CVE Explorer
CVE-2026-26962
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
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"rack","vendor":"rack","versions":[{"status":"affected","version":">= 3.2.0, < 3.2.6"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:2bddd92ff305981c1d5e209cb342445734be0f4003e8f39c5daa00c272aa5913 · sha256:c3081fd3ac9f0668… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.8,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:2bddd92ff305981c1d5e209cb342445734be0f4003e8f39c5daa00c272aa5913 · sha256:c3081fd3ac9f0668… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-93","description":"CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:2bddd92ff305981c1d5e209cb342445734be0f4003e8f39c5daa00c272aa5913 · sha256:c3081fd3ac9f0668… · /containers/cna/problemTypes/0/descriptions/0
Source references
1 source assertion{"name":"https://github.com/rack/rack/security/advisories/GHSA-rx22-g9mx-qrhv","tags":["x_refsource_CONFIRM"],"url":"https://github.com/rack/rack/security/advisories/GHSA-rx22-g9mx-qrhv"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:2bddd92ff305981c1d5e209cb342445734be0f4003e8f39c5daa00c272aa5913 · sha256:c3081fd3ac9f0668… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.