eml_parser: URL extraction bypass via HTML entities in URLs

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-55618
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-25 19:16:50 UTC
Updated2026-08-25 19:16:50 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, the clean_found_uri function in eml_parser/parser.py validates potential URL strings before unescaping HTML entities used for colon, slash, or period characters. Valid encoded URLs and their host names are therefore rejected and omitted from the extracted URL and domain lists. Email security gateways and SOC pipelines that use those lists as indicators of compromise may fail to submit the hidden URLs to threat intelligence feeds, reputation services, or sandboxes, allowing malicious links to bypass inspection. This issue is fixed in version 3.0.2.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

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

Problem Types: CWE-116 | CWE-116 CWE-116: Improper Encoding or Escaping of Output

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

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

References

ReferenceSourceLinkTags
github.com/GOVCERT-LU/eml_parser/security/advisories/GHSA-fxgq-9m89-cxj9 [email protected] github.com
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
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