CVE-2026-54696

Summary

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.

Affected Software

VendorProductVersion RangeStatus
rubyjson>= 2.9.0, < 2.19.9affected

Weaknesses

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

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: poc
    • Automatable: no
    • Technical Impact: partial

Additional References

References