{"aliases":[],"categories":["denial-of-service"],"crate":"ruzstd","cves":[],"cvss":0.0,"database_specific":{"severity":"high"},"date":"2026-10-11","deb_packages":[{"crate_name":"czkawka-cli","deb_name":"czkawka-cli","version":"12.0.2-2"},{"crate_name":"czkawka-gui","deb_name":"czkawka-gui","version":"12.0.2-1"},{"crate_name":null,"deb_name":"dwarf2sources","version":"0.2.6-1+b2"},{"crate_name":"elfx86exts","deb_name":"elfx86exts","version":"0.6.2-5"},{"crate_name":"feluda","deb_name":"feluda","version":"1.17.0-2"},{"crate_name":"ruzstd","deb_name":"librust-ruzstd-dev","version":"0.8.3-2"},{"crate_name":"repro-env","deb_name":"repro-env","version":"0.4.4+ds-1"},{"crate_name":"samply","deb_name":"samply","version":"0.13.1-1+b2"},{"crate_name":"xh","deb_name":"xh","version":"0.26.3-1"}],"description":"A crafted `.zst` input under 128 KB can force `ruzstd` to allocate several gigabytes at once, crashing the process with an out-of-memory condition. Since `ruzstd` is a decoder for untrusted input, a single small file is enough to take down anything decoding it.\n\nThe compressed size of a block was capped at 128 KB, but a compressed block's **decompressed** size was never checked against `Block_Maximum_Size = min(Window_Size, 128 KiB)` (RFC 8878). In `execute_sequences` the output was built with no running bound and no flush between blocks, so one block could expand to gigabytes — bypassing both the configured window-size limit and the block-by-block streaming that would otherwise release memory. (A related `u32` counter overflow on such a block caused an additional panic.)\n\nThis is a denial of service only; memory access stays in bounds (no corruption, no RCE).\n\n`ruzstd` is also built as a dependency of the Rust standard library via `rustc-dep-of-std`; in the toolchain it is used only to load zstd-compressed debug symbols, so the toolchain-side impact is limited.\n\n**Fixed in 0.9.1** (commit `d3907c9`), which enforces the per-block output bound. Upgrade to `ruzstd >= 0.9.1`.","id":"RUSTSEC-2026-0344","keywords":["zstd","decompression-bomb","oom"],"patched_versions":[">=0.9.1"],"source":"debian_rustsec","title":"Decompression bomb in `ruzstd`: a tiny input can exhaust memory (OOM)","url":"https://github.com/KillingSpark/zstd-rs/commit/d3907c960ca4a1aa44cc38340137c5679dd98f5a"}