---
schema_version: '1.0'
id: security-20260705-fbcaf3
url: https://osv.dev/vulnerability/DEBIAN-CVE-2026-42055
url_hash: fbcaf31fbac13d517d0220f0e305871cae4d1a682f4d694818a6b0f9d2ba3e51
canonical_url: https://osv.dev/vulnerability/DEBIAN-CVE-2026-42055
source: osv:debian
category: security/os
category_raw: cve/os
region: null
tags:
- cve
- DEBIAN-CVE-2026-42055
- 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: '2026-06-17T15:16:50Z'
fetched_at: '2026-07-05T15:34:33Z'
updated_at: '2026-07-05T15:35:24Z'
status: published
content_hash: 65396a1bbabbbe7ca787ce4a777d7180d46872fe68e71991cf2b416a916d1e03
license_note: full
summary: NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_proxy_v2_module and
  ngx_http_grpc_module modules. This vulnerability exists when the proxy_http_version
  to 2 or grpc_pass directives are used to proxy HTTP/2 traffic, the ignore_invalid_headers directive
  is set
summary_source: rss
summary_en: NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_proxy_v2_module and
  ngx_http_grpc_module modules. This vulnerability exists when the proxy_http_version
  to 2 or grpc_pass directives are used to proxy HTTP/2 traffic, the ignore_invalid_headers directive
  is set
entities: []
key_facts: []
related: []
related_auto: []
title: DEBIAN-CVE-2026-42055 — nginx
---

# DEBIAN-CVE-2026-42055 — nginx

## TL;DR
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_proxy_v2_module and ngx_http_grpc_module modules. This vulnerability exists when the proxy_http_version to 2 or grpc_pass directives are used to proxy HTTP/2 traffic, the ignore_invalid_headers directive is set

## Key Points
- cve / DEBIAN-CVE-2026-42055 / 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-2026-42055

**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_proxy_v2_module and ngx_http_grpc_module modules. This vulnerability exists when the proxy_http_version to 2 or grpc_pass directives are used to proxy HTTP/2 traffic, the ignore_invalid_headers directive is set to off, and the large_client_header_buffers directive size is larger than 2 megabytes. A remote, unauthenticated attacker, along with conditions beyond their control, could send large headers while creating an upstream request. This may cause a heap-based 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-2026-42055

_Data: OSV.dev (upstream: debian) — https://osv.dev/vulnerability/DEBIAN-CVE-2026-42055_

## Source
元記事: [DEBIAN-CVE-2026-42055 — nginx](https://osv.dev/vulnerability/DEBIAN-CVE-2026-42055) — published 2026-06-17T15:16:50Z