Service hang via table-tag parser state loop
Published Feb 5, 2026 · Updated Feb 5, 2026
Infinite-loop parsing in golang.org/x/net/html before 0.45.0 allows remote attackers to hang applications via crafted HTML. The inRowIM table-row insertion mode mishandles specific combinations of table-related tags, repeatedly reprocessing a token without advancing parser state. Exposure requires an application to pass attacker-controlled HTML to Parse, ParseFragment, ParseWithOptions, or ParseFragmentWithOptions; the loop consumes CPU and can exhaust memory until the process stops responding.
Summary
What happened
Infinite-loop parsing in golang.org/x/net/html before 0.45.0 allows remote attackers to hang applications via crafted HTML. The inRowIM table-row insertion mode mishandles specific combinations of table-related tags, repeatedly reprocessing a token without advancing parser state. Exposure requires an application to pass attacker-controlled HTML to Parse, ParseFragment, ParseWithOptions, or ParseFragmentWithOptions; the loop consumes CPU and can exhaust memory until the process stops responding.
The record
- CVE
- CVE-2025-58190
- Published
- Feb 5, 2026
- Updated
- Feb 5, 2026
- Vendor
- golang.org/x/net
- Product
- golang.org/x/net/html
- Classifications
- CWE-835, T1499.003
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 5, 2026CVE publishedPublication date reported by the CVE source.
- Feb 5, 2026Record 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 <0.45.0
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
- ParseFragment out-of-memory reproducerproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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