CVE-2026-6654: Vulnerability in Mozilla thin-vec
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.
AI Analysis
Technical Summary
This vulnerability in the thin-vec Rust crate maintained by Mozilla involves double-free and use-after-free bugs triggered when a panic occurs during the drop_in_place operation. Specifically, the length field is not reset to zero after a panic, causing subsequent operations to access freed memory. The affected functions are IntoIter::drop and ThinVec::clear. No CVSS score or patch information is currently available.
Potential Impact
The vulnerability can lead to memory safety issues such as double-free and use-after-free, which may cause application crashes or undefined behavior. There is no evidence of active exploitation in the wild. The impact is limited to applications using the thin-vec crate and invoking the affected functions under panic conditions.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, users should monitor official Mozilla or thin-vec project communications for updates. No specific workaround or mitigation is provided at this time.
CVE-2026-6654: Vulnerability in Mozilla thin-vec
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 5.1medium
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in the thin-vec Rust crate maintained by Mozilla involves double-free and use-after-free bugs triggered when a panic occurs during the drop_in_place operation. Specifically, the length field is not reset to zero after a panic, causing subsequent operations to access freed memory. The affected functions are IntoIter::drop and ThinVec::clear. No CVSS score or patch information is currently available.
Potential Impact
The vulnerability can lead to memory safety issues such as double-free and use-after-free, which may cause application crashes or undefined behavior. There is no evidence of active exploitation in the wild. The impact is limited to applications using the thin-vec crate and invoking the affected functions under panic conditions.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, users should monitor official Mozilla or thin-vec project communications for updates. No specific workaround or mitigation is provided at this time.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-04-20T07:02:28.158Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69e603f619fe3cd2cdd9a5d7
Added to database: 4/20/2026, 10:46:14 AM
Last enriched: 4/20/2026, 11:01:12 AM
Last updated: 6/3/2026, 6:47:53 PM
Views: 80
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