Linux · 
Ubuntu · Package update · January 16, 2026
Ubuntu · Package update · January 16, 2026expat 2.4.3-1: expat 2.4.3-1 for Ubuntu 25.04 (plucky)
expat 2.4.3-1, released January 16, 2026, fixes 8 CVEs in expat. 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 |
|---|---|---|
| expat | 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 |
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