CVE-2026-125108: rack · Interpretation Conflict
Affects rackSource CVE Database V5
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
Thin evidence
One scorer or none| CNA (GitHub_M) | CVSS 3.1 | 3.7 |
|---|
- 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:NExploitation evidence
Disclosed: evidence found.
CVE published 9 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| rackrack | Affected
| Fixed in
|
| rackrack | Affected
| Fixed in
|
| rackrack | Affected
| Fixed in
|
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
- github.com/rack/rack/security/advisories/GHSA-p8x9-v4hv-2w4g (opens in a new tab)
- github.com/rack/rack/commit/19a1a19cb4da97d61c8d5effeb2e927c44370ae9 (opens in a new tab)
- github.com/rack/rack/commit/a29512324265790a5536b830490075d0d79323be (opens in a new tab)
- github.com/rack/rack/commit/d5e928b803da30b8e40171dbd4be39bed7daa6fa (opens in a new tab)
- github.com/rack/rack/releases/tag/v2.2.25 (opens in a new tab)
- github.com/rack/rack/releases/tag/v3.1.23 (opens in a new tab)
- github.com/rack/rack/releases/tag/v3.2.8 (opens in a new tab)