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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Vulnerability1 · 1 read
CVE-2026-115506
Billion laughs DoS in libexpat through 2.9.0
- CVSS 4.0
- 8.7 high
- EPSS
- —
- Published
- ·
- Modified
AI analysisSummaries by Vani AI
libexpat through 2.9.0 detects entity amplification too late in accountingDiffTolerated() in xmlparse.c, so billion laughs protection fails. A remote attacker with no privileges and no user interaction can send a moderately sized XML document with a large DTD and nested entity expansions. Each parse can consume tens of seconds of CPU, denying service. Software that parses untrusted XML with this library is affected.
What to do: Apply the libexpat update for CVE-2026-115506. No fixed version or workaround is stated.
| Product | Affected |
|---|---|
| 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 denial of service vulnerability because billion laughs protection in accountingDiffTolerated() in xmlparse.c detects entity amplification too late. Attackers can supply a moderately sized XML document with a large DTD and nested entity expansions to consume tens of seconds of CPU per parse.
- Vendors
- libexpat project
- Products
- libexpat
- Weakness
- CWE-776
- Vector
- CVSS:4.0/AV:N/AC:L/AT:N/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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