Vulnerability · Published May 26, 2026 · Assigned by GitHub_M

CVE-2026-44844eml_parser: Recursion DoS via nested message/rfc822 attachments

Medium 6.3

In plain English

A medium-severity security flaw in eml_parser from GOVCERT-LU. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 34% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.3Medium

Exploit odds (30 days)0.4%top 66.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

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 3.0.1, 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	eml-parser	3.0.1	GHSA-g47v-rwmh-r9f8
PyPI	eml-parser	3.0.1	PYSEC-2026-2468

Affected products (as reported)

Vendor	Product	Versions
GOVCERT-LU	eml_parser	< 3.0.1

Weakness: CWE-674 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

References

https://github.com/GOVCERT-LU/eml_parser/security/advisories/GHSA-g47v-rwmh-r9f8 x_refsource_CONFIRM