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CVE-2026-34763

Rack: Rack::Directory info disclosure and DoS via unescaped regex interpolation

Published: Apr 2, 2026Updated: Apr 16, 2026 Sources: CVE List NVD BDUCWE-625
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.2%
Top 85.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Directory interpolates the configured root path directly into a regular expression when deriving the displayed directory path. If root contains regex metacharacters such as +, *, or ., the prefix stripping can fail and the generated directory listing may expose the full filesystem path in the HTML output. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-625

Affected Products

UbuntuCanonical Ltd.
On-premOS
Operating Systems / linux-distro
Red Hat Enterprise LinuxRed Hat Inc.
On-premOS
Operating Systems / linux-distro
Red Hat 3scale API Management PlatformRed Hat Inc.
SaaSSaaS Service
Cloud & SaaS / api-gateway
РЕД ОСООО «Ред Софт»
On-premOS
Operating Systems / linux-distro
Logging subsystem for Red Hat OpenShiftRed Hat Inc.
On-premDev Tool
Cloud & SaaS
canonical ltd.commercialGBOperating Systemsaka canonical
red hat inc.commercialUSOperating Systemsaka red hat
ооо «ред софт»commercialRUOperating Systemsaka red soft
and 2 more affected products View all →

Exploitability

Official Patch Available

References

https://github.com/rack/rack
github.com
https://github.com/rack/rack/security/advisories/GHSA-7mqq-6cf9-v2qp
github.com
https://redos.red-soft.ru/search/?iblock_id=&q=CVE-2026-34763
redos.red-soft.ru
and 3 more references View all →

Timeline

Published
Apr 2, 2026
Last Updated
Apr 16, 2026

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