CVE-2026-27651

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-03-24. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

When the ngx_mail_auth_http_module module is enabled on NGINX Plus or NGINX Open Source, undisclosed requests can cause worker processes to terminate. This issue may occur when (1) CRAM-MD5 or APOP authentication is enabled, and (2) the authentication server permits retry by returning the Auth-Wait response header. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
58%
KEV
Not listed

Published

March 24, 2026

Last Modified

July 15, 2026

Advisory Details (10)

Auto-updated Jul 3, 2026
Patch available. Sources: redhat.
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.6 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:15966
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.6 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:15945
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.4 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:15943
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions.

https://access.redhat.com/errata/RHSA-2026:15942
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions.

https://access.redhat.com/errata/RHSA-2026:14836
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions.

https://access.redhat.com/errata/RHSA-2026:13839
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.6 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:13680
redhat Patch Available

Affected: Red Hat Enterprise Linux 10.0 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:13634
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:10065
generic

myF5

https://my.f5.com/manage/s/article/K000160383

Vendor Advisories for CVE-2026-27651(7)

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

Patch Availability(16)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntunginx-light (1.10.3-0ubuntu0.16.04.5+esm7) @ xenial2026-06-30ubuntu
redhatnginx:1.24-9040020260504195322.92026-05-11redhat
redhatnginx:1.26-9060020260504154614.92026-05-11redhat
redhatnginx:1.24-9060020260504194843.92026-05-11redhat
redhatnginx-1:1.20.1-10.el9_0.32026-05-11redhat
redhatnginx-1:1.20.1-14.el9_2.52026-05-07redhat
redhatnginx-2:1.20.1-22.el9_6.52026-05-05redhat
redhatnginx-2:1.26.3-1.el10_0.82026-05-05redhat
redhatnginx-1:1.20.1-16.el9_4.52026-05-05redhat
redhatrhui5/rhua-rhel9:17768688422026-04-23redhat
redhatnginx-main-1.30.0-1.hum12026-04-15redhat
redhatnginx:1.26-9070020260407080353.92026-04-09redhat
redhatnginx-2:1.20.1-24.el9_7.22026-04-08redhat
redhatnginx:1.24-8100020260401080144.489197e62026-04-07redhat
redhatnginx:1.24-9070020260331134728.92026-04-07redhat
redhatnginx-2:1.26.3-2.el10_1.12026-04-07redhat

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.

Affected Packages

(7 across 7 ecosystems)
Alpine:v3.22(1)
PackageVulnerable rangeFixed inDependents
nginx—1.28.3-r0—
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
nginx—1.28.3-r0—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
nginx—1.28.3-r0—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
nginx1.18.0-6.1 ... 1.18.0-6.1+deb11u5 (6 versions)1.18.0-6.1+deb11u6—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
nginx1.22.1-9, 1.22.1-9+deb12u1, 1.22.1-9+deb12u2, 1.22.1-9+deb12u3, 1.22.1-9+deb12u41.22.1-9+deb12u5—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
nginx1.26.3-3, 1.26.3-3+deb13u1, 1.26.3-3+deb13u21.26.3-3+deb13u3—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
nginx1.26.3-3 ... 1.28.2-4 (14 versions)1.28.3-1—

Weakness Classification(1)

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

Additional Vendor Advisories

(11)

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 6× in last 7d / 67× 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 120 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-27651?
CVE-2026-27651 is a high vulnerability published on March 24, 2026. When the ngxmailauthhttpmodule module is enabled on NGINX Plus or NGINX Open Source, undisclosed requests can cause worker processes to terminate. This issue may occur when (1) CRAM-MD5 or APOP authentication is enabled, and (2) the authentication server permits retry by returning the Auth-Wait…
When was CVE-2026-27651 disclosed?
CVE-2026-27651 was first published in the National Vulnerability Database on March 24, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-27651 actively exploited?
CVE-2026-27651 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 41.6% of all scored CVEs.
What is the CVSS score of CVE-2026-27651?
CVE-2026-27651 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-27651?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-27651, 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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