CVE-2026-42926
NGINX ngx_http_proxy_v2_module vulnerability
5.8
MEDIUM
CVSS 3.1
EPSS 0.02%
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.
How to fix CVE-2026-42926
To remediate CVE-2026-42926, upgrade the affected package to a fixed version below.
- —upgrade to 0 or later
- —upgrade to 1.30.1 or later
- —upgrade to 1.30.1 or later
- —upgrade to 1.30.0-4 or later
Is CVE-2026-42926 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (4)
- from 0, < 0
- >= 1.29.4, < 1.30.1
- >= 1.29.4, < 1.30.1
- from 0, < 1.30.0-4
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/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 |
| osv | CVSS 3.1 | MEDIUM5.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N |