CVE-2026-6654: thin-vec: Use-After-Free and Double Free in IntoIter::drop When Element Drop Panics

April 15, 2026 (updated May 5, 2026)

A Double Free / Use-After-Free (UAF) vulnerability has been identified in the IntoIter::drop and ThinVec::clear implementations of the thin_vec crate. Both vulnerabilities share the same root cause and can trigger memory corruption using only safe Rust code — no unsafe blocks required. Undefined Behavior has been confirmed via Miri and AddressSanitizer (ASAN).

References

github.com/advisories/GHSA-xphw-cqx3-667j
github.com/mozilla/thin-vec
github.com/mozilla/thin-vec/security/advisories/GHSA-xphw-cqx3-667j
nvd.nist.gov/vuln/detail/CVE-2026-6654
rustsec.org/advisories/RUSTSEC-2026-0103.html

Code Behaviors & Features

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