PT-2026-40677 · F5+2 · Nginx Open Source+2

Published 2026-05-13 · Updated 2026-06-09 · CVE-2026-42926

Positive Technologies (AI Summary)

CVSS v3.1

5.8

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

Name of the Vulnerable Software and Affected Versions NGINX Open Source versions prior to 1.30.0

Description When configured to proxy HTTP/2 traffic by setting proxy http version to 2 and utilizing proxy set body, an attacker may inject frame headers and payload bytes to the upstream peer.

Recommendations Update to a version 1.30.0 or later. As a temporary workaround, avoid using proxy set body when proxy http version is set to 2.

Fix

DoS

Weakness Enumeration

CWE-172

Related Identifiers

BDU:2026-06962

BIT-NGINX-2026-42926

BIT-NGINX-GATEWAY-2026-42926

CVE-2026-42926

ECHO-64E0-D4EC-3B8B

OPENSUSE-SU-2026:10796-1

Affected Products

Nginx Open Source

Nginx

Red Os

References · 29

• https://osv.dev/vulnerability/ALPINE-CVE-2026-42926 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-42926 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-06962 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-42926 · Vendor Advisory
• https://osv.dev/vulnerability/BIT-nginx-gateway-2026-42926 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10796-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-42926 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-42926 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-42926 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-42926 · Security Note
• https://osv.dev/vulnerability/BIT-nginx-2026-42926 · Vendor Advisory
• https://github.com/nginx/nginx/commit/ce3362cfd5c3e1434a6151cfa585b89114389da7 · Note
• https://github.com/nginx/nginx/commit/a0e742944db64d8a547cc2e7a0ba4c2e85cd4b98 · Note
• https://redos.red-soft.ru/support/secure/uyazvimosti/support/secure/uyazvimosti/uyazvimost-nginx-cve-2026-42926-7.3 · Note
• https://twitter.com/mufeedvh/status/2055670181305967047 · Twitter Post