CVE-2026-28389

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-04-08. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.5Exploit: NoneExposed: 0

A fix is available — apply it.

Issue summary: During processing of a crafted CMS EnvelopedData message with KeyAgreeRecipientInfo a NULL pointer dereference can happen.

Impact summary: Applications that process attacker-controlled CMS data may crash before authentication or cryptographic operations occur resulting in Denial of Service.

When a CMS EnvelopedData message that uses KeyAgreeRecipientInfo is processed, the optional parameters field of KeyEncryptionAlgorithmIdentifier is examined without checking for its presence. This results in a NULL pointer dereference if the field is missing.

Applications and services that call CMS_decrypt() on untrusted input (e.g., S/MIME processing or CMS-based protocols) are vulnerable.

The FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
59.7%
KEV
Not listed

Published

April 7, 2026

Last Modified

May 12, 2026

Advisory Details (8)

Auto-updated Jun 11, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

SSA-265688

https://cert-portal.siemens.com/productcert/html/ssa-265688.html
generic

SSA-032379

https://cert-portal.siemens.com/productcert/html/ssa-032379.html
generic
https://openssl-library.org/news/secadv/20260407.txt
github_commit

commit f80f83bc5fd0 (openssl/openssl)

Fix landed in openssl/openssl commit f80f83bc5fd0 — awaiting tagged release

https://github.com/openssl/openssl/commit/f80f83bc5fd036bc47d773e8b15a001e2b4ce686
github_commit

commit c6725634e089 (openssl/openssl)

Fix landed in openssl/openssl commit c6725634e089 — awaiting tagged release

https://github.com/openssl/openssl/commit/c6725634e089eb2b634b10ede33944be7248172a
github_commit

commit 7b5274e81240 (openssl/openssl)

Fix landed in openssl/openssl commit 7b5274e81240 — awaiting tagged release

https://github.com/openssl/openssl/commit/7b5274e812400cacb6f3be4c2df5340923fa807f
github_commit

commit 785cbf7ea3b5 (openssl/openssl)

Fix landed in openssl/openssl commit 785cbf7ea3b5 — awaiting tagged release

https://github.com/openssl/openssl/commit/785cbf7ea3b5a6f5adf0c1ccb92b79d89c35c616
github_commit

commit 16cea4188e0e (openssl/openssl)

Fix landed in openssl/openssl commit 16cea4188e0e — awaiting tagged release

https://github.com/openssl/openssl/commit/16cea4188e0ea567deb4f93f85902247e67384f5

Vendor Advisories for CVE-2026-28389(2)

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

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuopenssl (3.0.2-0ubuntu1.23) @ jammy2026-06-11ubuntu
ubuntuopenssl (1.0.1f-1ubuntu2.27+esm13) @ trusty2026-06-11ubuntu
redhatopenssl-main-3.5.6-0.1.hum12026-04-09redhat

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 12× in last 7d / 45× 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 118 total refreshes for this CVE.

