CVE-2026-9638

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-06-12. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0

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

Crypt::PBKDF2 versions before 0.261630 for Perl generate insecure random values for salts.

These versions use the built-in rand function, which is predictable and unsuitable for cryptography.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
38(Track)
EG Risk 38/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
22.7%
KEV
Not listed

Published

June 12, 2026

Last Modified

June 12, 2026

Advisory Details (3)

Auto-updated Jun 12, 2026
No patch confirmed yet.
generic

oss-security - CVE-2026-9638: Crypt::PBKDF2 versions before 0.261630 for Perl generate insecure random values for salts

http://www.openwall.com/lists/oss-security/2026/06/12/4
generic

Changes - metacpan.org

https://metacpan.org/release/ARODLAND/Crypt-PBKDF2-0.261630/changes
generic

lib/Crypt/PBKDF2.pm - metacpan.org

https://metacpan.org/dist/Crypt-PBKDF2/source/lib/Crypt/PBKDF2.pm#L86-93

Vendor Advisories for CVE-2026-9638(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 10× in last 7d / 75× 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 105 total refreshes for this CVE.

  1. 2026-07-23 03:23 UTCEG score recompute
  2. 2026-07-22 14:08 UTCEPSS rescore
  3. 2026-07-21 15:25 UTCEPSS rescore
  4. 2026-07-21 15:25 UTCEPSS rescore
  5. 2026-07-20 17:08 UTCEPSS rescore
  6. 2026-07-19 14:31 UTCEPSS rescore
  7. 2026-07-19 02:29 UTCEPSS rescore
  8. 2026-07-18 10:04 UTCEPSS rescore
  9. 2026-07-16 23:16 UTCGHSA enrichment
  10. 2026-07-16 17:03 UTCEPSS rescore
  11. 2026-07-16 04:22 UTCGHSA enrichment
  12. 2026-07-15 16:57 UTCEPSS rescore
  13. 2026-07-15 16:19 UTCGHSA enrichment
  14. 2026-07-15 02:00 UTCEPSS rescore
  15. 2026-07-15 01:36 UTCGHSA enrichment
  16. 2026-07-14 12:06 UTCGHSA enrichment
  17. 2026-07-13 23:11 UTCGHSA enrichment
  18. 2026-07-13 22:31 UTCEPSS rescore
  19. 2026-07-13 11:34 UTCGHSA enrichment
  20. 2026-07-13 06:13 UTCEPSS rescore
  21. 2026-07-12 17:48 UTCGHSA enrichment
  22. 2026-07-12 05:46 UTCEPSS rescore
  23. 2026-07-12 02:11 UTCGHSA enrichment
  24. 2026-07-11 14:39 UTCGHSA enrichment
  25. 2026-07-11 08:27 UTCEPSS rescore
Show 75 more
  1. 2026-07-11 02:53 UTCGHSA enrichment
  2. 2026-07-10 13:07 UTCGHSA enrichment
  3. 2026-07-09 21:55 UTCGHSA enrichment
  4. 2026-07-09 19:10 UTCEPSS rescore
  5. 2026-07-09 08:14 UTCGHSA enrichment
  6. 2026-07-08 20:49 UTCGHSA enrichment
  7. 2026-07-08 15:16 UTCEPSS rescore
  8. 2026-07-08 08:54 UTCGHSA enrichment
  9. 2026-07-07 21:24 UTCGHSA enrichment
  10. 2026-07-07 13:46 UTCEPSS rescore
  11. 2026-07-07 01:09 UTCGHSA enrichment
  12. 2026-07-06 16:27 UTCEPSS rescore
  13. 2026-07-06 02:23 UTCEPSS rescore
  14. 2026-07-05 21:37 UTCGHSA enrichment
  15. 2026-07-05 09:44 UTCGHSA enrichment
  16. 2026-07-05 02:31 UTCEPSS rescore
  17. 2026-07-04 22:18 UTCGHSA enrichment
  18. 2026-07-04 10:54 UTCGHSA enrichment
  19. 2026-07-04 06:31 UTCEPSS rescore
  20. 2026-07-03 15:36 UTCGHSA enrichment
  21. 2026-07-03 04:12 UTCGHSA enrichment
