CVE-2026-54900 (GCVE-0-2026-54900)

Vulnerability from cvelistv5 – Published: 2026-06-30 23:34 – Updated: 2026-07-01 15:48
VLAI
Title
Oj: Negative-Size memcpy in Oj::Parser create_id Attribute Handling
Summary
Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.2, when in usual mode with create_id enabled, Oj::Parser#parse is vulnerable to heap corruption via a negative-size memcpy. When a JSON object key is exactly 65,535 bytes long, an integer truncation in form_attr (usual.c:63) converts the length to -1 before passing it to memcpy. This causes memcpy to copy SIZE_MAX bytes (interpreted as a huge size_t), corrupting heap memory and crashing the process. The issue has been fixed in version 3.17.2.
Severity
6.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
SSVC
Exploitation: poc Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-01 15:47 UTC
CWE
  • CWE-190 - Integer Overflow or Wraparound
  • CWE-787 - Out-of-bounds Write
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 8078 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
ohler55 oj Affected: < 3.17.2
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

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