CVE-2026-54411

MEDIUMPre-NVD 5.95.9—
EchelonGraph scoreHIGH confidence

Score 5.9 from GitHub Security Advisory published 2026-06-14. a secondary CVSS source baseline 5.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — Patch released this week
5.9
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.9Exploit: NoneExposed: 0

A fix is available — apply it.

Linux-PAM through 1.7.2 contains an observable timing discrepancy (CWE-208) in the pam_userdb module's plaintext-password comparison path in modules/pam_userdb/pam_userdb.c that allows a local or network-adjacent attacker able to repeatedly drive authentication through a calling service to recover the plaintext password of a target account by measuring response-timing differences. The comparison uses strncmp() (or strncasecmp() when PAM_ICASE_ARG is set) preceded by a length-equality check, so the time to reject a candidate depends on the index of the first differing byte and on whether the candidate's length matches the stored password, leaking the password length and individual prefix bytes. The vulnerable path is reached when the administrator configures pam_userdb with crypt=none, with an unrecognized crypt method, or without a crypt= argument, causing the module to store and compare credentials in plaintext.

CVSS v3
5.9
EG Score
5.9(high)
EPSS
24.0%
KEV
Not listed

Published

June 14, 2026

Last Modified

June 16, 2026

Advisory Details (4)

Auto-updated Jun 15, 2026
No patch confirmed yet.
generic

CWE - CWE-208: Observable Timing Discrepancy (4.20)

https://cwe.mitre.org/data/definitions/208.html
generic

linux-pam/libpam/include/pam_inline.h at master · linux-pam/linux-pam · GitHub

https://github.com/linux-pam/linux-pam/blob/master/libpam/include/pam_inline.h
generic

linux-pam/modules/pam_userdb/pam_userdb.c at master · linux-pam/linux-pam · GitHub

https://github.com/linux-pam/linux-pam/blob/master/modules/pam_userdb/pam_userdb.c#L327
generic

GitHub - linux-pam/linux-pam: Linux PAM (Pluggable Authentication Modules for Linux) project · GitHub

https://github.com/linux-pam/linux-pam

Vendor Advisories for CVE-2026-54411(3)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatpam-main-1.7.2-2.2.hum12026-07-02redhat
redhatpam-main-1.7.2-1.1.hum12026-04-10redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 31× in last 7d / 91× 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.