  1. 2026-07-17 01:13 UTCOSV refresh
  2. 2026-07-16 17:03 UTCEPSS rescore
  3. 2026-07-16 17:03 UTCEPSS rescore
  4. 2026-07-15 16:57 UTCEPSS rescore
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  11. 2026-07-12 05:46 UTCEPSS rescore
  12. 2026-07-11 08:27 UTCEPSS rescore
  13. 2026-07-09 19:10 UTCEPSS rescore
  14. 2026-07-08 15:15 UTCEPSS rescore
  15. 2026-07-07 13:46 UTCEPSS rescore
  16. 2026-07-06 16:27 UTCEPSS rescore
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  18. 2026-07-06 02:23 UTCEPSS rescore
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  20. 2026-07-05 02:30 UTCEPSS rescore
  21. 2026-07-04 06:31 UTCEPSS rescore
  22. 2026-07-01 15:06 UTCEPSS rescore
  23. 2026-06-30 23:22 UTCEPSS rescore
  24. 2026-06-30 23:22 UTCEPSS rescore
  25. 2026-06-29 14:06 UTCEPSS rescore
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  1. 2026-06-28 14:07 UTCEPSS rescore
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  3. 2026-06-28 04:56 UTCEPSS rescore
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  5. 2026-06-27 03:08 UTCEPSS rescore
  6. 2026-06-25 13:49 UTCEPSS rescore
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  8. 2026-06-24 14:05 UTCEPSS rescore
  9. 2026-06-24 14:05 UTCEPSS rescore
  10. 2026-06-23 21:33 UTCEPSS rescore
  11. 2026-06-23 21:32 UTCEPSS rescore
  12. 2026-06-22 14:25 UTCEPSS rescore
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  18. 2026-06-19 19:25 UTCEPSS rescore
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  20. 2026-06-18 17:52 UTCEPSS rescore
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  23. 2026-06-16 17:52 UTCEPSS rescore
  24. 2026-06-15 17:48 UTCEPSS rescore
  25. 2026-06-14 23:18 UTCEPSS rescore
  26. 2026-06-13 23:00 UTCEPSS rescore
  27. 2026-06-12 23:12 UTCEPSS rescore
  28. 2026-06-12 23:12 UTCEPSS rescore
  29. 2026-06-11 21:16 UTCVendor advisory
  30. 2026-06-11 21:16 UTCGHSA enrichment
  31. 2026-06-11 14:00 UTCEPSS rescore
  32. 2026-06-10 22:18 UTCEPSS rescore
  33. 2026-06-10 22:18 UTCEPSS rescore
  34. 2026-06-10 13:22 UTCEPSS rescore
  35. 2026-06-10 12:47 UTCVendor advisory
  36. 2026-06-10 12:47 UTCGHSA enrichment
  37. 2026-06-10 01:15 UTCVendor advisory
  38. 2026-06-10 01:15 UTCGHSA enrichment
  39. 2026-06-09 13:46 UTCVendor advisory
  40. 2026-06-09 13:46 UTCGHSA enrichment
  41. 2026-06-08 14:17 UTCEPSS rescore
  42. 2026-06-08 14:17 UTCEPSS rescore
  43. 2026-06-08 09:08 UTCVendor advisory
  44. 2026-06-08 09:08 UTCGHSA enrichment
  45. 2026-06-07 21:36 UTCVendor advisory
  46. 2026-06-07 21:36 UTCGHSA enrichment
  47. 2026-06-07 15:25 UTCEPSS rescore
  48. 2026-06-07 15:25 UTCEPSS rescore
  49. 2026-06-07 15:25 UTCEPSS rescore
  50. 2026-06-07 10:06 UTCVendor advisory
  51. 2026-06-07 10:06 UTCGHSA enrichment
  52. 2026-06-06 13:47 UTCEPSS rescore
  53. 2026-06-06 13:47 UTCEPSS rescore
  54. 2026-06-05 22:47 UTCEPSS rescore
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  56. 2026-06-05 06:10 UTCEPSS rescore
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  60. 2026-06-02 20:13 UTCEPSS rescore
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  64. 2026-05-31 22:30 UTCEPSS rescore
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  66. 2026-05-31 00:16 UTCEPSS rescore
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  68. 2026-05-29 13:44 UTCEPSS rescore
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  70. 2026-05-28 13:44 UTCEPSS rescore
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  73. 2026-05-27 13:40 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2026-28389?
CVE-2026-28389 is a high vulnerability published on April 7, 2026. Issue summary: During processing of a crafted CMS EnvelopedData message with KeyAgreeRecipientInfo a NULL pointer dereference can happen. Impact summary: Applications that process attacker-controlled CMS data may crash before authentication or cryptographic operations occur resulting in Denial of…
When was CVE-2026-28389 disclosed?
CVE-2026-28389 was first published in the National Vulnerability Database on April 7, 2026, with the most recent update on May 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-28389 actively exploited?
CVE-2026-28389 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 59.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-28389?
CVE-2026-28389 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-28389?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-28389, 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.

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