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CVE-2021-26955 — Out of bounds read in xcb — CVE Details

CRITICAL

Out of bounds read in xcb

Published August 25, 2021Updated March 15, 2024Source: osv

Summary

An issue was discovered in the xcb crate through 2021-02-04 for Rust. It has a soundness violation because there is an out-of-bounds read in xcb::xproto::change_property(), as demonstrated by a format=32 T=u8 situation where out-of-bounds bytes are sent to an X server.

Advisory Timeline

  • First published August 25, 2021 (1874 days ago).
  • Last revised March 15, 2024 — 932 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Cargo
Update xcb to 1.0.0 or later
cargo update -p xcb --precise 1.0.0

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: crates.io (1).

PackageEcosystemAffectedFixed In
xcb
crates.io
All versions1.0.0

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-125
    Out-of-bounds ReadMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.8 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Frequently Asked Questions

What is CVE-2021-26955?
Out of bounds read in xcb This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.8/10).
How do I check if my project is affected by CVE-2021-26955?
CVE-2021-26955 affects xcb. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2021-26955 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.8

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-2xpg-3hx4-fm9r
CVE-2021-26956
CVE-2021-26957
CVE-2021-26958
GHSA-3288-cwgw-ch86
GHSA-3cj3-jrrp-9rxf
GHSA-mp6r-fgw2-rxfx
RUSTSEC-2021-0019

Related CVEs

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