CVE-2022-26485

CRITICALNVD 8.89.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-03-07), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 8.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 5 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 14%CVSS: 8.8Exploit: cisa kev · ssvc active · epss top5pct · public exploitExposed: 0

A fix is available — apply it.

Removing an XSLT parameter during processing could have lead to an exploitable use-after-free. We have had reports of attacks in the wild abusing this flaw. This vulnerability affects Firefox < 97.0.2, Firefox ESR < 91.6.1, Firefox for Android < 97.3.0, Thunderbird < 91.6.2, and Focus < 97.3.0.

CVSS v3
8.8
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

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
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
14%
EPSS %ILE
96%
KEV
⚠ Exploited

Published

December 22, 2022

Last Modified

August 19, 2026

Advisory Details (3)

Auto-updated Jun 1, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-26485
generic🔴 Active Exploitation

Security Vulnerabilities fixed in Firefox 97.0.2, Firefox ESR 91.6.1, Firefox for Android 97.3.0, and Focus 97.3.0 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2022-09/
generic🔴 Active Exploitation

1758062 - (CVE-2022-26485) heap-use-after-free txMozillaXSLTProcessor.cpp:1361 in txVariable::Convert [exploited in the wild]

https://bugzilla.mozilla.org/show_bug.cgi?id=1758062

Vendor Advisories for CVE-2022-26485(10)

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

Patch Availability(11)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntufirefox-locale-ast (97.0.2+build1-0ubuntu0.21.10.1) @ impish2026-08-25ubuntu
redhatthunderbird-0:91.7.0-2.el8_52022-03-14redhat
redhatthunderbird-0:91.7.0-2.el7_92022-03-14redhat
redhatthunderbird-0:91.7.0-2.el8_12022-03-14redhat
redhatthunderbird-0:91.7.0-2.el8_22022-03-14redhat
redhatthunderbird-0:91.7.0-2.el8_42022-03-14redhat
redhatfirefox-0:91.7.0-3.el8_12022-03-10redhat
redhatfirefox-0:91.7.0-3.el8_22022-03-10redhat
redhatfirefox-0:91.7.0-3.el7_92022-03-10redhat
redhatfirefox-0:91.7.0-3.el8_52022-03-10redhat
redhatfirefox-0:91.7.0-3.el8_42022-03-10redhat

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

(12 across 6 ecosystems)
Debian:10(2)
PackageVulnerable rangeFixed inDependents
firefox-esr60.7.2esr-1 ... 91.6.1esr-1~deb9u1 (134 versions)91.6.1esr-1~deb10u1—
thunderbird1:60.7.2-1 ... 1:91.6.2-1~deb9u1 (170 versions)1:91.6.2-1~deb10u1—
Debian:11(2)
PackageVulnerable rangeFixed inDependents
firefox-esr78.12.0esr-1 ... 91.6.1esr-1~deb9u1 (32 versions)91.6.1esr-1~deb11u1—
thunderbird1:78.12.0-1 ... 1:91.6.2-1~deb9u1 (47 versions)1:91.6.2-1~deb11u1—
Debian:12(2)
PackageVulnerable rangeFixed inDependents
firefox-esr—91.6.1esr-1—
thunderbird—1:91.6.2-1—
Debian:13(2)
PackageVulnerable rangeFixed inDependents
firefox-esr—91.6.1esr-1—
thunderbird—1:91.6.2-1—
Debian:14(2)
PackageVulnerable rangeFixed inDependents
firefox-esr—91.6.1esr-1—
thunderbird—1:91.6.2-1—
Debian:9(2)
PackageVulnerable rangeFixed inDependents
firefox-esr45.9.0esr-1 ... 91.6.0esr-1~deb9u1 (241 versions)91.6.1esr-1~deb9u1—
thunderbird1.5-4 ... 1:91.6.1-1~deb9u1 (251 versions)1:91.6.2-1~deb9u1—

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

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 109× in last 7d / 456× 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 1,280 total refreshes for this CVE.

