Excessively Deep Nesting Affecting eml-parser package, versions [,3.0.2)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-EMLPARSER-20158946
- published27 Sept 2026
- disclosed25 Aug 2026
- creditUnknown
Introduced: 25 Aug 2026
CVE-2026-55619 (opens in a new tab)How to fix?
Upgrade eml-parser to version 3.0.2 or higher.
Overview
eml-parser is a Python EML parser library
Affected versions of this package are vulnerable to Excessively Deep Nesting in the parsing process of e-mail headers containing deeply nested parentheses. An attacker can cause the application to exhaust the call stack and terminate unexpectedly by submitting specially crafted e-mail headers with deeply nested CFWS constructs.
Workaround
This vulnerability can be mitigated by wrapping calls to decode_email or decode_email_bytes in a try/except construct to handle RecursionError exceptions.