CVE-2026-27651 (GCVE-0-2026-27651)

Vulnerability from cvelistv5 – Published: 2026-03-24 14:13 – Updated: 2026-03-24 15:14
VLAI?
Title
NGINX ngx_mail_auth_http_module vulnerability
Summary
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.
Severity ?
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
f5
References
Impacted products
Vendor Product Version
F5 NGINX Open Source Affected: 1.29.0 , < 1.29.7 (semver)
Affected: 0.5.15 , < 1.28.3 (semver)
Create a notification for this product.
    F5 NGINX Plus Affected: R36 , < R36 P3 (custom)
Affected: R35 , < R35 P2 (custom)
Affected: R34 , < * (custom)
Affected: R33 , < * (custom)
Affected: R32 , < R32 P5 (custom)
Create a notification for this product.
Date Public ?
2026-03-24 14:00
Credits
F5 acknowledges Arkadi Vainbrand for bringing this issue to our attention and following the highest standards of coordinated disclosure.
Show details on NVD website
To clipboard 

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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.