CVE-2026-6654

MEDIUM

Use-After-Free and Double-Free in IntoIter::drop when element drop panics

Title source: cna

Description

Double-Free / Use-After-Free (UAF) in the `IntoIter::drop` and `ThinVec::clear` functions in the thin_vec crate. A panic in `ptr::drop_in_place` skips setting the length to zero.

References (1)

Core 1

Core References

https://github.com/mozilla/thin-vec/security/advisories/GHSA-xphw-cqx3-667j

Scores

CVSS v3 5.1

EPSS 0.0014

EPSS Percentile 3.5%

Attack Vector LOCAL

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-415 CWE-416

Status published

Products (3)

crates.io/thin-vec 0 - 0.2.16crates.io

mozilla/thin-vec 0.2.15

Mozilla/thin-vec 0.2.16

Published Apr 20, 2026

Tracked Since Apr 20, 2026