CVE-2022-25236

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-02-17. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this weekElevated
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 36%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply it.

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)
EG Risk
—
EPSS
98.3%
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

Vendor Advisories for CVE-2022-25236(13)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(25)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibexpat1 (2.2.5-3ubuntu0.4) @ bionic2026-05-26ubuntu
ubuntulibinsighttoolkit3.20 (3.20.1+git20120521-6ubuntu0.1~esm1) @ xenial2026-05-26ubuntu
ubuntulibcoin80v5 (3.1.4~abc9f50+dfsg1-1ubuntu0.1~esm2) @ xenial2026-05-26ubuntu
ubuntulibxmltok1-dev (1.2-4ubuntu0.18.04.1~esm1) @ bionic2026-05-26ubuntu
ubuntuswish-e-dev (2.4.7-4ubuntu0.1~esm1) @ xenial2026-05-26ubuntu
redhatmingw-expat-0:2.4.8-1.el82022-11-08redhat
redhatexpat2022-10-26redhat
redhatexpat-0:2.0.1-14.el6_102022-04-12redhat
redhatredhat-virtualization-host-0:4.3.22-20220330.1.el7_92022-04-07redhat
redhatexpat-0:2.2.5-3.el8_2.22022-03-28redhat
redhatexpat-0:2.2.5-3.el8_1.12022-03-28redhat
redhatexpat-0:2.1.0-14.el7_92022-03-28redhat
redhatredhat-virtualization-host-0:4.4.10-202203211649_8.52022-03-24redhat
redhatexpat-0:2.2.5-4.el8_4.22022-03-22redhat
redhatexpat-0:2.2.5-4.el8_5.32022-03-16redhat
redhatthunderbird-0:91.7.0-2.el8_52022-03-14redhat
redhatthunderbird-0:91.7.0-2.el8_22022-03-14redhat
redhatthunderbird-0:91.7.0-2.el8_12022-03-14redhat
redhatthunderbird-0:91.7.0-2.el7_92022-03-14redhat
redhatthunderbird-0:91.7.0-2.el8_42022-03-14redhat
redhatfirefox-0:91.7.0-3.el8_42022-03-10redhat
redhatfirefox-0:91.7.0-3.el8_22022-03-10redhat
redhatfirefox-0:91.7.0-3.el8_52022-03-10redhat
redhatfirefox-0:91.7.0-3.el8_12022-03-10redhat
redhatfirefox-0:91.7.0-3.el7_92022-03-10redhat

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.

Additional Vendor Advisories

(12)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 12× in last 7d / 40× 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.

