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
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 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 PROB
0%
EPSS %ILE
23%
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.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
libcrypt-pbkdf2-perl0.161520-1, 0.161520-2, 0.261630-1, 0.261630-1~deb13u1, 0.261630-1~deb13u1~deb12u1——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
libcrypt-pbkdf2-perl0.161520-20.261630-1~deb13u1~deb12u1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libcrypt-pbkdf2-perl0.161520-2, 0.261630-1~deb13u1~deb12u10.261630-1~deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libcrypt-pbkdf2-perl0.161520-2, 0.261630-1~deb13u1, 0.261630-1~deb13u1~deb12u10.261630-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 19× in last 7d / 98× 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 210 total refreshes for this CVE.

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

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 0% probability of exploitation in the next 30 days, which ranks it in the top 77.5% of all scored CVEs.
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.

Dependency Blast Radius

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