Application hang via catastrophic regex backtracking
Published Jul 14, 2025 · Updated Jul 14, 2025
ReDoS in rank/server.js in Chinese Poetry chinese-poetry 0.1 allows remote authenticated users to block the Node.js event loop. The HTML-cleaning replace operation applies overlapping greedy and lazy wildcards to attacker-controlled markup lacking a closing script or style tag, forcing catastrophic backtracking. Low-privileged network access is required, and a crafted request can saturate CPU and hang the application process.
Summary
What happened
ReDoS in rank/server.js in Chinese Poetry chinese-poetry 0.1 allows remote authenticated users to block the Node.js event loop. The HTML-cleaning replace operation applies overlapping greedy and lazy wildcards to attacker-controlled markup lacking a closing script or style tag, forcing catastrophic backtracking. Low-privileged network access is required, and a crafted request can saturate CPU and hang the application process.
The record
- CVE
- CVE-2025-7579
- Published
- Jul 14, 2025
- Updated
- Jul 14, 2025
- Vendor
- Chinese Poetry
- Product
- chinese-poetry
- Classifications
- CWE-400, CWE-1333, T1499.004
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 14, 2025CVE publishedPublication date reported by the CVE source.
- Jul 14, 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?
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- Affected versionversion=0.1
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
- rank/server.js ReDoS proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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