  1. 2026-07-07 00:43 UTCEG score recompute
  2. 2026-07-07 00:43 UTCVendor advisory
  3. 2026-07-07 00:43 UTCGHSA enrichment
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-06 16:27 UTCEPSS rescore
  6. 2026-07-06 02:23 UTCEPSS rescore
  7. 2026-07-06 02:23 UTCEPSS rescore
  8. 2026-07-05 16:39 UTCEG score recompute
  9. 2026-07-05 16:39 UTCVendor advisory
  10. 2026-07-05 16:38 UTCGHSA enrichment
  11. 2026-07-05 02:31 UTCEPSS rescore
  12. 2026-07-05 02:30 UTCEPSS rescore
  13. 2026-07-04 15:23 UTCEG score recompute
  14. 2026-07-04 15:23 UTCVendor advisory
  15. 2026-07-04 15:23 UTCGHSA enrichment
  16. 2026-07-04 06:31 UTCEPSS rescore
  17. 2026-07-04 06:31 UTCEPSS rescore
  18. 2026-07-03 14:26 UTCEG score recompute
  19. 2026-07-03 14:26 UTCVendor advisory
  20. 2026-07-03 14:26 UTCGHSA enrichment
  21. 2026-07-02 10:22 UTCEG score recompute
  22. 2026-07-02 10:22 UTCVendor advisory
  23. 2026-07-02 10:22 UTCGHSA enrichment
  24. 2026-07-01 15:07 UTCEPSS rescore
  25. 2026-07-01 09:33 UTCEG score recompute
Show 66 more
  1. 2026-07-01 09:33 UTCVendor advisory
  2. 2026-07-01 09:33 UTCGHSA enrichment
  3. 2026-06-30 23:22 UTCEPSS rescore
  4. 2026-06-30 08:44 UTCEG score recompute
  5. 2026-06-30 08:44 UTCVendor advisory
  6. 2026-06-30 08:44 UTCGHSA enrichment
  7. 2026-06-29 14:06 UTCEPSS rescore
  8. 2026-06-29 14:06 UTCEPSS rescore
  9. 2026-06-29 07:49 UTCEG score recompute
  10. 2026-06-29 07:49 UTCVendor advisory
  11. 2026-06-29 07:49 UTCGHSA enrichment
  12. 2026-06-28 14:07 UTCEPSS rescore
  13. 2026-06-28 07:00 UTCEG score recompute
  14. 2026-06-28 07:00 UTCVendor advisory
  15. 2026-06-28 07:00 UTCGHSA enrichment
  16. 2026-06-28 04:56 UTCEPSS rescore
  17. 2026-06-28 04:56 UTCEPSS rescore
  18. 2026-06-27 06:11 UTCEG score recompute
  19. 2026-06-27 06:11 UTCVendor advisory
  20. 2026-06-27 06:11 UTCGHSA enrichment
  21. 2026-06-27 03:08 UTCEPSS rescore
  22. 2026-06-26 05:22 UTCEG score recompute
  23. 2026-06-26 05:22 UTCVendor advisory
  24. 2026-06-26 05:22 UTCGHSA enrichment
  25. 2026-06-25 13:49 UTCEPSS rescore
  26. 2026-06-25 04:34 UTCEG score recompute
  27. 2026-06-25 04:34 UTCVendor advisory
  28. 2026-06-25 04:34 UTCGHSA enrichment
  29. 2026-06-24 14:05 UTCEPSS rescore
  30. 2026-06-24 03:35 UTCEG score recompute
  31. 2026-06-24 03:35 UTCGHSA enrichment
  32. 2026-06-23 21:33 UTCEPSS rescore
  33. 2026-06-23 21:33 UTCEPSS rescore
  34. 2026-06-23 02:45 UTCEG score recompute
  35. 2026-06-23 02:45 UTCGHSA enrichment
  36. 2026-06-22 14:25 UTCEPSS rescore
  37. 2026-06-22 14:25 UTCEPSS rescore
  38. 2026-06-22 01:48 UTCEG score recompute
  39. 2026-06-22 01:47 UTCGHSA enrichment
  40. 2026-06-21 14:56 UTCEPSS rescore
  41. 2026-06-21 14:56 UTCEPSS rescore
  42. 2026-06-21 01:59 UTCEPSS rescore
  43. 2026-06-21 01:59 UTCEPSS rescore
  44. 2026-06-21 00:20 UTCEG score recompute
  45. 2026-06-21 00:20 UTCGHSA enrichment
  46. 2026-06-19 23:23 UTCEG score recompute
  47. 2026-06-19 23:23 UTCGHSA enrichment
  48. 2026-06-19 19:26 UTCEPSS rescore
  49. 2026-06-19 19:26 UTCEPSS rescore
  50. 2026-06-18 22:31 UTCEG score recompute
  51. 2026-06-18 22:31 UTCGHSA enrichment
  52. 2026-06-18 17:52 UTCEPSS rescore
  53. 2026-06-18 17:52 UTCEPSS rescore
  54. 2026-06-17 21:43 UTCEG score recompute
  55. 2026-06-17 21:43 UTCGHSA enrichment
  56. 2026-06-17 17:53 UTCEPSS rescore
  57. 2026-06-16 20:54 UTCEG score recompute
  58. 2026-06-16 20:54 UTCGHSA enrichment
  59. 2026-06-16 17:53 UTCEPSS rescore
  60. 2026-06-15 20:06 UTCEG score recompute
  61. 2026-06-15 20:06 UTCGHSA enrichment
  62. 2026-06-15 17:53 UTCMITRE cvelistV5CVSS v4 → 6.9
  63. 2026-06-15 17:49 UTCEPSS rescore
  64. 2026-06-15 17:49 UTCEPSS rescore
  65. 2026-06-14 19:14 UTCEG score recompute
  66. 2026-06-14 19:14 UTCGHSA enrichment

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-54411?
CVE-2026-54411 is a medium vulnerability published on June 14, 2026. Linux-PAM through 1.7.2 contains an observable timing discrepancy (CWE-208) in the pamuserdb module's plaintext-password comparison path in modules/pamuserdb/pamuserdb.c that allows a local or network-adjacent attacker able to repeatedly drive authentication through a calling service to recover the…
When was CVE-2026-54411 disclosed?
CVE-2026-54411 was first published in the National Vulnerability Database on June 14, 2026, with the most recent update on June 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54411 actively exploited?
CVE-2026-54411 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 24.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-54411?
CVE-2026-54411 has a CVSS v3 base score of 5.9 (NVD).
How do I remediate CVE-2026-54411?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54411, 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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