What’s Vulnerable › Vulnerabilities

CVE-2021-26955

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-02-09 · updated 2026-06-17
• Weakness: CWE-252

Description

An issue was discovered in the xcb crate through 2021-02-04 for Rust. It has a soundness violation because xcb::xproto::GetAtomNameReply::name() calls std::str::from_utf8_unchecked() on unvalidated bytes from an X server.

Affected products

• Xcb Project Xcb: through 2021-02-04

References

• https://rustsec.org/advisories/RUSTSEC-2021-0019.html
• https://rustsec.org/advisories/RUSTSEC-2021-0019.html

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