Is CVE-2026-26962 actively exploited?

No active exploitation of CVE-2026-26962 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-26962 be exploited remotely?

Yes. CVE-2026-26962 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-26962?

CVE-2026-26962 has a CVSS score of 4.8 (MEDIUM).

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MEDIUM

CVE-2026-26962

CWE-93Published: April 2, 2026· Updated: Apr 3, 2026

4.8

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:11.8th

Official Description

Rack is a modular Ruby web server interface. From version 3.2.0 to before version 3.2.6, Rack::Multipart::Parser unfolds folded multipart part headers incorrectly. When a multipart header contains an obs-fold sequence, Rack preserves the embedded CRLF in parsed parameter values such as filename or name instead of removing the folded line break during unfolding. As a result, applications that later reuse those parsed values in HTTP response headers may be vulnerable to downstream header injection or response splitting. This issue has been patched in version 3.2.6.

NVD Source

Technical Analysis

CVE-2026-26962 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.