EML parsing abort via nested header comments
Published Aug 25, 2026 · Updated Aug 25, 2026
Denial of service in GOVCERT.LU eml_parser before 3.0.2 allows attackers to abort EML parsing via crafted address headers. HeaderParser.header_fetch_parse passes deeply nested CFWS comments to email.utils.getaddresses(), whose recursive descent exhausts the call stack; the resulting RecursionError propagates uncaught. The condition requires a caller to process an attacker-controlled EML message, while callers that isolate or catch parser exceptions limit the consequence to rejection of that message.
Summary
What happened
Denial of service in GOVCERT.LU eml_parser before 3.0.2 allows attackers to abort EML parsing via crafted address headers. HeaderParser.header_fetch_parse passes deeply nested CFWS comments to email.utils.getaddresses(), whose recursive descent exhausts the call stack; the resulting RecursionError propagates uncaught. The condition requires a caller to process an attacker-controlled EML message, while callers that isolate or catch parser exceptions limit the consequence to rejection of that message.
The record
- CVE
- CVE-2026-55619
- Published
- Aug 25, 2026
- Updated
- Aug 25, 2026
- Vendor
- GOVCERT.LU
- Product
- eml_parser
- Classifications
- CWE-770, CWE-1124, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 25, 2026CVE publishedPublication date reported by the CVE source.
- Aug 25, 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?
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- Affected versionversion=< 3.0.2
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What is affected?
Published CVSS scores
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Attacks
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Technologies
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