CVE-2026-27654
NGINX ngx_http_dav_module vulnerability
HIGH 8.8
At a glance
- Source
- NVD
- EPSS
- EPSS 25.94 % · percentile 98 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- f5
- NVD status
- Modified
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.
Weaknesses (CWE)
References
- https://my.f5.com/manage/s/article/K000160382
- https://access.redhat.com/security/cve/CVE-2026-27654
- https://bugzilla.redhat.com/show_bug.cgi?id=2450776
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27654.json
- https://access.redhat.com/errata/RHSA-2026:13634
- https://access.redhat.com/errata/RHSA-2026:6906
- https://access.redhat.com/errata/RHSA-2026:6907
- https://access.redhat.com/errata/RHSA-2026:15942
- https://access.redhat.com/errata/RHSA-2026:14836
- https://access.redhat.com/errata/RHSA-2026:13839
- https://access.redhat.com/errata/RHSA-2026:15943
- https://access.redhat.com/errata/RHSA-2026:15945
- https://access.redhat.com/errata/RHSA-2026:13680
- https://access.redhat.com/errata/RHSA-2026:15966
- 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/errata/RHSA-2026:10065
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 8.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H | f5 |
| CVSS 4.0 | HIGH 8.8 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N | f5 |
| CVSS 3.1 | HIGH 8.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H | redhat-SADP |
| CVSS 4.0 | HIGH 8.8 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X | NVD · f5sirt@f5.com (Secondary) |
| CVSS 3.1 | HIGH 8.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H | NVD · f5sirt@f5.com (Secondary) |
| CVSS 3.1 | HIGH 8.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H | NVD · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c (Secondary) |
European references
- ENISA EUVD · EUVD-2026-14881
- GCVE · GCVE-0-2026-27654
CERT-FR advisories
- CERTFR-2026-AVI-1056 — Multiples vulnérabilités dans les produits Splunk · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0376 — Multiples vulnérabilités dans les produits Microsoft · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0352 — Multiples vulnérabilités dans les produits F5 · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:a:f5:nginx_plus:r32:p1:*:*:*:*:*:*cpe:2.3:a:f5:nginx_plus:r32:p2:*:*:*:*:*:*cpe:2.3:a:f5:nginx_plus:r32:p3:*:*:*:*:*:*cpe:2.3:a:f5:nginx_plus:r32:p4:*:*:*:*:*:*cpe:2.3:a:f5:nginx_plus:r33:*:*:*:*:*:*:*cpe:2.3:a:f5:nginx_plus:r33:p1:*:*:*:*:*:*cpe:2.3:a:f5:nginx_plus:r33:p2:*:*:*:*:*:*cpe:2.3:a:f5:nginx_plus:r33:p3:*:*:*:*:*:*cpe:2.3:a:f5:nginx_plus:r34:*:*:*:*:*:*:*cpe:2.3:a:f5:nginx_plus:r34:p1:*:*:*:*:*:*cpe:2.3:a:f5:nginx_plus:r34:p2:*:*:*:*:*:*cpe:2.3:a:f5:nginx_plus:r35:*:*:*:*:*:*:*cpe:2.3:a:f5:nginx_plus:r35:p1:*:*:*:*:*:*cpe:2.3:a:f5:nginx_plus:r36:*:*:*:*:*:*:*cpe:2.3:a:f5:nginx_plus:r36:p1:*:*:*:*:*:*cpe:2.3:a:f5:nginx_plus:r36:p2:*:*:*:*:*:*cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:*≥ 0.5.13 ≤ 0.9.7cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:*≥ 1.0.0 < 1.28.3cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:*≥ 1.29.0 < 1.29.7
Affected products
| Product | Versions |
|---|---|
| F5 · NGINX Open Source | affected 1.29.0 < 1.29.7 ; affected 0.5.13 < 1.28.3 |
| F5 · NGINX Plus | affected R36 < R36 P3 ; affected R35 < R35 P2 ; affected R34 < * ; affected R33 < * ; affected R32 < R32 P5 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |