CVE-2026-9256
NGINX ngx_http_rewrite_module vulnerability
CRITICAL 9.2
En bref
- Source
- NVD
- EPSS
- EPSS 10.86 % · centile 96 ()
- État
- PUBLISHED
- Publiée
- Mise à jour
- Attribuée par
- f5
- Statut NVD
- Modified
Description
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists when a rewrite directive uses a regex pattern with distinct, overlapping Perl-Compatible Regular Expression (PCRE) captures (for example, ^/((.*))$) and a replacement string that references multiple such captures (for example, $1$2) in a redirect or arguments context. An unauthenticated attacker along with conditions beyond their control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Faiblesses (CWE)
- CWE-122 — Débordement de tampon sur le tas
Références
- https://my.f5.com/manage/s/article/K000161377
- http://www.openwall.com/lists/oss-security/2026/05/22/14
- https://lists.debian.org/debian-lts-announce/2026/06/msg00023.html
- https://access.redhat.com/security/cve/CVE-2026-9256
- https://bugzilla.redhat.com/show_bug.cgi?id=2480746
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-9256.json
- https://access.redhat.com/errata/RHSA-2026:29874
- https://access.redhat.com/errata/RHSA-2026:28921
- https://access.redhat.com/errata/RHSA-2026:28212
- https://access.redhat.com/errata/RHSA-2026:28973
- https://access.redhat.com/errata/RHSA-2026:29151
- https://access.redhat.com/errata/RHSA-2026:33313
- https://access.redhat.com/errata/RHSA-2026:20351
- https://access.redhat.com/errata/RHSA-2026:44481
- https://access.redhat.com/errata/RHSA-2026:58981
Scores
| Version | Score | Vecteur | Évalué par |
|---|---|---|---|
| CVSS 3.1 | HIGH 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H | f5 |
| CVSS 4.0 | CRITICAL 9.2 | CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | f5 |
| CVSS 3.1 | HIGH 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H | redhat-SADP |
| CVSS 4.0 | CRITICAL 9.2 | CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/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 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H | NVD · f5sirt@f5.com (Secondary) |
| CVSS 3.1 | HIGH 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H | NVD · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c (Secondary) |
Références européennes
- ENISA EUVD · EUVD-2026-31444
- GCVE · GCVE-0-2026-9256
Avis du CERT-FR
- CERTFR-2026-AVI-1056 — Multiples vulnérabilités dans les produits Splunk · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0643 — Vulnérabilité dans Nginx · cert.ssi.gouv.fr
Configurations affectées (CPE NVD)
cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:*≥ 0.1.17 ≤ 0.9.7cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:*≥ 1.0.0 < 1.30.2cpe:2.3:a:f5:nginx_open_source:1.31.0:*:*:*:*:*:*:*cpe:2.3:a:f5:nginx_plus:*:*:*:*:continuous_releases:*:*:*≥ r33 < r36cpe:2.3:a:f5:nginx_plus:37.0.0.1:*:*:*:long-term_support:*:*:*cpe:2.3:a:f5:nginx_plus:r32:-:*:*:continuous_releases:*:*:*cpe:2.3:a:f5:nginx_plus:r32:p1:*:*:continuous_releases:*:*:*cpe:2.3:a:f5:nginx_plus:r32:p2:*:*:continuous_releases:*:*:*cpe:2.3:a:f5:nginx_plus:r32:p3:*:*:continuous_releases:*:*:*cpe:2.3:a:f5:nginx_plus:r32:p4:*:*:continuous_releases:*:*:*cpe:2.3:a:f5:nginx_plus:r32:p5:*:*:continuous_releases:*:*:*cpe:2.3:a:f5:nginx_plus:r32:p6:*:*:continuous_releases:*:*:*cpe:2.3:a:f5:nginx_plus:r36:-:*:*:continuous_releases:*:*:*cpe:2.3:a:f5:nginx_plus:r36:p1:*:*:continuous_releases:*:*:*cpe:2.3:a:f5:nginx_plus:r36:p2:*:*:continuous_releases:*:*:*cpe:2.3:a:f5:nginx_plus:r36:p3:*:*:continuous_releases:*:*:*cpe:2.3:a:f5:nginx_plus:r36:p4:*:*:continuous_releases:*:*:*cpe:2.3:a:f5:dos:*:*:*:*:*:nginx:*:*≥ 4.3.0 ≤ 4.7.0cpe:2.3:a:f5:dos:4.9.0:*:*:*:*:nginx:*:*cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:*≥ 1.3.0 ≤ 1.6.2cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:*≥ 2.0.0 < 2.6.2cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:continuous_releases:*:*:*≥ 3.5.0 ≤ 3.7.2cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:continuous_releases:*:*:*≥ 4.0.0 ≤ 4.0.1cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:continuous_releases:*:*:*≥ 5.0.0 < 5.4.3cpe:2.3:a:f5:nginx_instance_manager:*:*:*:*:*:*:*:*≥ 2.17.0 < 2.22.1cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:*≥ 4.10.0 ≤ 4.16.0cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:*≥ 5.2.0 ≤ 5.8.0cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:*≥ 5.9.0 ≤ 5.13.0cpe:2.3:a:redhat:discovery:-:*:*:*:*:*:*:*cpe:2.3:a:redhat:hardened_images:-:*:*:*:*:*:*:*cpe:2.3:a:redhat:update_infrastructure:*:*:*:*:*:*:*:*≥ 5.0 < 5.2cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*
Produits affectés
| Produit | Versions |
|---|---|
| F5 · NGINX Plus | affected 37.0 < 37.0.1.1 ; affected R36 < R36 P5 ; affected R32 < R32 P7 |
| F5 · NGINX Open Source | affected 1.31.0 < 1.31.1 ; affected 1.30.0 < 1.30.2 ; affected 0.1.17 ≤ 0.9.7 |
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 |