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
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
7.5HIGHmedium confidence
EG Risk
38
EG Risk 38/100

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%
EPSS PROB
0.5%
EPSS %ILE
40th
KEV
Not listed

Published

June 12, 2026

Last Modified

June 12, 2026

Advisory Details (3)

Auto-updated Jun 12, 2026
Patch available.
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 rangeFix by version rangeDependents
libcrypt-pbkdf2-perl0.161520-1, 0.161520-2, 0.261630-1, 0.261630-1~deb13u1, 0.261630-1~deb13u1~deb12u1
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
libcrypt-pbkdf2-perl0.161520-2
  • every version up to 0.261630-1~deb13u1~deb12u1: fixed in 0.261630-1~deb13u1~deb12u1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
libcrypt-pbkdf2-perl0.161520-2, 0.261630-1~deb13u1~deb12u1
  • every version up to 0.261630-1~deb13u1: fixed in 0.261630-1~deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
libcrypt-pbkdf2-perl0.161520-2, 0.261630-1~deb13u1, 0.261630-1~deb13u1~deb12u1
  • every version up to 0.261630-1: fixed in 0.261630-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 32× 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 257 total refreshes for this CVE.

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

Related CVEs(same product + same CWE)

Same product

2 shown

Debian:11:libcrypt-pbkdf2-perl

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 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 0.5% probability of exploitation in the next 30 days (40th percentile of EPSS-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?
A fix for CVE-2026-9638 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-9638 are linked in the Vendor Advisories panel on this page.

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