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VulnerabilityPublished

CVE-2026-125108: rack · Interpretation Conflict

Affects rackSource CVE Database V5

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Not known to be exploited · CVSS 3.7 Low · fixed in 3.2.8 : update rack when convenient.

Data as of 9 Nov 2026, 22:04 UTC

CVSS 3.1 base score
3.7Low
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (GitHub_M)CVSS 3.13.7
Patch
Available – fixed in 3.2.8, 3.1.23, 2.2.25
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 9 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 9 Nov 2026.

What to do

Upgrade rack to 3.2.8, 3.1.23 or 2.2.25.

Affected software

ProductAffectedFixed in
rackrackAffected
  • >=3.2 <3.2.8
Fixed in
  • 3.2.8
rackrackAffected
  • >=3.0 <3.1.23
Fixed in
  • 3.1.23
rackrackAffected
  • <2.2.25
Fixed in
  • 2.2.25

AI-suggested

Upgrade Rack to version 2.2.25, 3.1.23, or 3.2.8 or later where this issue is fixed. No other mitigation is specified or required.

Description

CVE-2026-125108 is a vulnerability in the Rack Ruby web server interface where the multipart parser can skip a leading empty or quoted boundary parameter in a multipart Content-Type header. This allows Rack to parse request bodies with boundaries that intermediaries would not recognize, potentially bypassing proxy or web application firewall inspections. The issue is fixed in Rack versions 2.2.25, 3.1.23, and 3.2.8.

References

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