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
5.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 5.9Exploit: None knownExposed: 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 PROB
1%
EPSS %ILE
62%
KEV
Not listed

Published

June 9, 2026

Last Modified

July 23, 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) @ xenial2026-08-20ubuntu
ubuntuopenssl-provider-legacy (3.5.5-1ubuntu3.2) @ resolute2026-08-20ubuntu
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.

Affected Packages

(7 across 7 ecosystems)
Alpine:v3.22(1)
PackageVulnerable rangeFixed inDependents
openssl—3.5.7-r0—
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
openssl—3.5.7-r0—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
openssl—3.5.7-r0—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
openssl1.1.1k-1 ... 1.1.1w-0~deb11u1 (23 versions)1.1.1w-0+deb11u8—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
openssl3.0.10-1 ... 3.0.9-1 (22 versions)3.0.20-1~deb12u2—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
openssl3.5.1-1 ... 3.5.6-1~deb13u1 (11 versions)3.5.6-1~deb13u2—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
openssl3.5.1-1 ... 3.6.2-1 (19 versions)3.6.3-1—

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 18× in last 7d / 98× 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 210 total refreshes for this CVE.

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

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 July 23, 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 1% probability of exploitation in the next 30 days, which ranks it in the top 38.1% of all scored CVEs.
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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