CVE-2026-9641

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2026-06-12. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: 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 have a weak default algorithm and number of iterations.

The default algorithm is HMAC-SHA1, which should only be used for legacy systems.

These versions default to using 1000 iterations.

Depending on the chosen algorithm, 220,000 to 1,400,000 iterations should be used.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
28(Track)
EG Risk 28/100SSVC: 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
Severity53% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
13%
KEV
Not listed

Published

June 12, 2026

Last Modified

June 14, 2026

Advisory Details (7)

Auto-updated Jun 14, 2026
No patch confirmed yet.
generic

oss-security - Re: CVE-2026-9641: Crypt::PBKDF2 versions before 0.261630 for Perl have a weak default algorithm and number of iterations

http://www.openwall.com/lists/oss-security/2026/06/14/3
generic

oss-security - Re: CVE-2026-9641: Crypt::PBKDF2 versions before 0.261630 for Perl have a weak default algorithm and number of iterations

http://www.openwall.com/lists/oss-security/2026/06/14/2
generic

oss-security - Re: CVE-2026-9641: Crypt::PBKDF2 versions before 0.261630 for Perl have a weak default algorithm and number of iterations

http://www.openwall.com/lists/oss-security/2026/06/14/1
generic

oss-security - Re: CVE-2026-9641: Crypt::PBKDF2 versions before 0.261630 for Perl have a weak default algorithm and number of iterations

http://www.openwall.com/lists/oss-security/2026/06/13/1
generic

oss-security - CVE-2026-9641: Crypt::PBKDF2 versions before 0.261630 for Perl have a weak default algorithm and number of iterations

http://www.openwall.com/lists/oss-security/2026/06/12/5
generic

Client Challenge

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

Password Storage - OWASP Cheat Sheet Series

https://cheatsheetseries.owasp.org/cheatsheets/Password_Storage_Cheat_Sheet.html#pbkdf2

