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
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 5.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
5.3MEDIUMmedium confidence
EG Risk
28
EG Risk 28/100

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
Severity53% × 45%
Exploitation0% × 40%
Automatability30% × 15%
EPSS PROB
0.3%
EPSS %ILE
19th
KEV
Not listed

Published

June 12, 2026

Last Modified

June 14, 2026

Advisory Details (7)

Auto-updated Jun 14, 2026
Patch available.
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 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 203 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 10:01 UTCEG score recompute
  28. 2026-08-23 10:01 UTCGHSA enrichment
  29. 2026-08-23 00:19 UTCEPSS rescore
  30. 2026-08-21 23:49 UTCEPSS rescore
  31. 2026-08-21 19:13 UTCEG score recompute
  32. 2026-08-21 19:13 UTCGHSA enrichment
  33. 2026-08-20 22:56 UTCEPSS rescore
  34. 2026-08-20 16:28 UTCEG score recompute
  35. 2026-08-20 16:28 UTCGHSA enrichment
  36. 2026-08-19 17:04 UTCEPSS rescore
  37. 2026-08-19 13:44 UTCEG score recompute
  38. 2026-08-19 13:44 UTCGHSA enrichment
  39. 2026-08-17 13:47 UTCEPSS rescore
  40. 2026-08-16 22:50 UTCEG score recompute
  41. 2026-08-16 22:50 UTCGHSA enrichment
  42. 2026-08-16 14:56 UTCEPSS rescore
  43. 2026-08-16 02:15 UTCEPSS rescore
  44. 2026-08-15 19:00 UTCEG score recompute
  45. 2026-08-15 19:00 UTCGHSA enrichment
  46. 2026-08-15 01:31 UTCEPSS rescore
  47. 2026-08-14 16:57 UTCEG score recompute
  48. 2026-08-14 16:57 UTCGHSA enrichment
  49. 2026-08-13 22:00 UTCEPSS rescore
  50. 2026-08-13 14:54 UTCEG score recompute
  51. 2026-08-13 14:54 UTCGHSA enrichment
  52. 2026-08-12 13:51 UTCEPSS rescore
  53. 2026-08-12 12:52 UTCEG score recompute
  54. 2026-08-12 12:52 UTCGHSA enrichment
  55. 2026-08-11 13:43 UTCEPSS rescore
  56. 2026-08-11 10:33 UTCEG score recompute
  57. 2026-08-11 10:33 UTCGHSA enrichment
  58. 2026-08-11 00:00 UTCEPSS rescore
  59. 2026-08-10 08:29 UTCEG score recompute
  60. 2026-08-10 08:29 UTCGHSA enrichment
  61. 2026-08-09 13:47 UTCEPSS rescore
  62. 2026-08-09 06:27 UTCEG score recompute
  63. 2026-08-09 06:27 UTCGHSA enrichment
  64. 2026-08-08 16:37 UTCEPSS rescore
  65. 2026-08-08 04:25 UTCEG score recompute
  66. 2026-08-08 04:25 UTCGHSA enrichment
  67. 2026-08-07 16:30 UTCEPSS rescore
  68. 2026-08-07 02:22 UTCEG score recompute
  69. 2026-08-07 02:22 UTCGHSA enrichment
  70. 2026-08-06 13:47 UTCEPSS rescore
  71. 2026-08-06 00:20 UTCEG score recompute
  72. 2026-08-06 00:20 UTCGHSA enrichment
  73. 2026-08-05 19:17 UTCEPSS rescore
  74. 2026-08-04 22:17 UTCEG score recompute
  75. 2026-08-04 22:17 UTCGHSA enrichment

Related CVEs(same product + same CWE)

Same product

2 shown

Debian:11:libcrypt-pbkdf2-perl

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 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 0.3% probability of exploitation in the next 30 days (19th percentile of EPSS-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?
A fix for CVE-2026-9641 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-9641 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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