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Vulnerabilities

Vulnerability · CVE-2022-25236

xmlparse.c in Expat (aka libexpat) before 2.4.5 allows attackers to insert namespace-separator characters into namespace URIs.

Published Feb 16, 2022 · catalog updated Oct 14, 2026 · libexpat project

Check this week

CVE-2022-25236 is not in CISA KEV. FIRST estimates a 35.27% chance of exploitation in the next 30 days. Check whether you run libexpat project.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
35.27%
Remediation
Advisory link
Affected products
cpe debian/debian linux · cpe libexpat project/libexpat · cpe oracle/http server · cpe oracle/zfs storage appliance kit · cpe siemens/sinema remote connect server

xmlparse.c in Expat (aka libexpat) before 2.4.5 allows attackers to insert namespace-separator characters into namespace URIs.

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 libexpat project/libexpatversion unspecified
  • cpe oracle/http server12.2.1.3.0
  • cpe oracle/http server12.2.1.4.0
  • cpe oracle/zfs storage appliance kit8.8
  • cpe siemens/sinema remote connect serverversion unspecified

How to fix CVE-2022-25236

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2022-25236 is not in CISA KEV. FIRST estimates a 35.27% chance of exploitation in the next 30 days. Check whether you run libexpat project.

Which versions are affected?

Compare what you have installed with debian/debian linux 10.0; debian/debian linux 11.0; oracle/http server 12.2.1.3.0; oracle/http server 12.2.1.4.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-668: Exposure of Resource to Wrong Sphere. EPSS 35.27%. 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.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 16, 2022 · NIST NVD

    Detected

    xmlparse.c in Expat (aka libexpat) before 2.4.5 allows attackers to insert namespace-separator characters into namespace URIs.

  2. Oct 14, 2026 · NIST NVD

    Updated

    xmlparse.c in Expat (aka libexpat) before 2.4.5 allows attackers to insert namespace-separator characters into namespace URIs.

Sources

  • CVE.orgVulnerability recordCVE-2022-25236

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2022-25236

    30-day exploitation probability 35.3%

    first.org
  • NIST NVDVulnerability recordCVE-2022-25236

    xmlparse.c in Expat (aka libexpat) before 2.4.5 allows attackers to insert namespace-separator characters into namespace URIs.

    nvd.nist.gov
  • Packet Storm SecurityCited referencehttp://packetstormsecurity.com/files/167238/Zoom-XMPP-Stanza-Smuggling-Remote-Code-Execution.html

    Packet Storm link already published on the finding.

    packetstormsecurity.com

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.