{"schemaVersion":3,"id":"CVE-2026-54500","aliases":["UBUNTU-CVE-2026-54500","DEBIAN-CVE-2026-54500","CGA-2qhv-6577-fvf8","CGA-45mh-5cwc-j6m2","CGA-5mpm-5gg2-q45j","CGA-6h64-55gr-6cqg","CGA-9773-xhrr-r6pc","CGA-9vhv-2wrf-w7p8","CGA-cqch-4988-v75x","CGA-f7c6-vrfr-qhwp","CGA-jh8p-xm9c-mjfr","CGA-m68x-qr62-7xwm","CGA-m8r4-2fjw-w4q4","CGA-pchg-2375-f6fp","CGA-q67v-cmm5-v9qh","CGA-qwgv-p7hr-92q7","CGA-rj38-23w6-3fmh","CGA-v8vc-w77h-r9v7","CGA-22q8-r7rf-gf2c","CGA-2mrh-2c67-pqwr","CGA-2mrp-3ccj-gw4r","CGA-35vj-jmgr-jv2w","CGA-3xhx-h4p5-8pj8","CGA-4q27-pvr4-65hq","CGA-5jfg-r45x-249g","CGA-5vh5-5jv8-c4xr","CGA-642j-m6wf-f8mg","CGA-6rg3-m3j5-gvmj","CGA-7586-3w86-qpcq","CGA-79p9-jqhg-4mmx","CGA-7hvv-p7xv-hcxj","CGA-7wv3-rcgj-4rwh","CGA-9hj7-hq8x-x4vc","CGA-cjx8-xp4m-fhh9","CGA-cm4g-pg4h-xjr6","CGA-cmqc-x85m-x74g","CGA-cp9c-6xcx-g586","CGA-fx4q-cq29-f2cg","CGA-g2g4-w5c4-q9cm","CGA-g586-rxf9-2wh2","CGA-hhww-6p7g-32fw","CGA-hpwf-x872-j73j","CGA-j4rx-q2g8-wggv","CGA-p548-4v3x-xrxx","CGA-p5gm-ch9w-c37v","CGA-p62p-8fr4-8v68","GHSA-fm7p-mprw-wjm9","CGA-qh3v-jhw2-j8h7","CGA-qmr2-fqq6-vqc5","CGA-qph6-gqwc-pqhw","CGA-qrc5-x86v-3x2f","CGA-qw9x-ffvh-gjh4","CGA-r59m-rrfq-x593","CGA-rg8m-3gvq-5mh6","CGA-rr4v-3vg8-943q","CGA-rvmm-hcp3-5pf4","CGA-v2c3-2vp2-mhhq","CGA-wwj5-mqqf-9ff5","CGA-wxq7-8cpc-v3rg","CGA-x9jg-phx4-qf53","CGA-xfwh-c4qh-28qj","CGA-xq7w-7w46-2f77","CGA-xv5h-3246-3fh4"],"status":"published","duplicateOf":null,"title":null,"description":"Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.3, Oj.load in :object mode reads uninitialized stack memory (and, for long keys, reads out of bounds) when parsing a JSON object whose key is 254 bytes or longer. The interned bytes can surface to the caller, disclosing process stack memory. In ext/oj/intern.c, form_attr() handles the long-key path by allocating a heap buffer, `b`, populating it with the attribute name, and then freeing it — but it passed the uninitialized stack buffer buf (not b) to rb_intern3(). rb_intern3 therefore reads len + 1 bytes of uninitialized stack memory. When the key length is >= 256, it also reads out of bounds past the 256-byte buf. The resulting bytes are interned and can reach the caller via the produced Symbol or via the EncodingError message raised on invalid UTF-8, leaking process stack contents. 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