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
Elevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 36%CVSS: 9.8Exploit: Elevated riskExposed: 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
75(Track)
EG Risk 75/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
36%
EPSS %ILE
98%
KEV
Not listed

Published

February 16, 2022

Last Modified

May 5, 2025

Advisory Details (10)

Auto-updated Sep 3, 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
https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf
generic

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

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

Locked Out | Packet Storm

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

Vendor Advisories for CVE-2022-25236(20)

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.

Affected Packages

(21 across 19 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
expat2.2.10-2, 2.2.10-2+deb11u12.2.10-2+deb11u2—
libxmltok1.2-4, 1.2-4.1, 1.2-4.1~exp1, 1.2-4.2——
Debian:12(2)
PackageVulnerable rangeFixed inDependents
expat—2.4.5-1—
libxmltok1.2-4, 1.2-4.1, 1.2-4.1~exp1, 1.2-4.2——
Alpine:v3.12(1)
PackageVulnerable rangeFixed inDependents
expat—2.2.10-r2—
Alpine:v3.13(1)
PackageVulnerable rangeFixed inDependents
expat—2.2.10-r4—
Alpine:v3.14(1)
PackageVulnerable rangeFixed inDependents
expat—2.4.5-r0—
Alpine:v3.15(1)
PackageVulnerable rangeFixed inDependents
expat—2.4.5-r0—
Alpine:v3.16(1)
PackageVulnerable rangeFixed inDependents
expat—2.4.5-r0—
Alpine:v3.17(1)
PackageVulnerable rangeFixed inDependents
expat—2.4.5-r0—
Alpine:v3.18(1)
PackageVulnerable rangeFixed inDependents
expat—2.4.5-r0—
Alpine:v3.19(1)
PackageVulnerable rangeFixed inDependents
expat—2.4.5-r0—
Alpine:v3.20(1)
PackageVulnerable rangeFixed inDependents
expat—2.4.5-r0—
Alpine:v3.21(1)
PackageVulnerable rangeFixed inDependents
expat—2.4.5-r0—
Alpine:v3.22(1)
PackageVulnerable rangeFixed inDependents
expat—2.4.5-r0—
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
expat—2.4.5-r0—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
expat—2.4.5-r0—
Debian:10(1)
PackageVulnerable rangeFixed inDependents
expat2.2.6-2, 2.2.6-2+deb10u1, 2.2.6-2+deb10u22.2.6-2+deb10u3—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
expat—2.4.5-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
expat—2.4.5-1—
Debian:9(1)
PackageVulnerable rangeFixed inDependents
expat2.2.0-2, 2.2.0-2+deb9u1, 2.2.0-2+deb9u2, 2.2.0-2+deb9u3, 2.2.0-2+deb9u42.2.0-2+deb9u5—

Weakness Classification(1)

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

Additional Vendor Advisories

(5)

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 7× in last 7d / 25× 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.

Showing the most recent 100 of 130 total refreshes for this CVE.

