Is CVE-2026-34826 actively exploited?

No active exploitation of CVE-2026-34826 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-34826 be exploited remotely?

Yes. CVE-2026-34826 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-34826?

CVE-2026-34826 has a CVSS score of 5.3 (MEDIUM).

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MEDIUM

CVE-2026-34826

CWE-400Published: April 2, 2026· Updated: Apr 3, 2026

5.3

CVSS v3.1

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

Official Description

Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Utils.get_byte_ranges parses the HTTP Range header without limiting the number of individual byte ranges. Although the existing fix for CVE-2024-26141 rejects ranges whose total byte coverage exceeds the file size, it does not restrict the count of ranges. An attacker can supply many small overlapping ranges such as 0-0,0-0,0-0,... to trigger disproportionate CPU, memory, I/O, and bandwidth consumption per request. This results in a denial of service condition in Rack file-serving paths that process multipart byte range responses. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.

NVD Source

Technical Analysis

CVE-2026-34826 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.