CVE-2026-6654
CVE-2026-6654 is a medium-severity vulnerability in Mozilla Thin-vec with a CVSS 3.x base score of 5.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-415.
Key facts
- Severity: Medium (CVSS 3.x base score 5.1)
- EPSS exploit prediction: 0% (6th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-23832
- Weakness: CWE-415
- Affected product: Mozilla Thin-vec
- Published:
- Last modified:
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.
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.
- How severe is CVE-2026-6654?
- CVE-2026-6654 has a CVSS 3.x base score of 5.1, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
- Is CVE-2026-6654 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-6654?
- CVE-2026-6654 affects Mozilla Thin-vec. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-6654?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-6654 have an EU (EUVD) identifier?
- Yes. CVE-2026-6654 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23832.
- When was CVE-2026-6654 published?
- CVE-2026-6654 was published on 2026-04-20 and last updated on 2026-06-30.
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
Affected products (1)
- cpe:2.3:a:mozilla:thin-vec:0.2.15:*:*:*:*:rust:*:*
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