CVE catalog

CVE-2011-4838

jruby: CVE-2011-4838

Severity: Medium
Published: Dec 30, 2011, 1:55:01 AM UTC
Source: [NVD] · [CVE record]
EPSS: 4.20% · Oct 25, 2026

JRuby before 1.6.5.1 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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	jruby	sid	`10.1.2.0+ds-1`	fixed
Debian	jruby	forky	`10.1.2.0+ds-1`	fixed
Debian	jruby	trixie	`9.4.8.0+ds-3`	fixed
Debian	jruby	bookworm	`9.3.9.0+ds-8`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	jruby	source	sid	`1.5.6-4`	low	Not reported	[686867]
Debian	jruby	source	forky	`1.5.6-4`	low	Not reported	[686867]
Debian	jruby	source	trixie	`1.5.6-4`	low	Not reported	[686867]
Debian	jruby	source	bookworm	`1.5.6-4`	low	Not reported	[686867]

[Debian bug #686867]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[jruby]Fixed
Details (2)
- 9.3.9.0+ds-8 · all · bookworm
  Fixed · Fixed: 1.5.6-4
  dsa · jruby · debian · bookworm; dsa · jruby · debian · 12
- 9.3.9.0+ds-8 · all · bookworm
  Fixed · Fixed: 1.5.6-4
  dsa · jruby · debian · bookworm; dsa · jruby · debian · 12

[Debian 13 (Trixie)]

[jruby]Fixed
Details (2)
- 9.4.8.0+ds-3 · all · trixie
  Fixed · Fixed: 1.5.6-4
  dsa · jruby · debian · 13
- 9.4.8.0+ds-3 · all · trixie
  Fixed · Fixed: 1.5.6-4
  dsa · jruby · debian · 13

Observed: Oct 23, 2026, 5:05:43 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]