libexpat 2.10.0 fixes four vulnerabilities
libexpat 2.10.0 releases fixes for CVE-2026-113351, CVE-2026-115506, CVE-2026-117610 and CVE-2026-118370.
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CVE-2026-118370
Integer overflow in libexpat storeAtts() through 2.9.0
- CVSS 4.0
- 8.2 high
- EPSS
- —
- Published
- ·
- Modified
AI analysisSummaries by Vani AI
libexpat through 2.9.0 has a signed integer overflow in storeAtts() in lib/xmlparse.c. A remote attacker, without privileges or user interaction, can send a multi-gigabyte document whose start tag has more than 2^30 attributes, overflowing attIndex and nPrefixes and causing out-of-bounds writes. That can crash the application or corrupt heap memory. Software that parses such XML with these libexpat versions is affected.
What to do: No fixed release is identified for libexpat through 2.9.0. No vendor workaround is stated.
| Product | Affected |
|---|---|
| libexpat project libexpat | through 2.9.0 |
Estimated exposure
No basis for an estimate.
Order-of-magnitude estimate by the model from install counts, market share and public scan data it knows; verify before quoting.
Description · NVD
libexpat through 2.9.0 contains a signed integer overflow vulnerability in storeAtts() in lib/xmlparse.c that allows attackers to trigger out-of-bounds writes via oversized attribute counts. Attackers can supply a multi-gigabyte document with a start tag carrying over 2^30 attributes to overflow attIndex and nPrefixes, crashing applications or corrupting heap memory.
- Vendors
- libexpat project
- Products
- libexpat
- Weakness
- CWE-190
- Vector
- CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
In the news
2 storiesExpat 2.10.0 released with four security fixes
Fixes DoS vulnerabilities including billion laughs attacks and integer overflow issues
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