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TI-2026-32722 Aliases CVE-2026-44844GHSA-g47v-rwmh-r9f8

eml_parser: Recursion DoS via nested message/rfc822 attachments

Priority MEDIUM 61CWE-674Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-674.

Summary

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 3.0.1, EmlParser.get_raw_body_text() recurses unconditionally for every nested message/rfc822 attachment without any depth limit. An attacker who can supply a badly crafted EML file with approximately 120 nested message/rfc822 parts triggers an unhandled RecursionError and aborts parsing of the message. A 12 KB EML file is enough to crash a worker. Though this causes the parser to crash, it is an unlikely scenario as the suggested EML that crashes the parser would not pass basic RFC compliance tests. This vulnerability is fixed in 3.0.1.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00396 34th percentileScored 2026-11-07
Fix Fixed eml_parser (GOVCERT-LU): 3.0.1eml_parser (PyPI): 3.0.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
GOVCERT-LUeml_parserbefore 3.0.13.0.1Patch availableCNA
—eml_parser (PyPI)before 3.0.13.0.1Patch availableGHSA-g47v-rwmh-r9f8
  • eml_parser VendorGOVCERT-LU Affected before 3.0.1 Fixed in 3.0.1 Patch available CNA
  • eml_parser (PyPI) Vendor— Affected before 3.0.1 Fixed in 3.0.1 Patch available GHSA-g47v-rwmh-r9f8

Remediation

  • Fix · CNA eml_parser (GOVCERT-LU) Fixed in 3.0.1
  • Fix · GHSA-g47v-rwmh-r9f8 eml_parser (PyPI) Fixed in 3.0.1 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-44844
  2. 2026-10-03 Alias added: GHSA-g47v-rwmh-r9f8

References

Advisory 1

Other 2

  • TI-2026-23366 eml_parser: Path Traversal in Official Example Script Leading to Arbitrary File Write CVSS 3.1MEDIUM 5.5
  • TI-2026-40149 eml_parser: DoS via deeply nested parens in Received headers CVSS 3.1HIGH 7.5
  • TI-2026-40148 eml_parser: Parser DoS via deeply nested parentheses in e-mail headers CVSS 3.1MEDIUM 5.3
  • TI-2026-40147 eml_parser: URL extraction bypass via HTML entities in URLs CVSS 3.1MEDIUM 6.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences