{"id":"DEBIAN-CVE-2026-54900","details":"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.","modified":"2026-09-27T19:00:07.551207705Z","published":"2026-07-01T00:16:33.340Z","upstream":["CVE-2026-54900"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-54900"}],"affected":[{"package":{"name":"ruby-oj","ecosystem":"Debian:12","purl":"pkg:deb/debian/ruby-oj?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.14.2-1","3.15.0-1","3.16.0-1","3.16.1-1","3.16.12-1","3.16.15-1","3.16.16-1","3.16.3-1","3.17.0-1","3.17.1-1","3.17.3-1","3.17.4-1","3.17.6-1","3.17.6-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54900.json"}},{"package":{"name":"ruby-oj","ecosystem":"Debian:13","purl":"pkg:deb/debian/ruby-oj?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.16.3-1+deb13u1"}]}],"versions":["3.16.3-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54900.json"}},{"package":{"name":"ruby-oj","ecosystem":"Debian:14","purl":"pkg:deb/debian/ruby-oj?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.17.3-1"}]}],"versions":["3.16.12-1","3.16.15-1","3.16.16-1","3.16.3-1","3.17.0-1","3.17.1-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54900.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"}]}