CVE-2026-45447

CRITICALPre-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 — 4 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 5%CVSS: 8.8Exploit: None knownExposed: 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)
EG Risk
46(Track)
EG Risk 46/100SSVC: 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
Severity98% × 45%
Exploitation5% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
5%
EPSS %ILE
92%
KEV
Not listed

Published

June 9, 2026

Last Modified

August 17, 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(17)

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

Patch Availability(17)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuopenssl (1.0.1f-1ubuntu2.27+esm14) @ trusty2026-08-21ubuntu
ubuntuopenssl-provider-legacy (3.5.5-1ubuntu3.2) @ resolute2026-08-21ubuntu
redhatmulticluster-engine/console-mce-rhel9:17850786042026-07-29redhat
redhatrhacm2/console-rhel9:17850785812026-07-29redhat
redhatcompat-openssl11-1:1.1.1k-5.el9_8.42026-07-23redhat
redhatcostmanagement/costmanagement-metrics-rhel9-operator:17835391562026-07-15redhat
redhatcompat-openssl11-1:1.1.1k-5.el9_4.32026-07-13redhat
redhatcompat-openssl11-1:1.1.1k-4.el9_2.22026-07-13redhat
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
redhatrhui5/rhua-rhel9:17815257392026-06-16redhat
redhatopenssl-1:1.1.1k-16.el8_62026-06-16redhat
redhatopenssl-1:3.5.5-4.el10_22026-06-11redhat
redhatopenssl-1:3.5.5-4.el9_82026-06-11redhat

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(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 65× in last 7d / 291× 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 653 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-45447?
CVE-2026-45447 is a critical 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 August 17, 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 5% probability of exploitation in the next 30 days, which ranks it in the top 8.1% of all scored CVEs.
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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