CVE-2025-61780 — Sensitive Information Exposure in Rack

CWE-200 — Sensitive Information ExposureCWE-441 — Confused DeputyCWE-913 — Improper Control of Dynamically-Managed Code ResourcesCWE-444 — HTTP Request Smuggling9 documents7 sources
Severity
5.3MEDIUMNVD
CNA5.8OSV7.5
EPSS
0.0%
top 89.73%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
1
Rack
Timeline
PublishedOct 10
Latest updateJan 14

Description

Rack is a modular Ruby web server interface. Prior to versions 2.2.20, 3.1.18, and 3.2.3, a possible information disclosure vulnerability existed in `Rack::Sendfile` when running behind a proxy that supports `x-sendfile` headers (such as Nginx). Specially crafted headers could cause `Rack::Sendfile` to miscommunicate with the proxy and trigger unintended internal requests, potentially bypassing proxy-level access restrictions. When `Rack::Sendfile` received untrusted `x-sendfile-type` or `x-acce…

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:NExploitability: 3.9 | Impact: 1.4

Affected Packages3 packages

▶CVEListV5rack/rack< 2.2.20+2
▶NVDrack/rack3.0.0 — 3.1.18+2
▶RubyGemsrack/rack3.0 — 3.1.18+2

Patches

Patch: github.com ↗Patch: github.com ↗Patch: github.com ↗

🔴Vulnerability Details

5
OSV
ruby-rack vulnerabilities↗2026-01-14
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CVEList
Rack has Possible Information Disclosure Vulnerability↗2025-10-10
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GHSA
Rack has a Possible Information Disclosure Vulnerability↗2025-10-10
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OSV
Rack has a Possible Information Disclosure Vulnerability↗2025-10-10
▶
OSV
CVE-2025-61780: Rack is a modular Ruby web server interface↗2025-10-10
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📋Vendor Advisories

3
Ubuntu
Rack vulnerabilities↗2026-01-14
▶
Red Hat
rubygem-rack: Improper handling of headers in `Rack::Sendfile` may allow proxy bypass↗2025-10-10
▶
Debian
CVE-2025-61780: ruby-rack - Rack is a modular Ruby web server interface. Prior to versions 2.2.20, 3.1.18, a...↗2025
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CVE-2025-61780 — Sensitive Information Exposure in Rack | cvebase