CVE-2026-56131

MEDIUM

4.9

CVSS Score

Published: June 19, 2026 at 02:56 AM UTC

Updated: October 26, 2026 at 11:10 AM UTC

1 product affected across 1 vendorLibexpat

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Severity

MEDIUM4.9

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

Description

libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_ResumeParser from within handlers in cases of a policy violation. Thus, a use-after-free can occur (similar to the CVE-2026-50219 situation).

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Libexpat · Libexpat Project

95%

v < 2.8.2

Affected range stops below 2.8.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://github.com/libexpat/libexpat/pull/1267

References (1)

Patch

Source: cverecord

https://github.com/libexpat/libexpat/pull/1267

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.9MEDIUMmitre

Attack Vector: LOCAL
Complexity: HIGH
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: LOW
Integrity: LOW
Availability: LOW

Vector?

Quick Info

StatusANALYZED

CWE

CWE-416

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