Description
NGINX Open Source and NGINX Plus have a vulnerability in the ngx_mail_smtp_module that might allow an unauthenticated attacker to over-read NGINX SMTP authentication process memory; as a result, the server side may leak arbitrary bytes sent in a request to the authentication server. This issue happens during the NGINX SMTP authentication process and requires the attacker to make preparations against the target system to extract the leaked data. The issue affects NGINX only if (1) it is built with the ngx_mail_smtp_module, (2) the smtp_auth directive is configured with method "none," and (3) the authentication server returns the "Auth-Wait" response header.
Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| F5 | NGINX Plus | R34 – < R34 P2, R33 – < R33 P3, R32 – < R32 P3, R31, R30 | R35 |
| F5 | NGINX Open Source | 0.7 – < 1.29.1 | 1.29.1 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | nginx | 1.28.0-3 | — |
| Debian 13 | nginx | 1.26.3-3+deb13u1 | — |
| Debian 12 | nginx | 1.22.1-9+deb12u3 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 25.10 | nginx | 1.26.3-3ubuntu3 | — |
| Ubuntu 24.04 LTS | nginx | 1.24.0-2ubuntu7.5 | USN-7715-1 |
| Ubuntu 22.04 LTS | nginx | 1.18.0-6ubuntu14.7 | USN-7715-1 |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | nginx | 1.18.0-0ubuntu1.7+esm1 | — |
| Ubuntu Pro 18.04 LTS | nginx | 1.14.0-0ubuntu1.11+esm2 | — |
| Ubuntu Pro 16.04 LTS | nginx | 1.10.3-0ubuntu0.16.04.5+esm7 | — |
| Ubuntu Pro 14.04 LTS | nginx | 1.4.6-1ubuntu3.9+esm6 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | nginx +11 | 1.30.0-1.hum1 | RHSA-2026:8346 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | nginx | 1.29.1-1.1 | openSUSE-SU-2025:15449-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | nginx | 1.28.2-r0 | — |
| Alpine v3.23 | nginx | 1.28.2-r0 | — |
| Alpine v3.22 | nginx | 1.28.2-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | nginx +9 | 1:1.28.0-1.amzn2023.0.2 | ALAS2023-2025-1152 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | nginx | 1.25.4-5 | — |
| Azure Linux 2 (CBL-Mariner) | nginx | 1.22.1-14 | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | nginx-stable +16 | 1.30.0-r0 | — |
Advisories 6
- WID-SEC-2026-2933 Splunk SOAR: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 2, 2026
- RHSA-2026:8346 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 10, 2026
- WID-SEC-2025-1817 NGINX: Schwachstelle ermöglicht Offenlegung von Informationen BSI CERT-Bund (WID) · Aug 16, 2026
- USN-7715-1 nginx vulnerability Ubuntu Security Notices (USN) · Apr 27, 2026
- openSUSE-SU-2025:15449-1 nginx-1.29.1-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- ALAS2023-2025-1152 Low: nginx security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Aug 25, 2025
References
- https://my.f5.com/manage/s/article/K000152786 vendor-advisory