CVE-2026-41635

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.6%, top 52% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.8%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Apache MINA's AbstractIoBuffer.resolveClass() contains two branches, one of them (for static classes or primitive types) does not check the class at all, bypassing the classname allowlist and allowing arbitrary code to be executed.

The fix checks if the class is present in the accepted class filter before calling Class.forName(). 

Affected versions are Apache MINA 2.0.0 <= 2.0.27, 2.1.0 <= 2.1.10, and

2.2.0 <= 2.2.5.

The problem is resolved in Apache MINA 2.0.28, 2.1.11, and 2.2.6 by applying the classname allowlist earlier.

Affected are applications using Apache MINA that call  IoBuffer.getObject().

Applications using Apache MINA are advised to upgrade.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
59
EG Risk 59/100

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%
Exploitation1% × 40%
Automatability100% × 15%
EPSS PROB
0.8%
EPSS %ILE
55th
KEV
Not listed

Published

April 27, 2026

Last Modified

April 29, 2026

Advisory Details (2)

Auto-updated Oct 8, 2026
Patch available.
generic

oss-security - ZDRES-059: CVE-2026-41635: Apache MINA: AbstractIoBuffer.resolveClass() null-clazz Branch Skips acceptMatchers Filter — Full Object Deserialization RCE

http://www.openwall.com/lists/oss-security/2026/04/27/4
generic

Pony Mail

https://lists.apache.org/thread/1l91w1mqsb3lwfd504fs045ylxntt2tm

Vendor Advisories for CVE-2026-41635(12)

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

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatmina-core2026-05-14redhat

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

(7 across 5 ecosystems)
Debian:11(2)
PackageVulnerable rangeFix by version rangeDependents
mina1.1.7.dfsg-13, 1.1.7.dfsg-14
  • every version on: no fix on record
—
mina22.1.4-2 ... 2.2.1-4 (7 versions)
  • every version on: no fix on record
—
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
mina1.1.7.dfsg-13, 1.1.7.dfsg-14
  • every version on: no fix on record
—
mina22.2.1-3, 2.2.1-4, 2.2.9-1
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
mina22.2.1-4, 2.2.9-1
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
mina22.2.1-4
  • every version up to 2.2.9-1: fixed in 2.2.9-1
—
Maven(1)
PackageVulnerable rangeFix by version rangeDependents
org.apache.mina:mina-core2.2.0 ... 2.2.5 (6 versions)
  • 2.0.0 up to 2.0.28: fixed in 2.0.28
  • 2.1.0 up to 2.1.11: fixed in 2.1.11
  • 2.2.0 up to 2.2.6: fixed in 2.2.6
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 23× 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 279 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-41635?
CVE-2026-41635 is a critical vulnerability published on April 27, 2026. Apache MINA's AbstractIoBuffer.resolveClass() contains two branches, one of them (for static classes or primitive types) does not check the class at all, bypassing the classname allowlist and allowing arbitrary code to be executed. The fix checks if the class is present in the accepted class filter…
When was CVE-2026-41635 disclosed?
CVE-2026-41635 was first published on April 27, 2026, with the most recent update on April 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-41635 actively exploited?
CVE-2026-41635 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.8% probability of exploitation in the next 30 days (55th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-41635?
CVE-2026-41635 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-41635?
A fix for CVE-2026-41635 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-41635 are linked in the Vendor Advisories panel on this page.

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