What’s Vulnerable › Vulnerabilities

CVE-2026-6654: Use-After-Free and Double-Free in IntoIter::drop when element drop panics

• Severity: medium (CVSS 5.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-04-20 · updated 2026-10-26
• Weakness: CWE-415

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.

Affected products

• Mozilla Thin-Vec: 0.2.15

References

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

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