Riskcovery

CVE-2026-54696

Ruby JSON: JSON generator heap buffer overflow when streaming to an IO

State
Published
Severity
3.7 Low
Published
Jun 30, 2026
Updated
Jul 1, 2026
Reserved
Jun 15, 2026

Read the record on cve.org

Description

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.

Scores

CVSSScoreVectorSource
3.13.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:LGitHub_M

Weaknesses

  • CWE-122 Heap-based Buffer Overflow
  • CWE-131 Incorrect Calculation of Buffer Size
  • CWE-787 Out-of-bounds Write

Affected Products

ProductVersions
jsonruby
  • >= 2.9.0, < 2.19.9Affected

References

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