vulntracker.iovulntracker.io
© 2026 vulntracker.io

CVE-2026-76957

HIGH
7.8
CVSS Score
Published: August 20, 2026 at 04:28 AM UTC
Updated: September 8, 2026 at 09:09 PM UTC
1 product affected across 1 vendorLibexpat

Using libexpat by libexpat project?

Get instant alerts when new vulnerabilities affect libexpat - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Start FreeSign In
Severity
HIGH7.8
Exploit prediction
EPSS 0.1%
SSVC
No known exploit

Description

libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks. Thus, a use-after-free can occur. NOTE: this is similar to CVE-2026-50219, CVE-2026-56131 and CVE-2026-56412.

Affected

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

Libexpat· Libexpat Project
95%
v < 2.8.4
Affected range stops below 2.8.4, 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 (2)

Issue TrackingPatchVendor Advisory
Source: cverecord
https://github.com/libexpat/libexpat/pull/1322
Issue TrackingPatch
Source: cverecord
https://github.com/libexpat/libexpat/pull/1329

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

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

CVSS

7.8HIGH[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-416

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create accountSign in
Free plan, no card