  1. 2026-08-25 22:11 UTCVendor advisory
  2. 2026-08-25 22:10 UTCGHSA enrichment
  3. 2026-08-25 18:31 UTCVendor advisory
  4. 2026-08-25 18:30 UTCGHSA enrichment
  5. 2026-08-25 14:50 UTCEG score recompute
  6. 2026-08-25 14:50 UTCVendor advisory
  7. 2026-08-25 14:50 UTCGHSA enrichment
  8. 2026-08-25 13:46 UTCEPSS rescore
  9. 2026-08-25 13:46 UTCEPSS rescore
  10. 2026-08-25 11:11 UTCVendor advisory
  11. 2026-08-25 11:11 UTCGHSA enrichment
  12. 2026-08-25 07:30 UTCVendor advisory
  13. 2026-08-25 07:30 UTCGHSA enrichment
  14. 2026-08-25 03:51 UTCVendor advisory
  15. 2026-08-25 03:51 UTCGHSA enrichment
  16. 2026-08-25 00:11 UTCVendor advisory
  17. 2026-08-25 00:11 UTCGHSA enrichment
  18. 2026-08-24 20:31 UTCVendor advisory
  19. 2026-08-24 20:31 UTCGHSA enrichment
  20. 2026-08-24 18:52 UTCCISA KEV update
  21. 2026-08-24 16:52 UTCEG score recompute
  22. 2026-08-24 16:52 UTCVendor advisory
  23. 2026-08-24 16:52 UTCGHSA enrichment
  24. 2026-08-24 14:13 UTCEPSS rescore
  25. 2026-08-24 13:11 UTCVendor advisory
Show 75 more
  1. 2026-08-24 13:11 UTCGHSA enrichment
  2. 2026-08-24 09:32 UTCEG score recompute
  3. 2026-08-24 09:32 UTCVendor advisory
  4. 2026-08-24 09:32 UTCGHSA enrichment
  5. 2026-08-24 05:52 UTCVendor advisory
  6. 2026-08-24 05:52 UTCGHSA enrichment
  7. 2026-08-24 02:11 UTCVendor advisory
  8. 2026-08-24 02:11 UTCGHSA enrichment
  9. 2026-08-23 22:30 UTCVendor advisory
  10. 2026-08-23 22:30 UTCGHSA enrichment
  11. 2026-08-23 18:50 UTCVendor advisory
  12. 2026-08-23 18:50 UTCGHSA enrichment
  13. 2026-08-23 15:11 UTCVendor advisory
  14. 2026-08-23 15:11 UTCGHSA enrichment
  15. 2026-08-23 11:30 UTCVendor advisory
  16. 2026-08-23 11:30 UTCGHSA enrichment
  17. 2026-08-23 07:49 UTCVendor advisory
  18. 2026-08-23 07:49 UTCGHSA enrichment
  19. 2026-08-23 04:10 UTCVendor advisory
  20. 2026-08-23 04:09 UTCGHSA enrichment
  21. 2026-08-23 00:30 UTCEG score recompute
  22. 2026-08-23 00:30 UTCVendor advisory
  23. 2026-08-23 00:30 UTCGHSA enrichment
  24. 2026-08-22 20:50 UTCVendor advisory
  25. 2026-08-22 20:50 UTCGHSA enrichment
  26. 2026-08-22 17:09 UTCVendor advisory
  27. 2026-08-22 17:09 UTCGHSA enrichment
  28. 2026-08-22 13:29 UTCVendor advisory
  29. 2026-08-22 13:29 UTCGHSA enrichment
  30. 2026-08-22 09:49 UTCVendor advisory
  31. 2026-08-22 09:49 UTCGHSA enrichment
  32. 2026-08-22 06:09 UTCVendor advisory
  33. 2026-08-22 06:09 UTCGHSA enrichment
  34. 2026-08-22 02:28 UTCEG score recompute
  35. 2026-08-22 02:28 UTCVendor advisory
  36. 2026-08-22 02:28 UTCGHSA enrichment
  37. 2026-08-21 23:46 UTCEPSS rescore
  38. 2026-08-21 22:48 UTCVendor advisory
  39. 2026-08-21 22:48 UTCGHSA enrichment
  40. 2026-08-21 19:08 UTCVendor advisory
  41. 2026-08-21 19:08 UTCGHSA enrichment
  42. 2026-08-21 16:49 UTCCISA KEV update
  43. 2026-08-21 15:28 UTCVendor advisory
  44. 2026-08-21 15:28 UTCGHSA enrichment
  45. 2026-08-21 11:48 UTCVendor advisory
  46. 2026-08-21 11:48 UTCGHSA enrichment
  47. 2026-08-21 08:08 UTCVendor advisory
  48. 2026-08-21 08:08 UTCGHSA enrichment
  49. 2026-08-21 04:28 UTCVendor advisory
  50. 2026-08-21 04:28 UTCGHSA enrichment
  51. 2026-08-21 00:48 UTCEG score recompute
  52. 2026-08-21 00:48 UTCVendor advisory
  53. 2026-08-21 00:48 UTCGHSA enrichment
  54. 2026-08-20 22:52 UTCEPSS rescore
  55. 2026-08-20 21:08 UTCVendor advisory
  56. 2026-08-20 21:08 UTCGHSA enrichment
  57. 2026-08-20 17:28 UTCVendor advisory
  58. 2026-08-20 17:28 UTCGHSA enrichment
  59. 2026-08-20 17:06 UTCCISA KEV update
  60. 2026-08-20 13:48 UTCVendor advisory
  61. 2026-08-20 13:48 UTCGHSA enrichment
  62. 2026-08-20 10:08 UTCVendor advisory
  63. 2026-08-20 10:08 UTCGHSA enrichment
  64. 2026-08-20 06:29 UTCVendor advisory
  65. 2026-08-20 06:29 UTCGHSA enrichment
  66. 2026-08-20 02:48 UTCVendor advisory
  67. 2026-08-20 02:48 UTCGHSA enrichment
  68. 2026-08-19 23:06 UTCVendor advisory
  69. 2026-08-19 23:06 UTCGHSA enrichment
  70. 2026-08-19 19:25 UTCEG score recompute
  71. 2026-08-19 19:25 UTCVendor advisory
  72. 2026-08-19 19:25 UTCGHSA enrichment
  73. 2026-08-19 17:33 UTCCISA KEV update
  74. 2026-08-19 17:01 UTCEPSS rescore
  75. 2026-08-19 15:45 UTCVendor advisory

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCmistymntncop/CVE-2022-26485
    First seen Jan 31, 2023
    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(6)

What is CVE-2022-26485?
CVE-2022-26485 is a critical vulnerability published on December 22, 2022. Removing an XSLT parameter during processing could have lead to an exploitable use-after-free. We have had reports of attacks in the wild abusing this flaw. This vulnerability affects Firefox < 97.0.2, Firefox ESR < 91.6.1, Firefox for Android < 97.3.0, Thunderbird < 91.6.2, and Focus < 97.3.0.
When was CVE-2022-26485 disclosed?
CVE-2022-26485 was first published in the National Vulnerability Database on December 22, 2022, with the most recent update on August 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2022-26485 actively exploited?
Yes. CISA added CVE-2022-26485 to the Known Exploited Vulnerabilities catalog on March 7, 2022, affecting Mozilla Firefox. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2022-26485?
CVE-2022-26485 has a CVSS v3 base score of 8.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2022-26485?
CVE-2022-26485 affects Mozilla Firefox. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2022-26485?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2022-26485, 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-2022-26485

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