CVE-2011-5036

Severity: medium (CVSS 5.0 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.9% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2011-12-30 · updated 2026-06-16
Weakness: CWE-310

Description

Rack before 1.1.3, 1.2.x before 1.2.5, and 1.3.x before 1.3.6 computes hash values for form parameters without restricting the ability to trigger hash collisions predictably, which allows remote attackers to cause a denial of service (CPU consumption) by sending many crafted parameters.

Affected products

Rack Project Rack: through 1.1.0; 1.2.0, 1.2.1, 1.2.2, 1.2.3, 1.2.4, 1.3.0 (+5)

References

http://archives.neohapsis.com/archives/bugtraq/2011-12/0181.html
http://www.debian.org/security/2013/dsa-2783
http://www.kb.cert.org/vuls/id/903934
http://www.nruns.com/_downloads/advisory28122011.pdf
http://www.ocert.org/advisories/ocert-2011-003.html
https://gist.github.com/52bbc6b9cc19ce330829
http://archives.neohapsis.com/archives/bugtraq/2011-12/0181.html
http://www.debian.org/security/2013/dsa-2783
http://www.kb.cert.org/vuls/id/903934
http://www.nruns.com/_downloads/advisory28122011.pdf
http://www.ocert.org/advisories/ocert-2011-003.html
https://gist.github.com/52bbc6b9cc19ce330829

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