An issue was discovered in the xcb crate through 2021-02-04 for Rust.
Priority MEDIUM 41CWE-252Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub.
Summary
An issue was discovered in the xcb crate through 2021-02-04 for Rust. It has a soundness violation because transmutation to the wrong type can happen after xcb::base::cast_event uses std::mem::transmute to return a reference to an arbitrary type.
Why it matters now
EPSS 0.01619 76th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed xcb (crates.io): 1.0.0
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | xcb (crates.io) | before 1.0.0 | 1.0.0 | Patch available | GHSA-3cj3-jrrp-9rxf |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- xcb (crates.io) Vendor— Affected before 1.0.0 Fixed in 1.0.0 Patch available GHSA-3cj3-jrrp-9rxf
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:xcb_project:xcb:*:*:*:*:*:rust:*:* | up to 2021-02-04 | Vulnerable | Xcb Project |
- cpe:2.3:a:xcb_project:xcb:*:*:*:*:*:rust:*:* Versions up to 2021-02-04 Vulnerable ·Xcb Project
Remediation
- Fix · GHSA-3cj3-jrrp-9rxf xcb (crates.io) Fixed in 1.0.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2021-26958
- 2026-10-03 Alias added: GHSA-3cj3-jrrp-9rxf
References
More Xcb Project Xcb vulnerabilities
- TI-2021-08556 An issue was discovered in the xcb crate through 2021-02-04 for Rust. CVSS 3.1CRITICAL 9.8
- TI-2021-08555 An issue was discovered in the xcb crate through 2021-02-04 for Rust. CVSS 3.1CRITICAL 9.8
- TI-2021-08554 An issue was discovered in the xcb crate through 2021-02-04 for Rust. CVSS 3.1CRITICAL 9.8
- TI-2020-18525 An issue was discovered in the xcb crate through 2020-12-10 for Rust. CVSS 3.1MEDIUM 5.5
Sources
- CVE-2021-26958 · CVE Program
- CVE-2021-26958 · NVD
- FIRST EPSS
- GHSA-3cj3-jrrp-9rxf · GitHub Advisory Database · CC BY 4.0
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