CVE-2026-6654

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

State: Published
Severity: 5.1 Medium
Published: Apr 20, 2026
Updated: Jul 15, 2026
Reserved: Apr 20, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	5.1 Medium	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N	CISA-ADP
3.1	7.3 High	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H	redhat-SADP

Weaknesses

CWE-415 Double Free
CWE-416 Use After Free
CWE-1341 Multiple Releases of Same Resource or Handle

Affected Products

Product	Versions
thin-vecMozilla	0.2.16 and laterNot affected

References

https://github.com/mozilla/thin-vec/security/advisories/GHSA-xphw-cqx3-667j
https://access.redhat.com/security/cve/CVE-2026-6654vdb-entry
RHBZ#2459689issue-tracking
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6654.json

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