Vulnerability · Published Mar 24, 2026 · Assigned by f5
CVE-2026-27654NGINX ngx_http_dav_module vulnerability
High 8.2
In plain English
A high-severity heap buffer overflow in NGINX Open Source from F5. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 25.9% (higher than 98% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)8.2High
Exploit odds (30 days)25.9%top 2.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC
Official description
NGINX Open Source and NGINX Plus have a vulnerability in the ngx_http_dav_module module that might allow an attacker to trigger a buffer overflow to the NGINX worker process; this vulnerability may result in termination of the NGINX worker process or modification of source or destination file names outside the document root. This issue affects NGINX Open Source and NGINX Plus when the configuration file uses DAV module MOVE or COPY methods, prefix location (nonregular expression location configuration), and alias directives. The integrity impact is constrained because the NGINX worker process user has low privileges and does not have access to the entire system. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | nginx | 1:1.24.0-3.module_el8.10.0+4159+021b4a2a.alma.1 | ALSA-2026:6907 |
| AlmaLinux:9 | nginx | 2:1.20.1-24.el9_7.2.alma.1 | ALSA-2026:7002 |
| AlmaLinux:9 | nginx | 1:1.24.0-5.module_el9.7.0+220+47ec8b91.2.alma.1 | ALSA-2026:6923 |
| AlmaLinux:9 | nginx | 2:1.26.3-2.module_el9.7.0+223+9cd7031b.1 | ALSA-2026:7343 |
| AlmaLinux:10 | nginx-all-modules | 2:1.26.3-2.el10_1.1 | ALSA-2026:6906 |
| AlmaLinux:8 | nginx-all-modules | 1:1.24.0-3.module_el8.10.0+4159+021b4a2a.alma.1 | ALSA-2026:6907 |
| AlmaLinux:9 | nginx-all-modules | 1:1.24.0-5.module_el9.7.0+220+47ec8b91.2.alma.1 | ALSA-2026:6923 |
| AlmaLinux:9 | nginx-all-modules | 2:1.26.3-2.module_el9.7.0+223+9cd7031b.1 | ALSA-2026:7343 |
| AlmaLinux:9 | nginx-all-modules | 2:1.20.1-24.el9_7.2.alma.1 | ALSA-2026:7002 |
| AlmaLinux:9 | nginx-core | 2:1.26.3-2.module_el9.7.0+223+9cd7031b.1 | ALSA-2026:7343 |
| AlmaLinux:9 | nginx-core | 1:1.24.0-5.module_el9.7.0+220+47ec8b91.2.alma.1 | ALSA-2026:6923 |
| AlmaLinux:9 | nginx-core | 2:1.20.1-24.el9_7.2.alma.1 | ALSA-2026:7002 |
| AlmaLinux:10 | nginx-filesystem | 2:1.26.3-2.el10_1.1 | ALSA-2026:6906 |
| AlmaLinux:8 | nginx-filesystem | 1:1.24.0-3.module_el8.10.0+4159+021b4a2a.alma.1 | ALSA-2026:6907 |
| AlmaLinux:9 | nginx-filesystem | 2:1.26.3-2.module_el9.7.0+223+9cd7031b.1 | ALSA-2026:7343 |
| AlmaLinux:9 | nginx-filesystem | 2:1.20.1-24.el9_7.2.alma.1 | ALSA-2026:7002 |
| AlmaLinux:9 | nginx-filesystem | 1:1.24.0-5.module_el9.7.0+220+47ec8b91.2.alma.1 | ALSA-2026:6923 |
| AlmaLinux:8 | nginx-mod-devel | 1:1.24.0-3.module_el8.10.0+4159+021b4a2a.alma.1 | ALSA-2026:6907 |
| AlmaLinux:9 | nginx-mod-devel | 2:1.26.3-2.module_el9.7.0+223+9cd7031b.1 | ALSA-2026:7343 |
| AlmaLinux:9 | nginx-mod-devel | 2:1.20.1-24.el9_7.2.alma.1 | ALSA-2026:7002 |
| AlmaLinux:9 | nginx-mod-devel | 1:1.24.0-5.module_el9.7.0+220+47ec8b91.2.alma.1 | ALSA-2026:6923 |
| AlmaLinux:8 | nginx-mod-http-image-filter | 1:1.24.0-3.module_el8.10.0+4159+021b4a2a.alma.1 | ALSA-2026:6907 |
| AlmaLinux:9 | nginx-mod-http-image-filter | 1:1.24.0-5.module_el9.7.0+220+47ec8b91.2.alma.1 | ALSA-2026:6923 |
| AlmaLinux:9 | nginx-mod-http-image-filter | 2:1.26.3-2.module_el9.7.0+223+9cd7031b.1 | ALSA-2026:7343 |
| AlmaLinux:9 | nginx-mod-http-image-filter | 2:1.20.1-24.el9_7.2.alma.1 | ALSA-2026:7002 |
| AlmaLinux:8 | nginx-mod-http-perl | 1:1.24.0-3.module_el8.10.0+4159+021b4a2a.alma.1 | ALSA-2026:6907 |
| AlmaLinux:9 | nginx-mod-http-perl | 2:1.26.3-2.module_el9.7.0+223+9cd7031b.1 | ALSA-2026:7343 |
| AlmaLinux:9 | nginx-mod-http-perl | 1:1.24.0-5.module_el9.7.0+220+47ec8b91.2.alma.1 | ALSA-2026:6923 |
