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CVE-2026-54898

LOW
2.1
CVSS 4.0
Description
Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.2,Oj::Parser#parse is vulnerable to a heap use-after-free when a SAJ/SAJ2 callback mutates the input JSON string during parsing. The C engine holds a raw const byte * pointer into the Ruby string's internal buffer. If a callback (e.g. hash_start) resizes the string — for example by calling String#replace with a longer value — Ruby reallocates the string buffer and frees the old one. The C parser's pointer is left dangling; the next character read at parser.c:607 is a use-after-free. This issue has been fixed in version 3.17.2.

Metadata

CVE ID
CVE-2026-54898
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-06-16 13:49 UTC
Published
2026-06-30 23:24 UTC
Last updated
2026-06-30 23:24 UTC
Primary CWE
CWE-416
CWE-416: Use After Free
Vendor / Product
ohler55 / oj
Sources
cve.org  ·  NVD

Severity & Metrics

2.1 LOW CVSS 4.0
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Affected products (1)
VendorProductPlatformVersions
ohler55 oj — < 3.17.2
Weakness (CWE)
CWESourceDescription
CWE-416 cna CWE-416: Use After Free
CVSS scores (1)
ScoreSeverityVersionSourceVector
2.1 LOW 4.0 cna CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
References (1)
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