eml_parser: Parser DoS via deeply nested parentheses in e-mail headers

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-55619
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-25 19:16:50 UTC
Updated2026-08-25 20:16:57 UTC
Descriptioneml_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.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

EPSS: 0.003020000 probability, percentile 0.222610000 (date 2026-08-26)

Problem Types: CWE-770 | CWE-1124 | CWE-770 CWE-770: Allocation of Resources Without Limits or Throttling | CWE-1124 CWE-1124: Excessively Deep Nesting

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
3.1CNADECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA GOVCERT-LU Eml Parser affected < 3.0.2 Not specified

References

ReferenceSourceLinkTags
github.com/GOVCERT-LU/eml_parser/pull/90 [email protected] github.com
github.com/GOVCERT-LU/eml_parser/commit/746a69f86443eb0b6a47f77db3cfe727... [email protected] github.com
github.com/GOVCERT-LU/eml_parser/releases/tag/v3.0.2 [email protected] github.com
github.com/GOVCERT-LU/eml_parser/security/advisories/GHSA-m66c-fw79-6359 [email protected] github.com
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