CVE-2022-40674 — libexpat before 2
libexpat before 2.4.9 has a use-after-free in the doContent function in xmlparse.c.
Published
2022-09-14T11:15:54.020
Last modified
2026-10-14T18:17:05.450
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
01What is this vulnerability?
libexpat before 2.4.9 has a use-after-free in the doContent function in xmlparse.c.
02Affected products
No structured affected-product list available — see references below for vendor advisories.
03Active exploitation status
Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.
04Recommended remediation
- Patch to a fixed version listed in the vendor advisory (see references below).
- Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
- Hunt historical logs for exploitation indicators — see Detection signatures below.
05Technical details
For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.
06Detection signatures
Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.
07Related CVEs
No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.
08Timeline
- Published: 2022-09-14T11:15:54.020
- Last modified: 2026-10-14T18:17:05.450
09References
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