Vendor Advisories for CVE-2026-9641(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 16× in last 7d / 76× 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 156 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 10:01 UTCEG score recompute
  6. 2026-08-23 10:01 UTCGHSA enrichment
  7. 2026-08-23 00:19 UTCEPSS rescore
  8. 2026-08-21 23:49 UTCEPSS rescore
  9. 2026-08-21 19:13 UTCEG score recompute
  10. 2026-08-21 19:13 UTCGHSA enrichment
  11. 2026-08-20 22:56 UTCEPSS rescore
  12. 2026-08-20 16:28 UTCEG score recompute
  13. 2026-08-20 16:28 UTCGHSA enrichment
  14. 2026-08-19 17:04 UTCEPSS rescore
  15. 2026-08-19 13:44 UTCEG score recompute
  16. 2026-08-19 13:44 UTCGHSA enrichment
  17. 2026-08-17 13:47 UTCEPSS rescore
  18. 2026-08-16 22:50 UTCEG score recompute
  19. 2026-08-16 22:50 UTCGHSA enrichment
  20. 2026-08-16 14:56 UTCEPSS rescore
  21. 2026-08-16 02:15 UTCEPSS rescore
  22. 2026-08-15 19:00 UTCEG score recompute
  23. 2026-08-15 19:00 UTCGHSA enrichment
  24. 2026-08-15 01:31 UTCEPSS rescore
  25. 2026-08-14 16:57 UTCEG score recompute
Show 75 more
  1. 2026-08-14 16:57 UTCGHSA enrichment
  2. 2026-08-13 22:00 UTCEPSS rescore
  3. 2026-08-13 14:54 UTCEG score recompute
  4. 2026-08-13 14:54 UTCGHSA enrichment
  5. 2026-08-12 13:51 UTCEPSS rescore
  6. 2026-08-12 12:52 UTCEG score recompute
  7. 2026-08-12 12:52 UTCGHSA enrichment
  8. 2026-08-11 13:43 UTCEPSS rescore
  9. 2026-08-11 10:33 UTCEG score recompute
  10. 2026-08-11 10:33 UTCGHSA enrichment
  11. 2026-08-11 00:00 UTCEPSS rescore
  12. 2026-08-10 08:29 UTCEG score recompute
  13. 2026-08-10 08:29 UTCGHSA enrichment
  14. 2026-08-09 13:47 UTCEPSS rescore
  15. 2026-08-09 06:27 UTCEG score recompute
  16. 2026-08-09 06:27 UTCGHSA enrichment
  17. 2026-08-08 16:37 UTCEPSS rescore
  18. 2026-08-08 04:25 UTCEG score recompute
  19. 2026-08-08 04:25 UTCGHSA enrichment
  20. 2026-08-07 16:30 UTCEPSS rescore
  21. 2026-08-07 02:22 UTCEG score recompute
  22. 2026-08-07 02:22 UTCGHSA enrichment
  23. 2026-08-06 13:47 UTCEPSS rescore
  24. 2026-08-06 00:20 UTCEG score recompute
  25. 2026-08-06 00:20 UTCGHSA enrichment
  26. 2026-08-05 19:17 UTCEPSS rescore
  27. 2026-08-04 22:17 UTCEG score recompute
  28. 2026-08-04 22:17 UTCGHSA enrichment
  29. 2026-08-04 15:10 UTCEPSS rescore
  30. 2026-08-04 10:39 UTCEPSS rescore
  31. 2026-08-03 19:44 UTCEG score recompute
  32. 2026-08-03 19:44 UTCGHSA enrichment
  33. 2026-08-03 10:36 UTCEPSS rescore
  34. 2026-08-02 17:38 UTCEG score recompute
  35. 2026-08-02 17:38 UTCGHSA enrichment
  36. 2026-08-02 02:27 UTCEPSS rescore
  37. 2026-08-01 15:35 UTCEG score recompute
  38. 2026-08-01 15:35 UTCGHSA enrichment
  39. 2026-08-01 04:16 UTCEPSS rescore
  40. 2026-07-31 13:32 UTCEG score recompute
  41. 2026-07-31 13:32 UTCGHSA enrichment
  42. 2026-07-30 16:28 UTCEPSS rescore
  43. 2026-07-30 09:25 UTCEG score recompute
  44. 2026-07-30 09:25 UTCGHSA enrichment
  45. 2026-07-30 01:30 UTCEPSS rescore
  46. 2026-07-29 04:19 UTCEG score recompute
  47. 2026-07-29 04:19 UTCGHSA enrichment
  48. 2026-07-28 15:37 UTCEPSS rescore
  49. 2026-07-28 02:06 UTCEG score recompute
  50. 2026-07-28 02:06 UTCGHSA enrichment
  51. 2026-07-27 14:14 UTCEPSS rescore
  52. 2026-07-26 20:37 UTCEG score recompute
  53. 2026-07-26 20:37 UTCGHSA enrichment
  54. 2026-07-26 14:54 UTCEPSS rescore
  55. 2026-07-25 14:18 UTCEPSS rescore
  56. 2026-07-24 14:18 UTCEPSS rescore
  57. 2026-07-23 14:18 UTCEPSS rescore
  58. 2026-07-23 03:23 UTCEG score recompute
  59. 2026-07-22 14:08 UTCEPSS rescore
  60. 2026-07-21 15:25 UTCEPSS rescore
  61. 2026-07-21 15:25 UTCEPSS rescore
  62. 2026-07-20 17:08 UTCEPSS rescore
  63. 2026-07-19 14:31 UTCEPSS rescore
  64. 2026-07-19 02:29 UTCEPSS rescore
  65. 2026-07-18 10:04 UTCEPSS rescore
  66. 2026-07-17 06:15 UTCGHSA enrichment
  67. 2026-07-16 17:03 UTCEPSS rescore
  68. 2026-07-16 00:41 UTCGHSA enrichment
  69. 2026-07-15 16:57 UTCEPSS rescore
  70. 2026-07-15 02:00 UTCEPSS rescore
  71. 2026-07-14 22:38 UTCGHSA enrichment
  72. 2026-07-13 22:31 UTCEPSS rescore
  73. 2026-07-13 20:05 UTCGHSA enrichment
  74. 2026-07-13 06:13 UTCEPSS rescore
  75. 2026-07-12 17:48 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-9641?
CVE-2026-9641 is a medium vulnerability published on June 12, 2026. Crypt::PBKDF2 versions before 0.261630 for Perl have a weak default algorithm and number of iterations. The default algorithm is HMAC-SHA1, which should only be used for legacy systems. These versions default to using 1000 iterations. Depending on the chosen algorithm, 220,000 to 1,400,000…
When was CVE-2026-9641 disclosed?
CVE-2026-9641 was first published in the National Vulnerability Database on June 12, 2026, with the most recent update on June 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-9641 actively exploited?
CVE-2026-9641 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 87.0% of all scored CVEs.
What is the CVSS score of CVE-2026-9641?
CVE-2026-9641 has a CVSS v3.1 base score of 5.3 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-9641?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-9641, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-9641

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