CVE-2026-115506 – libexpat through 2.9.0 Denial of Service via Billion Laughs Detection Delay

​CVE ID :CVE-2026-115506

Published : Oct. 22, 2026, 8:17 p.m. | 1 hour, 28 minutes ago

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.

Severity: 8.7 | HIGH

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