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CVE-2026-115506

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.

Published Oct 22, 2026libexpat_projectCWE-776EPSS 0.46%

Overview

CVE-2026-115506 is a high-severity vulnerability affecting libexpat_project libexpat. It was published on October 22, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from libexpat_project. Update libexpat to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
libexpat_projectlibexpat0Affected

References

GitHubgithub.com/hannob/lolololGitHubgithub.com/libexpat/libexpatGitHubgithub.com/libexpat/libexpat/issues/1160GitHubgithub.com/libexpat/libexpat/pull/1433Refwww.vulncheck.com/advisories/libexpat-through-2.9.0-denial-of-service-via-billion-laughs-detection-delay

How CyberStrike helps

Frequently asked questions

What is CVE-2026-115506?

CVE-2026-115506 is a high-severity vulnerability affecting libexpat_project libexpat. It was published on October 22, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-115506?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-115506?

Check the references section for vendor advisories and patches from libexpat_project. Update libexpat to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-115506?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-115506 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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