PT-2026-54020 · Ruby · Json

Published 2026-06-30 · Updated 2026-06-30 · CVE-2026-54696

NVD

CVSS v3.1

3.7

Low

Base vector

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

Ruby JSON is a JSON implementation for Ruby. Versions 2.9.0 through 2.19.8 are vulnerable to heap buffer overflow when the JSON generator is provided with an oversized streamed object. When streaming to an IO JSON.dump(obj, io) and JSON::State#generate(obj, io) can write past the internal JSON generator buffer when a streamed object contains an attacker-controlled string near 16 KB. Exploitation would result in a reliable process crash/denial of service. This issue has been fixed in version 2.19.9.

Fix

Memory Corruption

Heap Based Buffer Overflow

Weakness Enumeration

CWE-131

CWE-787

CWE-122

Related Identifiers

CVE-2026-54696

Affected Products

Json

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-54696 · Security Note
• https://github.com/ruby/json/releases/tag/v2.19.9 · Note
• https://github.com/ruby/json/security/advisories/GHSA-x2f5-4prf-w687 · Note