---
schema_version: '1.0'
id: security-20260705-865914
url: https://osv.dev/vulnerability/DEBIAN-CVE-2026-9256
url_hash: 865914af8902372626af97da589ba98caf2d0a7af2225c876a4ce1c34c722e8c
canonical_url: https://osv.dev/vulnerability/DEBIAN-CVE-2026-9256
source: osv:debian
category: security/os
category_raw: cve/os
region: null
tags:
- cve
- DEBIAN-CVE-2026-9256
- severity: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
- nginx
- Debian
lang: en
published_at: '2026-05-22T15:16:27Z'
fetched_at: '2026-07-05T15:34:33Z'
updated_at: '2026-07-05T15:35:24Z'
status: published
content_hash: d674da0237328e5c405953b25aa1964b46eb2bd3b4442b5122f67c6f30a8395f
license_note: full
summary: 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, ^/((.*))$) and a replac
summary_source: rss
summary_en: NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module
  module. This vulnerability exists when a rewrite directive uses a regex pattern
  with distinct, overlapping Perl-Compatible Regular Expression (PCRE) captures (for
  example, ^/((.*))$) and a replac
entities: []
key_facts: []
related: []
related_auto: []
title: DEBIAN-CVE-2026-9256 — nginx
---

# DEBIAN-CVE-2026-9256 — nginx

## TL;DR
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 replac

## Key Points
- cve / DEBIAN-CVE-2026-9256 / severity: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 / nginx / Debian

## Details
**Severity:** 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
**Advisory:** DEBIAN-CVE-2026-9256

**Affected (your watchlist):**
- `Debian:nginx` 1.22.1-9+deb12u1 → no fixed version listed [proxmox]

**Details:**
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.

**References:**
- https://security-tracker.debian.org/tracker/CVE-2026-9256

_Data: OSV.dev (upstream: debian) — https://osv.dev/vulnerability/DEBIAN-CVE-2026-9256_

## Source
元記事: [DEBIAN-CVE-2026-9256 — nginx](https://osv.dev/vulnerability/DEBIAN-CVE-2026-9256) — published 2026-05-22T15:16:27Z