{"id":"RUSTSEC-2026-0404","title":"Double free in `DCtx::try_clone`","summary":"Double free in `DCtx::try_clone`","severity":"none","vendor":"zstd-safe","product":"zstd-safe","ecosystem":"rust","affected":["zstd-safe >= 8.0.0-0, < 8.2.0"],"patched":["zstd-safe 8.2.0"],"published":"2026-10-16","updated":"2026-11-02","sourceUpdated":"2026-11-02T09:30:04.168804805Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/RUSTSEC-2026-0404","references":[{"url":"https://crates.io/crates/zstd-safe"},{"url":"https://rustsec.org/advisories/RUSTSEC-2026-0404.html"},{"url":"https://github.com/gyscos/zstd-rs/commit/cee6529b553ec600a8e152aaca15a91598820ecf"},{"url":"https://github.com/gyscos/zstd-rs/pull/384"}],"tags":["osv","rust"],"ingestedAt":"2026-10-27T16:20:12.116Z","slug":"RUSTSEC-2026-0404","body":"## Overview\n\n`DCtx::try_clone` (`experimental` feature, deprecated) is a plain copy of the\nC context. A context owning a dictionary (from `load_dictionary`,\n`ref_prefix` or `init_using_dict`) or a dictionary table (`ref_ddict` with\n`RefMultipleDDicts`) ended up with both copies freeing it. A context cloned\nmid-frame resumed on uninitialized stream state. The clone also silently lost\nthe `WindowLogMax` limit.\n\nThe flaw was corrected by refusing to clone such contexts, and by carrying\nover the parameters the copy leaves out.\n\n## Affected packages\n\n- `zstd-safe >= 8.0.0-0, < 8.2.0`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `zstd-safe 8.2.0`","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}