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CVE-2025-59830

Rack QueryParser has an unsafe default allowing params_limit bypass via semicolon-separated parameters

Published: Sep 25, 2025Updated: Oct 10, 2025 Sources: CVE List NVD GHSA BDUCWE-400
7.5HIGH
NVD MITRE
EPSS Score
0.5%
Top 57.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

Rack is a modular Ruby web server interface. Prior to version 2.2.18, Rack::QueryParser enforces its params_limit only for parameters separated by &, while still splitting on both & and ;. As a result, attackers could use ; separators to bypass the parameter count limit and submit more parameters than intended. Applications or middleware that directly invoke Rack::QueryParser with its default configuration (no explicit delimiter) could be exposed to increased CPU and memory consumption. This can be abused as a limited denial-of-service vector. This issue has been patched in version 2.2.18.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-400CWE-770

Affected Products

ООО «РусБИТех-Астра»
commercial·RUaka rusbitech-astra
Astra Linux Special EditionOn-premOS
Operating Systems / linux-distro
ПК СВ "Брест"On-prem
Operating Systems / linux-distro
rack
oss-project
rackLibrary
OSS Libraries / web-framework
ООО «Ред Софт»
commercial·RUaka red soft
РЕД ОСOn-premOS
Operating Systems / linux-distro
АО «ИВК»
commercial·RUaka ivk
АЛЬТ СП 10On-premOS
Operating Systems / linux-distro
Leah Neukirchen
individual-dev
RackLibrary
OSS Libraries / rubygems
АО «НППКТ»
commercial·RU
ОСОН ОСнова ОnyxOn-premOS
Operating Systems / linux-distro
and 1 more affected products View all →

Exploitability

Official Patch Available
Workaround Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://github.com/rack/rack/security/advisories/GHSA-625h-95r8-8xpm
github.com
https://github.com/rack/rack/commit/54e4ffdd5affebcb0c015cc6ae74635c0831ed71
github.com
https://github.com/rack/rack/commit/54e4ffdd5affebcb0c015cc6ae74635c0831ed71
github.com
and 9 more references View all →

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