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Vulnerability · Published Aug 25, 2026 · Assigned by GitHub_M

CVE-2026-55618eml_parser: URL extraction bypass via HTML entities in URLs

Medium 6.5

In plain English

A medium-severity security flaw in eml_parser from GOVCERT-LU. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.5%top 55.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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, 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
PyPIeml-parser3.0.2GHSA-fxgq-9m89-cxj9
PyPIeml-parser3.0.2PYSEC-2026-3831

Affected products (as reported)

VendorProductVersions
GOVCERT-LU eml_parser < 3.0.2

Weakness: CWE-116 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

References