  1. 2026-09-07 15:58 UTCEPSS rescore
  2. 2026-09-06 13:45 UTCEPSS rescore
  3. 2026-09-05 21:00 UTCOSV refresh
  4. 2026-09-05 15:25 UTCEPSS rescore
  5. 2026-09-04 13:57 UTCEPSS rescore
  6. 2026-09-04 05:04 UTCEPSS rescore
  7. 2026-09-02 14:09 UTCEPSS rescore
  8. 2026-09-01 13:51 UTCEPSS rescore
  9. 2026-08-30 19:14 UTCEPSS rescore
  10. 2026-08-30 01:19 UTCEPSS rescore
  11. 2026-08-28 21:38 UTCEPSS rescore
  12. 2026-08-26 14:43 UTCEPSS rescore
  13. 2026-08-25 13:46 UTCEPSS rescore
  14. 2026-08-25 13:46 UTCEPSS rescore
  15. 2026-08-24 14:13 UTCEPSS rescore
  16. 2026-08-21 23:46 UTCEPSS rescore
  17. 2026-08-20 22:52 UTCEPSS rescore
  18. 2026-08-19 17:01 UTCEPSS rescore
  19. 2026-08-19 08:02 UTCOSV refresh
  20. 2026-08-18 13:45 UTCEPSS rescore
  21. 2026-08-16 14:53 UTCEPSS rescore
  22. 2026-08-16 02:11 UTCEPSS rescore
  23. 2026-08-15 01:27 UTCEPSS rescore
  24. 2026-08-13 21:57 UTCEPSS rescore
  25. 2026-08-12 13:48 UTCEPSS rescore
Show 75 more
  1. 2026-08-08 16:34 UTCEPSS rescore
  2. 2026-08-07 16:24 UTCEPSS rescore
  3. 2026-08-06 13:44 UTCEPSS rescore
  4. 2026-08-05 19:15 UTCEPSS rescore
  5. 2026-08-04 03:57 UTCOSV refresh
  6. 2026-08-01 04:13 UTCEPSS rescore
  7. 2026-07-30 16:25 UTCEPSS rescore
  8. 2026-07-28 15:33 UTCEPSS rescore
  9. 2026-07-26 14:52 UTCEPSS rescore
  10. 2026-07-26 14:52 UTCEPSS rescore
  11. 2026-07-25 14:15 UTCEPSS rescore
  12. 2026-07-24 14:15 UTCEPSS rescore
  13. 2026-07-23 14:16 UTCEPSS rescore
  14. 2026-07-23 02:09 UTCEG score recompute
  15. 2026-07-22 22:56 UTCEG score recompute
  16. 2026-07-22 14:06 UTCEPSS rescore
  17. 2026-07-22 14:06 UTCEPSS rescore
  18. 2026-07-21 15:22 UTCEPSS rescore
  19. 2026-07-21 15:22 UTCEPSS rescore
  20. 2026-07-20 17:05 UTCEPSS rescore
  21. 2026-07-19 02:27 UTCEPSS rescore
  22. 2026-07-18 10:02 UTCEPSS rescore
  23. 2026-07-18 10:02 UTCEPSS rescore
  24. 2026-07-17 23:29 UTCOSV refresh
  25. 2026-07-16 17:00 UTCEPSS rescore
  26. 2026-07-16 17:00 UTCEPSS rescore
  27. 2026-07-15 16:56 UTCEPSS rescore
  28. 2026-07-15 16:56 UTCEPSS rescore
  29. 2026-07-15 01:58 UTCEPSS rescore
  30. 2026-07-15 01:58 UTCEPSS rescore
  31. 2026-07-13 22:27 UTCEPSS rescore
  32. 2026-07-13 06:11 UTCEPSS rescore
  33. 2026-07-13 06:11 UTCEPSS rescore
  34. 2026-07-12 05:44 UTCEPSS rescore
  35. 2026-07-11 08:25 UTCEPSS rescore
  36. 2026-07-09 19:07 UTCEPSS rescore
  37. 2026-07-07 13:44 UTCEPSS rescore
  38. 2026-07-06 02:21 UTCEPSS rescore
  39. 2026-07-05 02:28 UTCEPSS rescore
  40. 2026-07-04 06:29 UTCEPSS rescore
  41. 2026-07-04 06:29 UTCEPSS rescore
  42. 2026-07-01 15:04 UTCEPSS rescore
  43. 2026-06-29 20:32 UTCOSV refresh
  44. 2026-06-29 14:04 UTCEPSS rescore
  45. 2026-06-29 14:04 UTCEPSS rescore
  46. 2026-06-28 14:06 UTCEPSS rescore
  47. 2026-06-28 04:54 UTCEPSS rescore
  48. 2026-06-28 04:54 UTCEPSS rescore
  49. 2026-06-27 03:07 UTCEPSS rescore
  50. 2026-06-25 13:48 UTCEPSS rescore
  51. 2026-06-24 14:03 UTCEPSS rescore
  52. 2026-06-24 14:03 UTCEPSS rescore
  53. 2026-06-23 21:31 UTCEPSS rescore
  54. 2026-06-23 21:31 UTCEPSS rescore
  55. 2026-06-21 01:58 UTCEPSS rescore
  56. 2026-06-21 01:58 UTCEPSS rescore
  57. 2026-06-18 17:51 UTCEPSS rescore
  58. 2026-06-18 17:51 UTCEPSS rescore
  59. 2026-06-17 17:51 UTCEPSS rescore
  60. 2026-06-17 17:51 UTCEPSS rescore
  61. 2026-06-16 17:51 UTCEPSS rescore
  62. 2026-06-15 17:46 UTCEPSS rescore
  63. 2026-06-14 23:15 UTCEPSS rescore
  64. 2026-06-14 23:15 UTCEPSS rescore
  65. 2026-06-13 22:58 UTCEPSS rescore
  66. 2026-06-13 22:58 UTCEPSS rescore
  67. 2026-06-12 23:10 UTCEPSS rescore
  68. 2026-06-12 23:10 UTCEPSS rescore
  69. 2026-06-12 08:40 UTCOSV refresh
  70. 2026-06-11 13:58 UTCEPSS rescore
  71. 2026-06-11 13:58 UTCEPSS rescore
  72. 2026-06-10 22:16 UTCEPSS rescore
  73. 2026-06-10 13:20 UTCEPSS rescore
  74. 2026-06-08 14:15 UTCEPSS rescore
  75. 2026-06-08 14:15 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 36% probability of exploitation in the next 30 days, which ranks it in the top 1.6% of all scored CVEs.
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

Explore →

Is Your Infrastructure Affected by CVE-2022-25236?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs