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Security Advisories: GSA_kwCzR0hTQS1xNmNwLXFmd3EtNGdjds4AA6qI

h2 servers vulnerable to degradation of service with CONTINUATION Flood

An attacker can send a flood of CONTINUATION frames, causing h2 to process them indefinitely. This results in an increase in CPU usage.

Tokio task budget helps prevent this from a complete denial-of-service, as the server can still respond to legitimate requests, albeit with increased latency.

More details at https://seanmonstar.com/blog/hyper-http2-continuation-flood/.

Patches available for 0.4.x and 0.3.x versions.

Permalink: https://github.com/advisories/GHSA-q6cp-qfwq-4gcv
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1xNmNwLXFmd3EtNGdjds4AA6qI
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: 28 days ago
Updated: 28 days ago


CVSS Score: 5.3
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Identifiers: GHSA-q6cp-qfwq-4gcv
References: Blast Radius: 24.1

Affected Packages

cargo:h2
Dependent packages: 65
Dependent repositories: 34,976
Downloads: 135,383,838 total
Affected Version Ranges: >= 0.4.0, < 0.4.4, < 0.3.26
Fixed in: 0.4.4, 0.3.26
All affected versions: 0.0.0, 0.1.0, 0.1.1, 0.1.2, 0.1.3, 0.1.4, 0.1.5, 0.1.6, 0.1.7, 0.1.8, 0.1.9, 0.1.10, 0.1.11, 0.1.12, 0.1.13, 0.1.14, 0.1.15, 0.1.16, 0.1.17, 0.1.18, 0.1.19, 0.1.20, 0.1.21, 0.1.22, 0.1.23, 0.1.24, 0.1.25, 0.1.26, 0.2.0, 0.2.1, 0.2.2, 0.2.3, 0.2.4, 0.2.5, 0.2.6, 0.2.7, 0.3.0, 0.3.1, 0.3.2, 0.3.3, 0.3.4, 0.3.5, 0.3.6, 0.3.7, 0.3.8, 0.3.9, 0.3.10, 0.3.11, 0.3.12, 0.3.13, 0.3.14, 0.3.15, 0.3.16, 0.3.17, 0.3.18, 0.3.19, 0.3.20, 0.3.21, 0.3.22, 0.3.23, 0.3.24, 0.3.25, 0.4.0, 0.4.1, 0.4.2, 0.4.3
All unaffected versions: 0.3.26, 0.4.4