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CVE-2026-54903

MEDIUM
6.3
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.load is vulnerable to heap corruption when parsing a JSON string longer than 2 GB. An integer overflow in buf_append_string (buf.h:61) converts the string length to a large negative size_t, causing memcpy to copy an astronomically large amount of data out of bounds. This crashes the process and can corrupt adjacent heap memory. The issue has been fixed in version 3.17.2.

Metadata

CVE ID
CVE-2026-54903
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-06-16 13:49 UTC
Published
2026-06-30 23:42 UTC
Last updated
2026-06-30 23:42 UTC
Primary CWE
CWE-190
CWE-190: Integer Overflow or Wraparound
Vendor / Product
ohler55 / oj
Sources
cve.org  ·  NVD

Severity & Metrics

6.3 MEDIUM CVSS 4.0
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
Affected products (1)
VendorProductPlatformVersions
ohler55 oj — < 3.17.2
Weakness (CWE)
CWESourceDescription
CWE-190 cna CWE-190: Integer Overflow or Wraparound
CVSS scores (1)
ScoreSeverityVersionSourceVector
6.3 MEDIUM 4.0 cna 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
References (1)
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