Medium severity4.8NVD Advisory· Published Apr 2, 2026· Updated Apr 21, 2026
CVE-2026-26962
CVE-2026-26962
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
rackRubyGems | >= 3.2.0, < 3.2.6 | 3.2.6 |
Affected products
18- osv-coords17 versionspkg:apk/chainguard/pact-broker-dockerpkg:apk/chainguard/pact-broker-docker-fipspkg:apk/chainguard/ruby3.2-rails-7.2pkg:apk/chainguard/ruby3.2-rails-8.0pkg:apk/chainguard/ruby3.4-rails-7.2pkg:apk/chainguard/ruby3.4-rails-8.0pkg:apk/wolfi/ruby3.2-rails-8.0pkg:apk/wolfi/ruby3.4-rails-8.0pkg:gem/rackpkg:rpm/suse/rmt-server&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-ESPOSpkg:rpm/suse/rmt-server&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-LTSSpkg:rpm/suse/rmt-server&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP5pkg:rpm/suse/rmt-server&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP6pkg:rpm/suse/rmt-server&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP5-LTSSpkg:rpm/suse/rmt-server&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP6-LTSSpkg:rpm/suse/rmt-server&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP5pkg:rpm/suse/rmt-server&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP6
< 2.137.0.2.118.0-r4+ 16 more
- (no CPE)range: < 2.137.0.2.118.0-r4
- (no CPE)range: < 2.137.0.2.118.0-r2
- (no CPE)range: < 7.2.3.1-r2
- (no CPE)range: < 8.0.5-r0
- (no CPE)range: < 7.2.3.1-r1
- (no CPE)range: < 8.0.5-r2
- (no CPE)range: < 8.0.5-r0
- (no CPE)range: < 8.0.5-r2
- (no CPE)range: >= 3.2.0, < 3.2.6
- (no CPE)range: < 2.27-150500.3.47.1
- (no CPE)range: < 2.27-150500.3.47.1
- (no CPE)range: < 2.27-150500.3.47.1
- (no CPE)range: < 2.27-150500.3.47.1
- (no CPE)range: < 2.27-150500.3.47.1
- (no CPE)range: < 2.27-150500.3.47.1
- (no CPE)range: < 2.27-150500.3.47.1
- (no CPE)range: < 2.27-150500.3.47.1
Patches
Vulnerability mechanics
References
4- github.com/advisories/GHSA-rx22-g9mx-qrhvghsaADVISORY
- github.com/rack/rack/security/advisories/GHSA-rx22-g9mx-qrhvnvdVendor AdvisoryMitigationWEB
- nvd.nist.gov/vuln/detail/CVE-2026-26962ghsaADVISORY
- github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2026-26962.ymlghsaWEB
News mentions
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