{"schemaVersion":3,"id":"CVE-2026-54592","aliases":["UBUNTU-CVE-2026-54592","DEBIAN-CVE-2026-54592","CGA-29rf-v244-hf86","CGA-2g53-8mm8-f4j2","CGA-32h6-9vcc-279f","CGA-3rwg-r4r6-jc5c","CGA-83xj-xvpm-m436","CGA-983r-gwh3-g33g","CGA-c9hr-56r4-69v4","CGA-frqq-8fqf-qh6q","CGA-hw4w-wr7h-h89f","CGA-jfq4-2c57-xjww","CGA-mq53-34j4-pgvh","CGA-qc8f-5m73-p53c","CGA-qcm3-fh6c-5f6f","CGA-qr4w-jm5r-8vpw","CGA-r8qq-mpvv-9qfc","CGA-wc5x-p7mv-c4mp","CGA-238r-6772-pjjm","CGA-2gm8-65q7-4g97","CGA-2qpx-p4gw-38m6","CGA-3wgr-7jfc-q5g5","CGA-45cw-2fwq-8q3g","CGA-46w8-ph9f-3c38","CGA-47xx-j66h-f7mc","CGA-4fmx-2xxr-5346","CGA-4fqc-m3q8-fw9v","CGA-5qvg-9c6v-h8jm","CGA-64cp-vg5v-2h24","CGA-65jh-prfp-pvqp","CGA-6gmr-4m73-r89r","CGA-6rjr-4w9q-3wwx","CGA-6wjg-962x-q5rf","CGA-72rj-c375-6wxh","CGA-864g-7gcr-5455","CGA-8c65-w2hx-xgcw","CGA-8hwx-6cjf-vw3g","CGA-9vvj-fmmc-qccw","CGA-cj89-prvx-cfmw","CGA-cjpq-p2vj-whjw","CGA-crqc-xwg3-fvwh","CGA-f2mw-g6hx-hf6f","CGA-fxw5-fcq3-2f7w","CGA-gfgq-4r57-4pc7","CGA-h6v8-4m56-9q4m","CGA-hqc4-88r7-c48v","CGA-jqhr-m9c6-grhr","CGA-jrh9-pmj8-f6mw","CGA-jwhv-93qr-5ff6","CGA-mq35-gj8v-8h5x","CGA-p4hq-qmjw-9pq3","CGA-pjr8-92jf-59rh","GHSA-3m6q-jj5j-38c9","CGA-q7f4-4qfv-6cfm","CGA-rf96-qmx7-h3w5","CGA-rwvp-rvh2-qf93","CGA-v8f2-7x3c-c3j9","CGA-vvc8-mj65-fgpg","CGA-w45c-f756-7j88","CGA-wgqr-3734-wpfj","CGA-x5h4-gxf4-92fx","CGA-xjhc-5gpv-xw5x","CGA-xmxp-7gwm-7mf7"],"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::Doc#each_child, when invoked recursively over a deeply nested JSON document, overflows a fixed-size stack buffer and aborts the process, leading to DoS.  In a two-step chain in ext/oj/fast.c, doc_each_child increments doc->where past the where_path[MAX_STACK = 100] array with no bounds check and never restores it (the doc->where-- is missing), so calling each_child recursively from inside the yield block drives doc->where beyond the array. On the next entry  the function copies the path into the 800-byte stack-local buffer save_path[MAX_STACK]  using wlen = doc->where - doc->where_path, so when the previous recursive call left doc->where past where_path[100] the wlen exceeds MAX_STACK and  the memcpy overflows save_path on the C stack; because the Oj::Doc parser imposes no JSON nesting-depth limit (relying on a C-stack pressure check), deeply nested attacker input reaches this path. 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