Is CVE-2021-26958 actively exploited?

No active exploitation of CVE-2021-26958 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-26958 be exploited remotely?

Yes. CVE-2021-26958 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-26958?

CVE-2021-26958 has a CVSS score of 8.8 (HIGH).

HOME VULNERABILITIESCVE-2021-26958

HIGH

CVE-2021-26958

CWE-252Published: February 9, 2021· Updated: Jun 17, 2026

8.8

CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2021-26958 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.