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CVE-2026-56412

MEDIUM
5.9
CVSS Score
Published: June 21, 2026 at 03:58 PM UTC
Updated: October 25, 2026 at 11:10 PM UTC
1 product affected across 1 vendorLibexpat

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Severity
MEDIUM5.9
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

libexpat before 2.8.2 does not consider XML_TOK_DATA_CHARS in doCdataSection and thus lacks handler call depth tracking for various calls from within handlers in cases of a policy violation. Thus, a use-after-free can occur. NOTE: this issue exists because of an incomplete fix for CVE-2026-50219.

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

References (1)

PatchIssue Tracking
Source: cverecord
https://github.com/libexpat/libexpat/pull/1278

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

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

CVSS

5.9MEDIUM[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
LOW
Vector?

Quick Info

StatusANALYZED
CWE
CWE-416

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