NGINX ngx_mail_auth_http_module vulnerability
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.
01
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-27651US | — | — | ||
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)… | ||||
02
references
External citations — patches, advisories, analysis.
- https://access.redhat.com/errata/RHSA-2026:10065WEB
- https://access.redhat.com/errata/RHSA-2026:13634WEB
- https://access.redhat.com/errata/RHSA-2026:13680WEB
- https://access.redhat.com/errata/RHSA-2026:13839WEB
- https://access.redhat.com/errata/RHSA-2026:14836WEB
- https://access.redhat.com/errata/RHSA-2026:15942WEB
- https://access.redhat.com/errata/RHSA-2026:15943WEB
- https://access.redhat.com/errata/RHSA-2026:15945WEB
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