  1. 2026-07-22 22:56 UTCEG score recompute
  2. 2026-07-22 14:06 UTCEPSS rescore
  3. 2026-07-22 14:06 UTCEPSS rescore
  4. 2026-07-21 15:22 UTCEPSS rescore
  5. 2026-07-21 15:22 UTCEPSS rescore
  6. 2026-07-20 17:05 UTCEPSS rescore
  7. 2026-07-19 02:27 UTCEPSS rescore
  8. 2026-07-18 10:02 UTCEPSS rescore
  9. 2026-07-18 10:02 UTCEPSS rescore
  10. 2026-07-17 23:29 UTCOSV refresh
  11. 2026-07-16 17:00 UTCEPSS rescore
  12. 2026-07-16 17:00 UTCEPSS rescore
  13. 2026-07-15 16:56 UTCEPSS rescore
  14. 2026-07-15 16:56 UTCEPSS rescore
  15. 2026-07-15 01:58 UTCEPSS rescore
  16. 2026-07-15 01:58 UTCEPSS rescore
  17. 2026-07-13 22:27 UTCEPSS rescore
  18. 2026-07-13 06:11 UTCEPSS rescore
  19. 2026-07-13 06:11 UTCEPSS rescore
  20. 2026-07-12 05:44 UTCEPSS rescore
  21. 2026-07-11 08:25 UTCEPSS rescore
  22. 2026-07-09 19:07 UTCEPSS rescore
  23. 2026-07-07 13:44 UTCEPSS rescore
  24. 2026-07-06 02:21 UTCEPSS rescore
  25. 2026-07-05 02:28 UTCEPSS rescore
Show 66 more
  1. 2026-07-04 06:29 UTCEPSS rescore
  2. 2026-07-04 06:29 UTCEPSS rescore
  3. 2026-07-01 15:04 UTCEPSS rescore
  4. 2026-06-29 20:32 UTCOSV refresh
  5. 2026-06-29 14:04 UTCEPSS rescore
  6. 2026-06-29 14:04 UTCEPSS rescore
  7. 2026-06-28 14:06 UTCEPSS rescore
  8. 2026-06-28 04:54 UTCEPSS rescore
  9. 2026-06-28 04:54 UTCEPSS rescore
  10. 2026-06-27 03:07 UTCEPSS rescore
  11. 2026-06-25 13:48 UTCEPSS rescore
  12. 2026-06-24 14:03 UTCEPSS rescore
  13. 2026-06-24 14:03 UTCEPSS rescore
  14. 2026-06-23 21:31 UTCEPSS rescore
  15. 2026-06-23 21:31 UTCEPSS rescore
  16. 2026-06-21 01:58 UTCEPSS rescore
  17. 2026-06-21 01:58 UTCEPSS rescore
  18. 2026-06-18 17:51 UTCEPSS rescore
  19. 2026-06-18 17:51 UTCEPSS rescore
  20. 2026-06-17 17:51 UTCEPSS rescore
  21. 2026-06-17 17:51 UTCEPSS rescore
  22. 2026-06-16 17:51 UTCEPSS rescore
  23. 2026-06-15 17:46 UTCEPSS rescore
  24. 2026-06-14 23:15 UTCEPSS rescore
  25. 2026-06-14 23:15 UTCEPSS rescore
  26. 2026-06-13 22:58 UTCEPSS rescore
  27. 2026-06-13 22:58 UTCEPSS rescore
  28. 2026-06-12 23:10 UTCEPSS rescore
  29. 2026-06-12 23:10 UTCEPSS rescore
  30. 2026-06-12 08:40 UTCOSV refresh
  31. 2026-06-11 13:58 UTCEPSS rescore
  32. 2026-06-11 13:58 UTCEPSS rescore
  33. 2026-06-10 22:16 UTCEPSS rescore
  34. 2026-06-10 13:20 UTCEPSS rescore
  35. 2026-06-08 14:15 UTCEPSS rescore
  36. 2026-06-08 14:15 UTCEPSS rescore
  37. 2026-06-07 15:23 UTCEPSS rescore
  38. 2026-06-07 15:23 UTCEPSS rescore
  39. 2026-06-06 13:46 UTCEPSS rescore
  40. 2026-06-06 13:46 UTCEPSS rescore
  41. 2026-06-05 22:45 UTCEPSS rescore
  42. 2026-06-05 06:09 UTCEPSS rescore
  43. 2026-06-05 06:09 UTCEPSS rescore
  44. 2026-06-04 13:11 UTCEPSS rescore
  45. 2026-06-04 13:11 UTCEPSS rescore
  46. 2026-06-02 20:11 UTCEPSS rescore
  47. 2026-06-02 20:11 UTCEPSS rescore
  48. 2026-06-02 20:11 UTCEPSS rescore
  49. 2026-06-01 13:50 UTCEPSS rescore
  50. 2026-06-01 13:50 UTCEPSS rescore
  51. 2026-06-01 13:50 UTCEPSS rescore
  52. 2026-05-31 22:29 UTCEPSS rescore
  53. 2026-05-31 22:29 UTCEPSS rescore
  54. 2026-05-31 00:15 UTCEPSS rescore
  55. 2026-05-31 00:15 UTCEPSS rescore
  56. 2026-05-29 13:42 UTCEPSS rescore
  57. 2026-05-28 13:43 UTCEPSS rescore
  58. 2026-05-28 13:43 UTCEPSS rescore
  59. 2026-05-28 13:43 UTCEPSS rescore
  60. 2026-05-27 13:39 UTCEPSS rescore
  61. 2026-05-27 13:39 UTCEPSS rescore
  62. 2026-05-26 13:43 UTCEPSS rescore
  63. 2026-05-26 02:58 UTCEG score recompute
  64. 2026-05-26 02:58 UTCVendor advisory
  65. 2026-05-26 02:58 UTCGHSA enrichment
  66. 2026-05-23 11:10 UTCOSV refresh

Related CVEs(same vendor + same CWE)

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 98.3% 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

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