CVE-2026-8721

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-17. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Crypt::OpenSSL::PKCS12 versions through 1.94 for Perl truncates passwords with embedded NULLs.

Password parameters in PKCS12.xs are declared char *, which routes through Perl's default typemap to SvPV_nolen. The Perl length is discarded.

The C code (or OpenSSL internally) calls strlen() on the buffer. Any password byte at or after the first NULL is silently dropped. Binary / KDF-derived / HMAC-derived passwords lose entropy without any warnings.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
—
EPSS
36.5%
KEV
Not listed

Published

May 17, 2026

Last Modified

May 18, 2026

Advisory Details (2)

Auto-updated Jun 21, 2026
No patch confirmed yet.
generic

oss-security - CVE-2026-8721: Crypt::OpenSSL::PKCS12 versions through 1.94 for Perl truncates passwords with embedded NULLs

http://www.openwall.com/lists/oss-security/2026/05/17/6
generic

Client Challenge

https://metacpan.org/release/JONASBN/Crypt-OpenSSL-PKCS12-1.95/view/Changes.md

Vendor Advisories for CVE-2026-8721(1)

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

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 47× 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 189 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-8721?
CVE-2026-8721 is a critical vulnerability published on May 17, 2026. Crypt::OpenSSL::PKCS12 versions through 1.94 for Perl truncates passwords with embedded NULLs. Password parameters in PKCS12.xs are declared char *, which routes through Perl's default typemap to SvPV_nolen. The Perl length is discarded. The C code (or OpenSSL internally) calls strlen() on the…
When was CVE-2026-8721 disclosed?
CVE-2026-8721 was first published in the National Vulnerability Database on May 17, 2026, with the most recent update on May 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8721 actively exploited?
CVE-2026-8721 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 36.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-8721?
CVE-2026-8721 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-8721?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8721, 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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