{"id":"GHSA-w239-58x2-q8p5","revision":"14770e0a287b4cdf9f01f886c15e7624","records":[{"revision":"14770e0a287b4cdf9f01f886c15e7624","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-w239-58x2-q8p5","aliases":["CVE-2026-42328","GO-2026-5684"],"title":"go-ipld-prime's DAG-CBOR and DAG-JSON decoders have unbounded recursion depth","description":"The DAG-CBOR and DAG-JSON decoders recurse on each nested map or list without a depth limit. A payload containing deeply nested collections causes the decoder to recurse once per level, growing the goroutine stack until the Go runtime terminates the process with a fatal stack overflow (distinct from a recoverable panic).\n\nFor DAG-CBOR, a payload of approximately 2 MB, consisting of repeated `0x81` (array-of-1) bytes followed by a terminator, produces around 2 million recursion frames and reliably exhausts Go's default 1 GB goroutine stack. The existing allocation budget does not prevent this: each nested collection header costs only a handful of budget units, so the stack is exhausted before the budget is. DAG-JSON has equivalent exposure via `[[[...]]]`-style payloads; it has no budget system and is therefore unprotected against recursion depth as well.\n\nSchema-free decoding (using `basicnode.Prototype.Any`) allows arbitrary nesting depth. Schema-bound decoding bounds nesting only when the schema itself is non-recursive and contains no fields typed as `Any`; schemas with recursive type references or any `Any`-typed fields permit unconstrained nesting at those points.\n\nThe fix adds a configurable `MaxDepth` option to both decoders, defaulting to 1024 nested levels. The decoder returns `ErrDecodeDepthExceeded` when a payload nests beyond the limit. Well-formed IPLD data rarely approaches this depth in practice; the default is generous for legitimate use while preventing stack exhaustion.","state":0,"publishedAt":"2026-05-07T02:07:21+00:00","modifiedAt":"2026-09-10T03:51:07.1048372+00:00","affected":[{"ecosystem":"Go","name":"github.com/ipld/go-ipld-prime","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"0.23.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/ipld/go-ipld-prime/security/advisories/GHSA-w239-58x2-q8p5","https://nvd.nist.gov/vuln/detail/CVE-2026-42328","https://github.com/ipld/go-ipld-prime"],"sourceUrl":"https://github.com/advisories/GHSA-w239-58x2-q8p5","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-w239-58x2-q8p5","identifiers":["GHSA-w239-58x2-q8p5","CVE-2026-42328","GO-2026-5684"]},"retained":false,"historicalAffected":[]}],"coverage":[]}