{"id":"CVE-2026-81334","summary":"darknet through 6.0 Out-of-Bounds Read and Write via Unchecked Layer Index in .cfg Parser","details":"darknet subscripts its layer array with an index taken from a configuration file without checking it against the array's length. The array is allocated in src-lib/darknet_network.cpp as xcalloc(net.n, sizeof(Darknet::Layer)), sized to exactly the number of layer sections the file declares. The shortcut, scale_channels and sam sections supply that index through their from field and the route section through its layers field, and parse_shortcut_section in src-lib/darknet_cfg.cpp reads net.layers[index].outputs with no bounds check, which reads past the allocation. The dispatch loop in create_network then reuses the same index to assign net.layers[l.index].use_bin_output and net.layers[l.index].keep_delta_gpu, writing past the allocation at an offset the file controls, with a fixed one-byte value. Parsing a crafted configuration file is sufficient: the parse runs before any weights file is opened and needs no non-default option, so the result is a reliable crash and a write whose location, though not its value, is chosen by whoever supplied the file.","modified":"2026-08-29T03:30:39.639544321Z","published":"2026-08-27T14:50:41.973Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-125","CWE-787"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81334.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81334.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-81334"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/darknet-through-6.0-out-of-bounds-read-and-write-via-unchecked-layer-index-in-cfg-parser"},{"type":"PACKAGE","url":"https://github.com/hank-ai/darknet"},{"type":"ARTICLE","url":"https://github.com/hank-ai/darknet/blob/v6.0/src-lib/darknet_cfg.cpp"},{"type":"ARTICLE","url":"https://github.com/hank-ai/darknet/blob/v6.0/src-lib/darknet_network.cpp"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/hank-ai/darknet","events":[{"introduced":"0"},{"last_affected":"f64b531e394daefd3cb8c41e760ffe598b2d6141"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"0"},{"last_affected":"6.0"}]}}],"versions":["v6.0","v5.0","v3.1","v4.0","v2.0","v1.99"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-81334.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N"}]}