{"id":"RUSTSEC-2026-0398","aliases":[],"status":"published","title":"`Seekable::decompress` sets a `Vec` length beyond its capacity for offsets past the end","description":"`ZSTD_seekable_decompress` shortens the requested length to the end of the\ndata without checking that the offset is before it. For an offset past the\nend, it returns a wrapped-around length without writing anything, and\n`Seekable::decompress` passed that length to `Vec::set_len`.\n\nWith the `seekable` feature, whoever supplies the archive, or chooses the\noffset, can leave the caller's `Vec\u003cu8\u003e` with a length far beyond its\ncapacity. Reading it then discloses neighbouring heap memory, and appending\nto it corrupts memory. Offsets near `u64::MAX` can also hang the call.\n\nThe flaw was corrected by clamping requests to the end of the data, and by\nchecking every count reported by the C library against the buffer capacity.","facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"published":"2026-10-16T12:00:00Z","modified":"2026-11-02T09:30:03Z","fixes":[{"ecosystem":"crates.io","package":"zstd-safe","fixed_in":["7.4.0","8.2.0"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"crates.io","package":"zstd-safe","ranges":[{"type":"SEMVER","events":[{"introduced":"7.2.2"},{"fixed":"7.4.0"},{"introduced":"8.0.0-0"},{"fixed":"8.2.0"}]}]}],"references":[{"url":"https://crates.io/crates/zstd-safe","tags":["package"]},{"url":"https://rustsec.org/advisories/RUSTSEC-2026-0398.html","tags":["advisory"]},{"url":"https://github.com/gyscos/zstd-rs/commit/80506be743fae2ed0c2fe8b21c374c6a2eab0be7","tags":["web"]},{"url":"https://github.com/gyscos/zstd-rs/pull/384","tags":["web"]}],"sources":{"osv":[{"id":"RUSTSEC-2026-0398","title":"`Seekable::decompress` sets a `Vec` length beyond its capacity for offsets past the end","description":"`ZSTD_seekable_decompress` shortens the requested length to the end of the\ndata without checking that the offset is before it. For an offset past the\nend, it returns a wrapped-around length without writing anything, and\n`Seekable::decompress` passed that length to `Vec::set_len`.\n\nWith the `seekable` feature, whoever supplies the archive, or chooses the\noffset, can leave the caller's `Vec\u003cu8\u003e` with a length far beyond its\ncapacity. Reading it then discloses neighbouring heap memory, and appending\nto it corrupts memory. Offsets near `u64::MAX` can also hang the call.\n\nThe flaw was corrected by clamping requests to the end of the data, and by\nchecking every count reported by the C library against the buffer capacity.","status":"published","published":"2026-10-16T12:00:00Z","modified":"2026-11-02T09:30:03.419709171Z","updated_at":"2026-11-02T15:53:40.430679Z"}]}}