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CVE-2023-43669 — Vulnerability in tungstenite — CVE Details

HIGH

Tungstenite allows remote attackers to cause a denial of service

Published September 21, 2023Updated September 10, 2026Source: osv

Summary

The Tungstenite crate through 0.20.0 for Rust allows remote attackers to cause a denial of service (minutes of CPU consumption) via an excessive length of an HTTP header in a client handshake. The length affects both how many times a parse is attempted (e.g., thousands of times) and the average amount of data for each parse attempt (e.g., millions of bytes).

Advisory Timeline

  • First published September 21, 2023 (1117 days ago).
  • Last revised September 10, 2026 — 1085 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Cargo
Update tungstenite to 0.20.1 or later
cargo update -p tungstenite --precise 0.20.1

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

Affected Packages (1)

Affects 1 ecosystem: crates.io (1).

PackageEcosystemAffectedFixed In
tungstenite
crates.io
All versions0.20.1

Vulnerability Classification

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

  • CWE-400
    Uncontrolled Resource ConsumptionMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 7.5 score means for each attack dimension.

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

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

References

Frequently Asked Questions

What is CVE-2023-43669?
Tungstenite allows remote attackers to cause a denial of service This vulnerability has been assigned a severity rating of HIGH (CVSS score: 7.5/10).
How do I check if my project is affected by CVE-2023-43669?
CVE-2023-43669 affects tungstenite. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2023-43669 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
7.5

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-9mcr-873m-xcxp
RUSTSEC-2023-0065

Related CVEs

  • CVE-2026-93657
    HIGH

    hickory-resolver: Resolver::lookup() and Resolver::lookup_ip() APIs obscure DNSSEC validation failures

  • CVE-2026-18140
    HIGH

    aws-smithy-json: Uncontrolled recursion in the aws-smithy-json unknown-key skip path allows unauthenticated remote denial of service in smithy-rs generated servers

More crates.io advisories

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