Application hang via non-linear case-insensitive parsing
Published Dec 18, 2024 · Updated Feb 21, 2025
Denial of service in golang.org/x/net/html before 0.33.0 allows remote attackers to hang consuming applications via crafted HTML. parseDoctype, htmlIntegrationPoint, inTableIM, and inBodyIM lowercase attacker-controlled strings before comparing them with short constants, making repeated case-insensitive checks non-linear. Exposure requires a consuming application to pass remote-supplied HTML to Parse, ParseFragment, ParseWithOptions, or ParseFragmentWithOptions.
Summary
What happened
Denial of service in golang.org/x/net/html before 0.33.0 allows remote attackers to hang consuming applications via crafted HTML. parseDoctype, htmlIntegrationPoint, inTableIM, and inBodyIM lowercase attacker-controlled strings before comparing them with short constants, making repeated case-insensitive checks non-linear. Exposure requires a consuming application to pass remote-supplied HTML to Parse, ParseFragment, ParseWithOptions, or ParseFragmentWithOptions.
The record
- CVE
- CVE-2024-45338
- Published
- Dec 18, 2024
- Updated
- Feb 21, 2025
- Vendor
- golang.org/x/net
- Product
- golang.org/x/net/html
- Classifications
- CWE-1333, CWE-770, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 18, 2024CVE publishedPublication date reported by the CVE source.
- Feb 21, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <0.33.0
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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