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Servers and applications

CVE-2011-4815

Ruby (aka CRuby) before 1.8.7-p357 computes hash values without restricting the ability to trigger hash collisions predictably, which allows context-dependent attackers to cause a denial of service (CPU consumption) via crafted input to an application that maintains a hash table.

Severity
High 7.8
Published
30 Dec 2011
Last changed
16 Jun 2026
Added to UpHeron
21 Oct 2026
Exploit chance
4.1% in the next 30 daysHigher than 90% of CVEs. EPSS by FIRST, 12 Nov 2026
Weakness
Improper input validation (CWE-20)
Attack
Over the network · No login needed
Attacker can
Take it down
CVSS vector
AV:N/AC:L/Au:N/C:N/I:N/A:C
Sources
NVD

Affected software

SoftwareAffected versions
RubyServers and applications · cpe:a:ruby-lang:ruby
  • Every version up to 1.8.7-p352
  • Version 1.8.7-p299
  • Version 1.8.7-p302
  • Version 1.8.7-p330
  • Version 1.8.7-p334

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2011-4815
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2011-4815