{"id":"CVE-2023-23631","aliases":["GHSA-4gj3-6r43-3wfc","GO-2023-1559"],"title":"IPFS go-unixfsnode subject to DOS via HAMT Decoding Panics","summary":"IPFS go-unixfsnode subject to DOS via HAMT Decoding Panics","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","vendor":"ipfs","product":"github.com/ipfs/go-unixfsnode","ecosystem":"go","affected":["github.com/ipfs/go-unixfsnode < 1.5.2"],"patched":["github.com/ipfs/go-unixfsnode 1.5.2"],"published":"2023-02-10","updated":"2026-09-10","sourceUpdated":"2026-09-10T03:49:56.605610741Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-4gj3-6r43-3wfc","references":[{"url":"https://github.com/ipfs/go-unixfsnode/security/advisories/GHSA-4gj3-6r43-3wfc"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-23631"},{"url":"https://github.com/ipfs/go-unixfsnode/commit/59050ea8bc458ae55246ae09243e6e165923e076"},{"url":"https://github.com/ipfs/go-unixfsnode/commit/91b3d39d33ef0cd2aff2c95d50b2329350944b68"},{"url":"https://github.com/ipfs/go-unixfsnode/commit/a4ed723727e0bdc2277158337c2fc0d82802d122"},{"url":"https://github.com/ipfs/go-unixfsnode"},{"url":"https://pkg.go.dev/vuln/GO-2023-1559"}],"tags":["osv","go"],"epss":0.00908,"epssPercentile":0.5841,"ingestedAt":"2026-09-12T03:13:01.753Z","slug":"CVE-2023-23631","body":"## Overview\n\n## Impact\n\nTrying to read malformed HAMT sharded directories can cause panics and virtual memory leaks.\nIf you are reading untrusted user input, an attacker can then trigger a panic.\n\nThis is caused by a bogus fanout parameter in the HAMT directory nodes.\nThis includes checks returned in [ipfs/go-bitfield GHSA-2h6c-j3gf-xp9r](https://github.com/ipfs/go-bitfield/security/advisories/GHSA-2h6c-j3gf-xp9r), as well as limiting the fanout to <= 1024 (to avoid attempts of arbitrary sized allocations).\n\n## Patches\n- https://github.com/ipfs/go-unixfsnode/commit/91b3d39d33ef0cd2aff2c95d50b2329350944b68\n- https://github.com/ipfs/go-unixfsnode/commit/a4ed723727e0bdc2277158337c2fc0d82802d122\n\n## References\n\n* https://github.com/ipfs/go-unixfs/security/advisories/GHSA-q264-w97q-q778\n* https://github.com/ipfs/go-bitfield/security/advisories/GHSA-2h6c-j3gf-xp9r\n\n\n## Affected packages\n\n- `github.com/ipfs/go-unixfsnode < 1.5.2`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `github.com/ipfs/go-unixfsnode 1.5.2`","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}