CVE-2026-42926
NGINX ngx_http_proxy_v2_module vulnerability
5.8CVSSMEDIUM
Description
When NGINX Open Source is configured to proxy HTTP/2 traffic by setting proxy_http_version to 2, and also uses proxy_set_body, an attacker may be able to inject frame headers and payload bytes to the upstream peer. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
CVSS Vector Breakdown
Exploitability
AV:NAttack VectorNetwork
AC:LAttack ComplexityLow
PR:NPrivileges RequiredNone
UI:NUser InteractionNone
Scope
S:CScopeChanged
Impact
C:NConfidentialityNone
I:LIntegrityLow
A:NAvailabilityNone
Weaknesses
Affected Products
and 5 more affected products View all →
Exploitability
Official Patch Available
Workaround Available
References
Timeline
Published
May 13, 2026
Last Updated
Jun 18, 2026
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