Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2022-43680

CVE-2022-43680HIGH

n/a n/a — In libexpat through 2.4.9, there is a use-after free caused by overeager destruction of a shared DTD in XML_ExternalEntityParserCreate in…

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  N  N  H    7.5   .0246   84.2     —

AFFECTED
  Product  Versions  Fixed
  n/a      n/a –     —

TIMELINE
  Oct 24  Reserved by mitre
  Oct 24  Published (CNA: mitre)
  Oct 14  EXPLOIT PUBLISHED — CVE-2022-43680. Public exploit reference added.

CWE-416 · CNA: mitre · CVSS v3.1 · 17 references · NVD status: Modified

Description

In libexpat through 2.4.9, there is a use-after free caused by overeager destruction of a shared DTD in XML_ExternalEntityParserCreate in out-of-memory situations.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
October 24, 2022	Reserved	Reserved by mitre
October 24, 2022	Published	Published (CNA: mitre)
October 14, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2022-43680. Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
n/a	n/a	—	n/a	—

Weaknesses

CWE-416

References (17)

http://www.openwall.com/lists/oss-security/2023/12/28/5 [Mailing List, Third Party Advisory]
http://www.openwall.com/lists/oss-security/2024/01/03/5 [Mailing List, Third Party Advisory]
https://cert-portal.siemens.com/productcert/html/ssa-398330.html
https://cert-portal.siemens.com/productcert/html/ssa-892048.html
https://github.com/libexpat/libexpat/issues/649 [Exploit, Issue Tracking, Patch, Third Party Advisory]
https://github.com/libexpat/libexpat/pull/616 [Exploit, Issue Tracking, Patch, Third Party Advisory]
https://github.com/libexpat/libexpat/pull/650 [Exploit, Issue Tracking, Patch, Third Party Advisory]
https://lists.debian.org/debian-lts-announce/2022/10/msg00033.html [Mailing List, Third Party Advisory]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AJ5VY2VYXE4WTRGQ6LMGLF6FV3SY37YE/ [Mailing List, Third Party Advisory]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BY4OPSIB33ETNUXZY2UPZ4NGQ3OKDY4D/ [Mailing List, Third Party Advisory]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DPQVIF6TOJNY2T3ZZETFKR4G34FFREBQ/ [Mailing List, Third Party Advisory]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FFCOMBSOJKLIKCGCJWHLJXO4EVYBG7AR/ [Mailing List, Third Party Advisory]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IUJ2BULJTZ2BMSKQHB6US674P55UCWWS/ [Mailing List, Third Party Advisory]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XG5XOOB7CD55CEE6OJYKSACSIMQ4RWQ6/ [Mailing List, Third Party Advisory]
https://security.gentoo.org/glsa/202210-38 [Third Party Advisory]
https://security.netapp.com/advisory/ntap-20221118-0007/ [Third Party Advisory]
https://www.debian.org/security/2022/dsa-5266 [Third Party Advisory]

Authoritative record: CVE-2022-43680 at cve.org

Weaknesses: CWE-416

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2022-43680 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.