CVE-2026-44844: GOVCERT-LU eml_parser uncontrolled recursion in get_raw_body_text

CVE-2026-44844 · Severity: medium · CVSS 4 · Published 2026-05-26

A vulnerability in the eml_parser library, which is used to process email files, can allow an attacker to crash the software. By sending a specially crafted email with many layers of nested attachments, an attacker can cause the system to stop responding or restart. This can disrupt email processing pipelines and lead to a denial of service for organizations relying on this tool.

Technologies: GOVCERT-LU Eml Parser, eml-parser (PyPI). Vendors: GOVCERT-LU, PyPI.

Quick answers

Is CVE-2026-44844 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-44844 being exploited in the wild.
How severe is CVE-2026-44844?
Medium severity, with a CVSS score of 4, published 26 May 2026.
Which products and versions are affected?
GOVCERT-LU Eml Parser <= 3.0.0; eml-parser (PyPI) ECOSYSTEM:introduced=0,fixed=3.0.1.
Is there a fix for CVE-2026-44844?
Yes. eml-parser (PyPI): upgrade to 3.0.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-44844 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-44844?
Check whether you run GOVCERT-LU Eml Parser or eml-parser (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • eml-parser (PyPI): upgrade to 3.0.1 or later
    pip install "eml-parser>=3.0.1"

Technical details

The EmlParser.get_raw_body_text() function in eml_parser/parser.py fails to implement a recursion depth limit when processing nested 'message/rfc822' attachments. An attacker can provide a crafted EML file (approximately 12 KB) with roughly 120 nested levels to exhaust CPython's default recursion limit, triggering an unhandled RecursionError. This crash propagates out of decode_email_bytes(), aborting the entire parsing process. The vulnerability is exploitable via the network without authentication in systems that ingest external emails. A fix is available in version 3.0.1 which implements recursion depth checks.

Affected products

  • GOVCERT-LU eml_parser <= 3.0.0

Identifiers

  • CVE-2026-44844
  • GHSA-g47v-rwmh-r9f8
  • PYSEC-2026-2468

Timeline

  • 2026-05-05: disclosed: Vulnerability reported to GOVCERT-LU/eml_parser
  • 2026-05-08: advisory: GitHub Advisory GHSA-g47v-rwmh-r9f8 published
  • 2026-05-26: other: NVD published CVE-2026-44844
  • 2026-06-08: other: Advisory last updated

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.