CVE-2026-45447

HIGHPre-NVD 8.89.8▲
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-09. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.8; sources differ by 1.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 3%CVSS: 8.8Exploit: NoneExposed: 0

A fix is available — apply it.

Issue summary: A specially crafted PKCS#7 or S/MIME signed message could trigger a use-after-free during PKCS#7 signature verification.

Impact summary: A use-after-free may result in process crashes, heap corruption, or potentially remote code execution.

When processing a PKCS#7 or S/MIME signed message, if the SignedData digestAlgorithms field is present as an empty ASN.1 SET, OpenSSL may incorrectly free a caller-owned BIO during PKCS7_verify(). A subsequent use of the BIO by the calling application results in a use-after-free condition.

In the common case this occurs when the application later calls BIO_free() on the BIO originally passed to PKCS7_verify(). Depending on allocator behavior and application-specific BIO usage patterns, this may result in a crash or other memory corruption. In some application contexts this may potentially be exploitable for remote code execution.

Applications that process PKCS#7 or S/MIME signed messages using OpenSSL PKCS#7 APIs may be affected. Applications using the CMS APIs for this processing are not 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
8.8
EG Score
9.8(medium)
EPSS
84.5%
KEV
Not listed

Published

June 9, 2026

Last Modified

July 20, 2026

Advisory Details (1)

Auto-updated Jun 9, 2026
No patch confirmed yet.
generic
https://openssl-library.org/news/secadv/20260609.txt

Vendor Advisories for CVE-2026-45447(14)

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

Patch Availability(14)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuopenssl (1.0.2g-1ubuntu4.20+esm16) @ xenial2026-07-16ubuntu
ubuntuopenssl-provider-legacy (3.5.3-1ubuntu3.4) @ questing2026-07-16ubuntu
redhatcostmanagement/costmanagement-metrics-rhel9-operator:17835391562026-07-15redhat
redhatcompat-openssl11-1:1.1.1k-4.el9_2.22026-07-13redhat
redhatcompat-openssl11-1:1.1.1k-5.el9_4.32026-07-13redhat
redhatcompat-openssl10-1:1.0.2o-4.el8_10.32026-07-07redhat
redhatcompat-openssl10-1:1.0.2o-4.el8_8.12026-07-07redhat
redhatcompat-openssl11-1:1.1.1k-5.el9_6.32026-07-06redhat
redhatinsights-proxy/insights-proxy-container-rhel9:17828905032026-07-01redhat
redhatdiscovery/discovery-ui-rhel9:17821669522026-06-24redhat
redhatopenssl-1:1.1.1k-16.el8_62026-06-16redhat
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(2)

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 15× in last 7d / 227× 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 363 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-45447?
CVE-2026-45447 is a high vulnerability published on June 9, 2026. Issue summary: A specially crafted PKCS#7 or S/MIME signed message could trigger a use-after-free during PKCS#7 signature verification. Impact summary: A use-after-free may result in process crashes, heap corruption, or potentially remote code execution. When processing a PKCS#7 or S/MIME signed…
When was CVE-2026-45447 disclosed?
CVE-2026-45447 was first published in the National Vulnerability Database on June 9, 2026, with the most recent update on July 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45447 actively exploited?
CVE-2026-45447 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 84.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-45447?
CVE-2026-45447 has a CVSS v3.1 base score of 8.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.8.
How do I remediate CVE-2026-45447?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45447, 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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