VULNERABILITY INTELLIGENCE

CVE-2016-2338

CVSS score9.8 CRITICAL

EPSS probability4.68%

CISA KEVNot currently listed

Published2022-09-29

Last modified2026-06-17

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Description

An exploitable heap overflow vulnerability exists in the Psych::Emitter start_document function of Ruby. In Psych::Emitter start_document function heap buffer "head" allocation is made based on tags array length. Specially constructed object passed as element of tags array can increase this array size after mentioned allocation and cause heap overflow.

Weakness classification

CWE-787: Out-of-bounds Write

Primary references

cret@cert.org — Exploit, Third Party Advisory
cret@cert.org — Mailing List, Third Party Advisory
cret@cert.org — Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Exploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Third Party Advisory