CVE-2026-27651 | BDVDB-2026-322271 Detail
F5NGINX Open Source
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.
Impact#
Per CVSS v3.1: confidentiality impact none, integrity impact none, availability impact high. Attack vector: network.
Weaknesses#
- CWE-476 NULL Pointer Dereference
References#
- https://my.f5.com/manage/s/article/K000160383
- https://access.redhat.com/security/cve/CVE-2026-27651
- https://bugzilla.redhat.com/show_bug.cgi?id=2450791
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27651.json
- https://access.redhat.com/errata/RHSA-2026:13634
- https://access.redhat.com/errata/RHSA-2026:6906
- https://access.redhat.com/errata/RHSA-2026:6907
- https://access.redhat.com/errata/RHSA-2026:15942
- https://access.redhat.com/errata/RHSA-2026:14836
- https://access.redhat.com/errata/RHSA-2026:13839
- https://access.redhat.com/errata/RHSA-2026:15943
- https://access.redhat.com/errata/RHSA-2026:15945
- https://access.redhat.com/errata/RHSA-2026:13680
- https://access.redhat.com/errata/RHSA-2026:15966
- https://access.redhat.com/errata/RHSA-2026:6923
Exploit#
No public exploit known
History#
- Version 1Record published in the CVE List.
- Version 2Most recent update recorded in the CVE List.