CVE-2026-81334
Severity CVSS v4.0:
MEDIUM
Type:
CWE-125
Out-of-bounds Read
Publication date:
27/08/2026
Last modified:
27/08/2026
Description
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.
Impact
Base Score 4.0
6.90
Severity 4.0
MEDIUM
Base Score 3.x
6.10
Severity 3.x
MEDIUM
References to Advisories, Solutions, and Tools
- https://github.com/hank-ai/darknet
- https://github.com/hank-ai/darknet/blob/v6.0/src-lib/darknet_cfg.cpp
- https://github.com/hank-ai/darknet/blob/v6.0/src-lib/darknet_network.cpp
- https://www.vulncheck.com/advisories/darknet-through-6.0-out-of-bounds-read-and-write-via-unchecked-layer-index-in-cfg-parser