ubuntu0.22.04.1~esm6 | libxmltok1 1.2-4ubuntu0.22.04.1~esm6 | Jan 29, 2026 |
| libxmltok1t64 · Ubuntu 24.04.5 LTS (noble) | 1.2-4.1ubuntu2.24.0.4.1+esm4 | libxmltok1t64 1.2-4.1ubuntu2.24.0.4.1+esm4 | Jan 29, 2026 |
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