Linux · 
Ubuntu · Package update · January 16, 2026
Ubuntu · Package update · January 16, 2026libexpat1 2.4.3-1: libexpat1 2.4.3-1 for Ubuntu 25.04 (plucky)
libexpat1 2.4.3-1, released January 16, 2026, fixes 8 CVEs in libexpat1. None of them is reported as exploited. Patch Radar priority: High. The product is no longer supported.
HighUnsupported product
CVEs closed
8
None rated Critical
Exploited
0
None reported
Highest CVSS
9.8
Base score, 0 to 10
Highest EPSS
0.0548
92nd percentile
Priority of the 8 CVEs
Patch now 0
Urgent 0
High 8
Routine 0
Fixed package versions
| Product | Release | Fixed in |
|---|---|---|
| libexpat1 | Ubuntu 25.04 (plucky) | 2.4.3-1 |
CVEs this fix closes
| Priority | CVE | Title | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|
| High | CVE-2022-22822 | xul-ext-lightning: addBinding in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow. | 9.8 | 0.0548 | None reported |
| High | CVE-2021-45960 | expat: In Expat (aka libexpat) before 2.4.3, a left shift by 29 (or more) placesin the storeAtts function in xmlparse.c can... | 9.8 | 0.0467 | None reported |
| High | CVE-2021-46143 | expat: In doProlog in xmlparse.c in Expat (aka libexpat) before 2.4.3, an integeroverflow exists for m_groupSize. | 9.8 | 0.0447 | None reported |
| High | CVE-2022-22823 | thunderbird-mozsymbols: build_model in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow. | 9.8 | 0.0387 | None reported |
| High | CVE-2022-22824 | expat: defineAttribute in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow. | 9.8 | 0.0387 | None reported |
| High | CVE-2022-22826 | libxmltok1: nextScaffoldPart in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow. | 9.8 | 0.0318 | None reported |
| High | CVE-2022-22827 | thunderbird-gnome-support: storeAtts in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow. | 9.8 | 0.0318 | None reported |
| High | CVE-2022-22825 | libxmltok1: lookup in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow. | 9.8 | 0.0299 | None reported |
Showing 1 to 8 of 8
1
Patch Radar data is free to use with attribution. Terms and how to credit it.
Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.