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CVE-2026-27651

NGINX ngx_mail_auth_http_module vulnerability

Published: Mar 24, 2026Updated: Jul 15, 2026 Sources: CVE List NVD BDUCWE-476
7.5HIGH
NVD MITRE
EPSS Score
0.9%
Top 42.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-476

Affected Products

NGINX Inc.
commercial·USaka njs, nginx plus, nginx
NGINX Plus
Networking Infrastructure
NGINX Open Source
Networking Infrastructure
F5
commercial·US
NGINX Open SourceOn-premWeb App
Networking Infrastructure / load-balancer-proxy
NGINX PlusOn-premWeb App
Networking Infrastructure / load-balancer-proxy
ООО «Ред Софт»
commercial·RUaka red soft
РЕД ОСOn-premOS
Operating Systems / linux-distro
АО «ИВК»
commercial·RUaka ivk
АЛЬТ СП 10On-premOS
Operating Systems / linux-distro
ООО "Веб-Сервер"
commercial·RUaka angie adc, angie pro, angie
AngieOn-prem
Networking Infrastructure / load-balancer-proxy
and 3 more affected products View all →

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

2 techniques
Impact
Initial Access
View detailed technique mapping

References

https://my.f5.com/manage/s/article/K000160383
my.f5.com
https://angie.software/angie/docs/oss_changes/#angie
angie.software
https://altsp.su/obnovleniya-bezopasnosti/
altsp.su
and 21 more references View all →

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