GOVCERT-LU eml_parser up to 3.0.1 Header Parser eml_parser/parser.py eml_parser.parser.HeaderParser.header_fetch_parse recursion

Summaryinfo

A vulnerability marked as problematic has been reported in GOVCERT-LU eml_parser up to 3.0.1. The affected element is the function eml_parser.parser.HeaderParser.header_fetch_parse of the file eml_parser/parser.py of the component Header Parser. This manipulation causes recursion. This vulnerability appears as CVE-2026-55619. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability has been found in GOVCERT-LU eml_parser up to 3.0.1 and classified as problematic. Affected by this vulnerability is the function eml_parser.parser.HeaderParser.header_fetch_parse of the file eml_parser/parser.py of the component Header Parser. The manipulation with an unknown input leads to a recursion vulnerability. The CWE definition for the vulnerability is CWE-674. The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack. As an impact it is known to affect availability. The summary by CVE is:

eml_parser serves as a python module for parsing eml files and returning various information found in the e-mail as well as computed information. Prior to 3.0.2, eml_parser.parser.HeaderParser.header_fetch_parse in eml_parser/parser.py uses email.utils.getaddresses() to parse address-bearing e-mail headers. A deeply nested CFWS comment construct exhausts the standard-library recursive descent parser's call stack and raises RecursionError, which is not caught and therefore aborts parsing of the entire message. An attacker can disrupt SOC pipelines that process untrusted EML files, although callers already need to handle exceptions from malformed or pathological messages. This issue is fixed in version 3.0.2.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-55619 since 06/17/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Upgrading to version 3.0.2 eliminates this vulnerability.

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Productinfo

Vendor

• GOVCERT-LU

Name

• eml_parser

Version

• 3.0.0
• 3.0.1

Website

• Product: https://github.com/GOVCERT-LU/eml_parser/

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CPE 2.2info

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