CVE-2026-115506
High
Description
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.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Libexpat
PublishedOct 22, 2026
First seenOct 22, 2026
Weakness typeCWE-776CWE-776
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| libexpat_project libexpat | v ≤ 2.9.0 | — |
| microsoft azl3_expat_2.8.3-2 | No range specified | — |
| microsoft azl3_expat_2.9.0-1 | No range specified | — |
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