CVE-2022-25236

CRITICALNVD 9.89.8—

9.8

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

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 92.2%
KEV: Not listed

Published

February 16, 2022

Last Modified

May 5, 2025

Advisory Details (9)

Auto-updated Jun 9, 2026

Patch available. Sources: github_pr.

generic

[SECURITY] [DSA 5085-1] expat security update

https://www.debian.org/security/2022/dsa-5085

generic

NetApp Product Security

https://security.netapp.com/advisory/ntap-20220303-0008/

generic

Expat: Multiple Vulnerabilities (GLSA 202209-24) — Gentoo security

https://security.gentoo.org/glsa/202209-24

generic

[SECURITY] Fedora 35 Update: mingw-expat-2.4.6-1.fc35 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y27XO3JMKAOMQZVPS3B4MJGEAHCZF5OM/

generic

[SECURITY] Fedora 34 Update: mingw-expat-2.4.6-1.fc34 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3UFRBA3UQVIQKXTBUQXDWQOVWNBKLERU/

generic Patch Available

[SECURITY] [DLA 2935-1] expat security update

https://lists.debian.org/debian-lts-announce/2022/03/msg00007.html

github_pr

[CVE-2022-25236] lib: Protect against insertion of namesep characters into namespace URIs

Fix merged in libexpat/libexpat PR #561 on 2022-02-18 — awaiting tagged release

https://github.com/libexpat/libexpat/pull/561

generic

oss-security - Expat 2.4.5 released, includes 5 security fixes

http://www.openwall.com/lists/oss-security/2022/02/19/1

generic

Packet Storm

http://packetstormsecurity.com/files/167238/Zoom-XMPP-Stanza-Smuggling-Remote-Code-Execution.html

Patch Availability(25)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	libexpat1 (2.2.5-3ubuntu0.4) @ bionic	2026-05-26	ubuntu
ubuntu	libinsighttoolkit3.20 (3.20.1+git20120521-6ubuntu0.1~esm1) @ xenial	2026-05-26	ubuntu
ubuntu	libcoin80v5 (3.1.4~abc9f50+dfsg1-1ubuntu0.1~esm2) @ xenial	2026-05-26	ubuntu
ubuntu	libxmltok1-dev (1.2-4ubuntu0.18.04.1~esm1) @ bionic	2026-05-26	ubuntu
ubuntu	swish-e-dev (2.4.7-4ubuntu0.1~esm1) @ xenial	2026-05-26	ubuntu
redhat	mingw-expat-0:2.4.8-1.el8	2022-11-08	redhat
redhat	expat	2022-10-26	redhat
redhat	expat-0:2.0.1-14.el6_10	2022-04-12	redhat
redhat	redhat-virtualization-host-0:4.3.22-20220330.1.el7_9	2022-04-07	redhat
redhat	expat-0:2.2.5-3.el8_2.2	2022-03-28	redhat
redhat	expat-0:2.2.5-3.el8_1.1	2022-03-28	redhat
redhat	expat-0:2.1.0-14.el7_9	2022-03-28	redhat
redhat	redhat-virtualization-host-0:4.4.10-202203211649_8.5	2022-03-24	redhat
redhat	expat-0:2.2.5-4.el8_4.2	2022-03-22	redhat
redhat	expat-0:2.2.5-4.el8_5.3	2022-03-16	redhat
redhat	thunderbird-0:91.7.0-2.el8_5	2022-03-14	redhat
redhat	thunderbird-0:91.7.0-2.el8_2	2022-03-14	redhat
redhat	thunderbird-0:91.7.0-2.el8_1	2022-03-14	redhat
redhat	thunderbird-0:91.7.0-2.el7_9	2022-03-14	redhat
redhat	thunderbird-0:91.7.0-2.el8_4	2022-03-14	redhat
redhat	firefox-0:91.7.0-3.el8_4	2022-03-10	redhat
redhat	firefox-0:91.7.0-3.el8_2	2022-03-10	redhat
redhat	firefox-0:91.7.0-3.el8_5	2022-03-10	redhat
redhat	firefox-0:91.7.0-3.el8_1	2022-03-10	redhat
redhat	firefox-0:91.7.0-3.el7_9	2022-03-10	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-668Exposure of Resource to Wrong Sphere

All Vendor Advisories

(25)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 11× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-08 14:15 UTCEPSS rescore
2026-06-08 14:15 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-04 13:11 UTCEPSS rescore
2026-06-04 13:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore

Frequently asked(5)

What is CVE-2022-25236?

CVE-2022-25236 is a critical vulnerability published on February 16, 2022. xmlparse.c in Expat (aka libexpat) before 2.4.5 allows attackers to insert namespace-separator characters into namespace URIs.

When was CVE-2022-25236 disclosed?

CVE-2022-25236 was first published in the National Vulnerability Database on February 16, 2022, with the most recent update on May 5, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2022-25236 actively exploited?

CVE-2022-25236 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 92.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2022-25236?

CVE-2022-25236 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2022-25236?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2022-25236, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2022-25236

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CVE-2022-25236

Published

Last Modified

Advisory Details (9)

[SECURITY] [DSA 5085-1] expat security update

NetApp Product Security

Expat: Multiple Vulnerabilities (GLSA 202209-24) — Gentoo security

[SECURITY] Fedora 35 Update: mingw-expat-2.4.6-1.fc35 - package-announce - Fedora mailing-lists

[SECURITY] Fedora 34 Update: mingw-expat-2.4.6-1.fc34 - package-announce - Fedora mailing-lists

[SECURITY] [DLA 2935-1] expat security update

[CVE-2022-25236] lib: Protect against insertion of namesep characters into namespace URIs

oss-security - Expat 2.4.5 released, includes 5 security fixes

Packet Storm

Patch Availability(25)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2022-25236?

Same vendor

Same CWE

CVE-2022-25236

📅 Published

🔄 Last Modified

📋 Advisory Details (9)

[SECURITY] [DSA 5085-1] expat security update

NetApp Product Security

Expat: Multiple Vulnerabilities (GLSA 202209-24) — Gentoo security

[SECURITY] Fedora 35 Update: mingw-expat-2.4.6-1.fc35 - package-announce - Fedora mailing-lists

[SECURITY] Fedora 34 Update: mingw-expat-2.4.6-1.fc34 - package-announce - Fedora mailing-lists

[SECURITY] [DLA 2935-1] expat security update

[CVE-2022-25236] lib: Protect against insertion of namesep characters into namespace URIs

oss-security - Expat 2.4.5 released, includes 5 security fixes

Packet Storm

Patch Availability(25)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2022-25236?

🔗 Related CVEs(same vendor + same CWE)

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Last Modified

Advisory Details (9)

Frequently asked(5)

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