Service hang via inefficient email-validation regex
Published Jun 24, 2022 · Updated Aug 4, 2024
Regular expression denial of service in validate-data 0.1.1 allows remote attackers to hang Node.js services via crafted invalid emails. The email validator applies its regular expression to arbitrarily long attacker-controlled strings; a failing match incurs excessive backtracking and CPU time. A network endpoint that passes unbounded email input to the library exposes its Node.js process to unauthenticated service interruption.
Summary
What happened
Regular expression denial of service in validate-data 0.1.1 allows remote attackers to hang Node.js services via crafted invalid emails. The email validator applies its regular expression to arbitrarily long attacker-controlled strings; a failing match incurs excessive backtracking and CPU time. A network endpoint that passes unbounded email input to the library exposes its Node.js process to unauthenticated service interruption.
The record
- CVE
- CVE-2021-40893
- Published
- Jun 24, 2022
- Updated
- Aug 4, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-1333, CAPEC-492, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 24, 2022CVE publishedPublication date reported by the CVE source.
- Aug 4, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
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
- validate-data ReDoS timing proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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