Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/hannob/lololol
- https://github.com/libexpat/libexpat
- https://github.com/libexpat/libexpat/issues/1160
- https://github.com/libexpat/libexpat/pull/1433
- https://www.vulncheck.com/advisories/libexpat-through-2.9.0-denial-of-service-vi
FAQ
What is CVE-2026-115506?
CVE-2026-115506 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 supp...
How severe is CVE-2026-115506?
CVE-2026-115506 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-115506?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.