Vulnerability · CVE-2022-43680
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.
Published Oct 24, 2022 · catalog updated Oct 14, 2026 · libexpat project
Check if you run it
No confirmed exploitation is on record for CVE-2022-43680. EPSS is 2.46%. Act only if a listed version of libexpat project is installed.
Gaps on this record
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- High7.5
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 2.46%
- Remediation
- Advisory link
- Affected products
- cpe debian/debian linux · cpe fedoraproject/fedora · cpe libexpat project/libexpat · cpe netapp/active iq unified manager · cpe netapp/h300s firmware · cpe netapp/h410c firmware
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.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- cpe debian/debian linux10.0
- cpe debian/debian linux11.0
- cpe fedoraproject/fedora35
- cpe fedoraproject/fedora36
- cpe fedoraproject/fedora37
- cpe libexpat project/libexpatversion unspecified
- cpe netapp/active iq unified managerversion unspecified
- cpe netapp/h300s firmwareversion unspecified
- cpe netapp/h410c firmwareversion unspecified
- cpe netapp/h410s firmwareversion unspecified
- cpe netapp/h500s firmwareversion unspecified
- cpe netapp/h700s firmwareversion unspecified
How to fix CVE-2022-43680
Recommended remediation
A patch or advisory reference is linked. Open the original publisher for availability by product version.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2022-43680. EPSS is 2.46%. Act only if a listed version of libexpat project is installed.
Which versions are affected?
Compare what you have installed with debian/debian linux 10.0; debian/debian linux 11.0. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-416: Use After Free. EPSS 2.46%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Oct 24, 2022 · NIST NVD
Detected
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.
Oct 14, 2026 · NIST NVD
Updated
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.
Sources
- CVE.orgVulnerability recordCVE-2022-43680
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2022-43680
30-day exploitation probability 2.5%
first.org - NIST NVDVulnerability recordCVE-2022-43680
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.
nvd.nist.gov
References
Freshness
Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.