CVE-2026-6654

MEDIUM 5.1

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

CVSS Score

5.1

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	mozilla
Product	thin-vec
Ecosystems	Browser JavaScript
Industries	Technology
Published	Apr 20, 2026
Last Updated	Jul 15, 2026

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Affected Versions

Mozilla / thin-vec

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/mozilla/thin-vec/security/advisories/GHSA-xphw-cqx3-667j access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-6654 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2459689 security.access.redhat.com: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6654.json

Credits

Juhyung Son