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Medium 4.9Published Aug 20, 2026
CVE-2026-76957libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks.
Updated under an hour ago ()
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It affects libexpat project libexpat. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 4.9 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
- Weakness (CWE)
- CWE-416
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- mitre
- NVD analysis
- Analyzed
- Record last updated
- Aug 20, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
libexpat project libexpat libexpat_project:libexpat (from the name) | before 2.8.4 | CNA record |
libexpat_project libexpat libexpat_project:libexpat | before 2.8.4 | NVD |
References
- https://github.com/libexpat/libexpat/pull/1322issue-tracking, patch, vendor-advisory
- https://github.com/libexpat/libexpat/pull/1329issue-tracking, patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.