CVE-2026-42766

MEDIUMPre-NVD 5.95.9—
EchelonGraph scoreMEDIUM confidence

Score 5.9 from GitHub Security Advisory published 2026-06-09. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 5.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this week
5.9
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 1%CVSS: 5.9Exploit: NoneExposed: 0

A fix is available — apply it.

Issue summary: A specially crafted password-encrypted CMS message can trigger a NULL pointer dereference during CMS decryption.

Impact summary: This NULL pointer dereference leads to an application crash and a Denial of Service.

The CMS PasswordRecipientInfo.keyDerivationAlgorithm field is defined as OPTIONAL in the ASN.1 specification and may therefore be absent in specially crafted inputs. During the password-based CMS decryption the OpenSSL CMS implementation dereferences this field without first checking whether it was present.

An attacker who supplies such a CMS message to an application performing password-based CMS decryption can trigger an application crash, leading to a Denial of Service.

Applications that process password-encrypted CMS messages may be affected.

The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.

CVSS v3
5.9
EG Score
5.9(medium)
EG Risk
31(Track)
EG Risk 31/100SSVC: 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
Severity59% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
44.8%
KEV
Not listed

Published

June 9, 2026

Last Modified

June 15, 2026

Advisory Details (6)

Auto-updated Jun 13, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic
https://openssl-library.org/news/secadv/20260609.txt
github_commit

commit da26f368732b (openssl/openssl)

Fix landed in openssl/openssl commit da26f368732b — awaiting tagged release

https://github.com/openssl/openssl/commit/da26f368732b83e40e9d356fe61c3d3aaab6d2e8
github_commit

commit ab52d88cb537 (openssl/openssl)

Fix landed in openssl/openssl commit ab52d88cb537 — awaiting tagged release

https://github.com/openssl/openssl/commit/ab52d88cb5374876d59aee3c91f9e4ccce2b7ce4
github_commit

commit 3ff64913615d (openssl/openssl)

Fix landed in openssl/openssl commit 3ff64913615d — awaiting tagged release

https://github.com/openssl/openssl/commit/3ff64913615d648cfbb6a6f1cf5529ae7ea829d7
github_commit

commit 12bc26ffb3a2 (openssl/openssl)

Fix landed in openssl/openssl commit 12bc26ffb3a2 — awaiting tagged release

https://github.com/openssl/openssl/commit/12bc26ffb3a2be728c9b86e1cae277de5b33dfa4
github_commit

commit 056d06c1918f (openssl/openssl)

Fix landed in openssl/openssl commit 056d06c1918f — awaiting tagged release

https://github.com/openssl/openssl/commit/056d06c1918fafbb98c1c85a02e4c47cc4e199ce

Vendor Advisories for CVE-2026-42766(7)

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

Patch Availability(7)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuopenssl (1.0.2g-1ubuntu4.20+esm16) @ xenial2026-07-16ubuntu
ubuntuopenssl-provider-legacy (3.5.5-1ubuntu3.2) @ resolute2026-07-16ubuntu
redhatinsights-proxy/insights-proxy-container-rhel9:17828905032026-07-01redhat
redhatdiscovery/discovery-ui-rhel9:17821669522026-06-24redhat
redhatrhui5/rhua-rhel9:17815257392026-06-16redhat
redhatopenssl-1:3.5.5-4.el9_82026-06-11redhat
redhatopenssl-1:3.5.5-4.el10_22026-06-11redhat

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

(2)

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 10× in last 7d / 73× 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 114 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-42766?
CVE-2026-42766 is a medium vulnerability published on June 9, 2026. Issue summary: A specially crafted password-encrypted CMS message can trigger a NULL pointer dereference during CMS decryption. Impact summary: This NULL pointer dereference leads to an application crash and a Denial of Service. The CMS PasswordRecipientInfo.keyDerivationAlgorithm field is defined…
When was CVE-2026-42766 disclosed?
CVE-2026-42766 was first published in the National Vulnerability Database on June 9, 2026, with the most recent update on June 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42766 actively exploited?
CVE-2026-42766 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 44.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-42766?
CVE-2026-42766 has a CVSS v3.1 base score of 5.9 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-42766?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42766, 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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