| AlmaLinux:9 | nginx-mod-http-perl | 2:1.20.1-24.el9_7.2.alma.1 | ALSA-2026:7002 |
| AlmaLinux:8 | nginx-mod-http-xslt-filter | 1:1.24.0-3.module_el8.10.0+4159+021b4a2a.alma.1 | ALSA-2026:6907 |
| AlmaLinux:9 | nginx-mod-http-xslt-filter | 2:1.26.3-2.module_el9.7.0+223+9cd7031b.1 | ALSA-2026:7343 |
| AlmaLinux:9 | nginx-mod-http-xslt-filter | 1:1.24.0-5.module_el9.7.0+220+47ec8b91.2.alma.1 | ALSA-2026:6923 |
| AlmaLinux:9 | nginx-mod-http-xslt-filter | 2:1.20.1-24.el9_7.2.alma.1 | ALSA-2026:7002 |
| AlmaLinux:8 | nginx-mod-mail | 1:1.24.0-3.module_el8.10.0+4159+021b4a2a.alma.1 | ALSA-2026:6907 |
| AlmaLinux:9 | nginx-mod-mail | 2:1.26.3-2.module_el9.7.0+223+9cd7031b.1 | ALSA-2026:7343 |
| AlmaLinux:9 | nginx-mod-mail | 2:1.20.1-24.el9_7.2.alma.1 | ALSA-2026:7002 |
| AlmaLinux:9 | nginx-mod-mail | 1:1.24.0-5.module_el9.7.0+220+47ec8b91.2.alma.1 | ALSA-2026:6923 |
| AlmaLinux:8 | nginx-mod-stream | 1:1.24.0-3.module_el8.10.0+4159+021b4a2a.alma.1 | ALSA-2026:6907 |
| AlmaLinux:9 | nginx-mod-stream | 2:1.20.1-24.el9_7.2.alma.1 | ALSA-2026:7002 |
| AlmaLinux:9 | nginx-mod-stream | 1:1.24.0-5.module_el9.7.0+220+47ec8b91.2.alma.1 | ALSA-2026:6923 |
| AlmaLinux:9 | nginx-mod-stream | 2:1.26.3-2.module_el9.7.0+223+9cd7031b.1 | ALSA-2026:7343 |
| Alpine:v3.22 | nginx | 1.28.3-r0 | ALPINE-CVE-2026-27654 |
| Alpine:v3.23 | nginx | 1.28.3-r0 | ALPINE-CVE-2026-27654 |
| Alpine:v3.24 | nginx | 1.28.3-r0 | ALPINE-CVE-2026-27654 |
| Debian:12 | nginx | 1.22.1-9+deb12u5 | DEBIAN-CVE-2026-27654 |
| Debian:13 | nginx | 1.26.3-3+deb13u3 | DEBIAN-CVE-2026-27654 |
| Debian:14 | nginx | 1.28.3-1 | DEBIAN-CVE-2026-27654 |
| Rocky Linux:10 | nginx | 2:1.26.3-2.el10_1.1 | RLSA-2026:6906 |
| Rocky Linux:8 | nginx | 1:1.24.0-3.module+el8.10.0+40144+38158758 | RLSA-2026:6907 |
| Rocky Linux:9 | nginx | 2:1.20.1-24.el9_7.2.rocky.0.1 | RLSA-2026:7002 |
| Rocky Linux:9 | nginx | 1:1.24.0-5.module+el9.7.0+40088+99dbd8cd.1.rocky.0.1 | RLSA-2026:6923 |
| Rocky Linux:9 | nginx | 2:1.26.3-2.module+el9.7.0+40103+2443f6d1 | RLSA-2026:7343 |
| Ubuntu:22.04:LTS | nginx | 1.18.0-6ubuntu14.10 | UBUNTU-CVE-2026-27654 |
| Ubuntu:24.04:LTS | nginx | 1.24.0-2ubuntu7.7 | UBUNTU-CVE-2026-27654 |
| Ubuntu:25.10 | nginx | 1.28.0-6ubuntu1.2 | UBUNTU-CVE-2026-27654 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| F5 | NGINX Open Source | 1.29.0 – before 1.29.70.5.13 – before 1.28.3 |
| F5 | NGINX Plus | R36 – before R36 P3R35 – before R35 P2R34 – before *R33 – before *R32 – before R32 P5 |
Weakness: CWE-122, CWE-120 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
References
- https://my.f5.com/manage/s/article/K000160382 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-27654 vdb-entry, x_refsource_REDHAT
- RHBZ#2450776 issue-tracking, x_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27654.json x_sadp-csaf-vex
- https://access.redhat.com/errata/RHSA-2026:13634 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:6906 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:6907 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:15942 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:14836 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:13839 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:15943 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:15945 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:13680 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:15966 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:6923 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:7002 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:7343 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:8346 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:10065 vendor-advisory, x_refsource_REDHAT