Riskcovery

CVE-2026-27651

NGINX ngx_mail_auth_http_module vulnerability

State
Published
Severity
8.7 High
Published
Mar 24, 2026
Updated
Jul 15, 2026
Reserved
Mar 18, 2026

Read the record on cve.org

Description

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.

Scores

CVSSScoreVectorSource
4.08.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:Nf5
3.17.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hf5
3.17.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hredhat-SADP

Weaknesses

Affected Products

ProductVersions
NGINX Open SourceF5
  • 1.29.0 to before 1.29.7Affected
  • 0.5.15 to before 1.28.3Affected
NGINX PlusF5
  • R36 to before R36 P3Affected
  • R35 to before R35 P2Affected
  • R34 and laterAffected
  • R33 and laterAffected
  • R32 to before R32 P5Affected

References

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