CVE-2026-6654

MEDIUM

Published Apr 20, 2026 Modified May 12, 2026 CWE-415 CWE-416

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.

CVSS v3.1 Score

5.1

MEDIUM

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

EPSS — Exploit Prediction

0.0002

Probability of exploitation

0.03%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-415 CWE-415

CWE-416 Use After Free

Affected Products

Vendor	Product	Versions
mozilla	thin-vec	All

References

Advisories & Patches

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

Exploits

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

Frequently Asked Questions

What is CVE-2026-6654? +

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. It has a CVSS v3.1 base score of 5.1 (MEDIUM).

How severe is CVE-2026-6654? +

CVE-2026-6654 has a CVSS v3.1 score of 5.1 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0002, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-6654? +

CVE-2026-6654 affects products from mozilla, specifically: thin-vec. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-6654? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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