  22. 2026-07-02 16:30 UTCGHSA enrichment
  23. 2026-07-02 05:04 UTCGHSA enrichment
  24. 2026-07-01 17:40 UTCGHSA enrichment
  25. 2026-07-01 15:07 UTCEPSS rescore
  26. 2026-07-01 06:15 UTCGHSA enrichment
  27. 2026-06-30 23:22 UTCEPSS rescore
  28. 2026-06-30 18:38 UTCGHSA enrichment
  29. 2026-06-30 07:14 UTCGHSA enrichment
  30. 2026-06-29 19:51 UTCGHSA enrichment
  31. 2026-06-29 14:06 UTCEPSS rescore
  32. 2026-06-29 08:27 UTCGHSA enrichment
  33. 2026-06-28 21:04 UTCGHSA enrichment
  34. 2026-06-28 14:07 UTCEPSS rescore
  35. 2026-06-28 09:41 UTCGHSA enrichment
  36. 2026-06-28 04:56 UTCEPSS rescore
  37. 2026-06-27 22:18 UTCGHSA enrichment
  38. 2026-06-27 10:54 UTCGHSA enrichment
  39. 2026-06-27 03:08 UTCEPSS rescore
  40. 2026-06-26 23:29 UTCGHSA enrichment
  41. 2026-06-26 12:05 UTCGHSA enrichment
  42. 2026-06-25 23:50 UTCGHSA enrichment
  43. 2026-06-25 13:50 UTCEPSS rescore
  44. 2026-06-25 12:27 UTCGHSA enrichment
  45. 2026-06-25 01:03 UTCGHSA enrichment
  46. 2026-06-24 14:05 UTCEPSS rescore
  47. 2026-06-24 13:39 UTCGHSA enrichment
  48. 2026-06-24 02:15 UTCGHSA enrichment
  49. 2026-06-23 21:33 UTCEPSS rescore
  50. 2026-06-23 14:52 UTCGHSA enrichment
  51. 2026-06-23 03:13 UTCGHSA enrichment
  52. 2026-06-22 15:41 UTCGHSA enrichment
  53. 2026-06-22 14:25 UTCEPSS rescore
  54. 2026-06-22 04:10 UTCGHSA enrichment
  55. 2026-06-21 16:47 UTCGHSA enrichment
  56. 2026-06-21 14:56 UTCEPSS rescore
  57. 2026-06-21 04:55 UTCGHSA enrichment
  58. 2026-06-21 01:59 UTCEPSS rescore
  59. 2026-06-20 17:28 UTCGHSA enrichment
  60. 2026-06-20 05:59 UTCGHSA enrichment
  61. 2026-06-19 19:26 UTCEPSS rescore
  62. 2026-06-19 17:36 UTCGHSA enrichment
  63. 2026-06-19 05:58 UTCGHSA enrichment
  64. 2026-06-18 18:28 UTCGHSA enrichment
  65. 2026-06-18 17:52 UTCEPSS rescore
  66. 2026-06-18 06:59 UTCGHSA enrichment
  67. 2026-06-17 18:33 UTCGHSA enrichment
  68. 2026-06-17 17:53 UTCEPSS rescore
  69. 2026-06-17 07:09 UTCGHSA enrichment
  70. 2026-06-16 19:43 UTCGHSA enrichment
  71. 2026-06-16 17:53 UTCEPSS rescore
  72. 2026-06-16 08:19 UTCGHSA enrichment
  73. 2026-06-15 20:54 UTCEG score recompute▲ 7.50
  74. 2026-06-15 20:54 UTCGHSA enrichment
  75. 2026-06-15 17:49 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-9638?
CVE-2026-9638 is a high vulnerability published on June 12, 2026. Crypt::PBKDF2 versions before 0.261630 for Perl generate insecure random values for salts. These versions use the built-in rand function, which is predictable and unsuitable for cryptography.
When was CVE-2026-9638 disclosed?
CVE-2026-9638 was first published in the National Vulnerability Database on June 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-9638 actively exploited?
CVE-2026-9638 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 22.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-9638?
CVE-2026-9638 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-9638?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-9638, 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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