CVE-2026-27651When the ngx_mail_auth_http_module module is enabled on NGINX Plus or NGINX Open Source, undisclosed requests can cause worker processes to terminate.
Updated under an hour ago ()
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It affects f5 nginx_open_source and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-476
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Modified
- Record last updated
- Jul 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
f5 nginx_open_source f5:nginx_open_source | from 0.5.15 through 0.9.7; from 1.0.0 before 1.28.3; from 1.29.0 before 1.29.7 | NVD |
f5 nginx_plus f5:nginx_plus | from r33 before r35; r32; r32; r32; r32; r32; r35; r35; and 3 more ranges | NVD |
References
- https://my.f5.com/manage/s/article/K000160383vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:10065
- https://access.redhat.com/errata/RHSA-2026:13634
- https://access.redhat.com/errata/RHSA-2026:13680
- https://access.redhat.com/errata/RHSA-2026:13839
- https://access.redhat.com/errata/RHSA-2026:14836
- https://access.redhat.com/errata/RHSA-2026:15942
- https://access.redhat.com/errata/RHSA-2026:15943
- https://access.redhat.com/errata/RHSA-2026:15945
- https://access.redhat.com/errata/RHSA-2026:15966
- https://access.redhat.com/errata/RHSA-2026:6906
- https://access.redhat.com/errata/RHSA-2026:6907
- https://access.redhat.com/errata/RHSA-2026:6923
- https://access.redhat.com/errata/RHSA-2026:7002
- https://access.redhat.com/errata/RHSA-2026:7343
- https://access.redhat.com/errata/RHSA-2026:8346
- 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
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.