Is CVE-2026-42926 actively exploited?

No active exploitation of CVE-2026-42926 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-42926 be exploited remotely?

Yes. CVE-2026-42926 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-42926?

CVE-2026-42926 has a CVSS score of 5.8 (MEDIUM).

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MEDIUM

CVE-2026-42926

CWE-172Published: May 13, 2026· Updated: May 13, 2026

5.8

CVSS v3.1

EPSS:0.02%probability of exploitation in 30 daysPercentile:4.1th

Official 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.

NVD Source

Technical Analysis

CVE-2026-42926 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.