CVE-2026-44844
MediumCVSS 6.3Exploitation Probability (EPSS)
Low risk32th percentile - higher than 32% of all known CVEs
Summary
In eml_parser before version 3.0.1, the EmlParser.get_raw_body_text() function recursively processes nested message/rfc822 attachments without any depth limit. An attacker can supply a crafted EML file with approximately 120 nested parts, causing an unhandled RecursionError and aborting parsing.
Risk Assessment
Even a small EML file (12 KB) can crash the parsing process, leading to denial of service (DoS) in systems using eml_parser.
Recommendation
It is recommended to upgrade eml_parser to version 3.0.1, which includes a fix limiting recursion depth.
Other vulnerabilities in eml_parser
See all- CVE-2026-55620High
eml_parser before version 3.0.2 has a quadratic-time regex-based loop in the noparenthesis function when processing Received: headers with nested parentheses. A single header with 5000 nested parentheses causes about 1.3 seconds of CPU saturation per message, and doubling the nesting depth quadruples the running time. Attackers can submit small EML files that consume multiple seconds of processing time, causing latency and potential outages.
- CVE-2026-55619Medium
eml_parser before version 3.0.2 contains a stack overflow vulnerability in the header_fetch_parse function when parsing nested CFWS constructs in email headers. An attacker can send a specially crafted EML file that causes an unhandled RecursionError and aborts parsing of the entire message. This can disrupt SOC pipelines processing untrusted EML files.
- CVE-2026-55618Medium
eml_parser before version 3.0.2 contains a vulnerability in the clean_found_uri function that incorrectly validates URLs before unescaping HTML entities for colon, slash, or period characters. As a result, valid encoded URLs and their hostnames are rejected and omitted from extracted URL and domain lists. Email security gateways and SOC pipelines using these lists as indicators of compromise may fail to submit hidden URLs to threat intelligence feeds, reputation services, or sandboxes, allowing malicious links to bypass inspection.
Original NVD description (English source)
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.