Service interruption via unbounded email regex
Published Dec 27, 2022 · Updated Apr 11, 2025
Regular expression denial of service in nmanousos email-existence 0.1.6 and earlier allows remote attackers to interrupt service via a long email. The exported check function tests unbounded input against /^\S+@\S+$/, whose repeated non-whitespace matches cause excessive processing before rejection. Network exposure depends on a consuming application passing attacker-controlled email strings to the library; the consequence is prolonged CPU-bound processing and service interruption, not data access or modification.
Summary
What happened
Regular expression denial of service in nmanousos email-existence 0.1.6 and earlier allows remote attackers to interrupt service via a long email. The exported check function tests unbounded input against /^\S+@\S+$/, whose repeated non-whitespace matches cause excessive processing before rejection. Network exposure depends on a consuming application passing attacker-controlled email strings to the library; the consequence is prolonged CPU-bound processing and service interruption, not data access or modification.
The record
- CVE
- CVE-2018-25049
- Published
- Dec 27, 2022
- Updated
- Apr 11, 2025
- Vendor
- nmanousos
- Product
- email-existence
- Classifications
- CWE-1333, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 27, 2022CVE publishedPublication date reported by the CVE source.
- Apr 11, 2025Record updatedLatest update available in the CVE record.
Exploitability
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- Affected versionversion=n/a
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What is affected?
Attacks
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