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CVE-2026-55619— eml_parser: Parser DoS via deeply nested parentheses in e-mail headers

Quick assessment

Affected
GOVCERT-LU eml_parser
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

eml_parser 是一个用于解析 .eml 文件的 Python 模块，能够提取电子邮件中的各项信息以及计算生成相关信息。在 3.0.2 版本之前，eml_parser/parser.py 中的 HeaderParser.header_fetch_parse 方法使用 email.utils.getaddresses() 来解析包含电子邮件地址的头部字段。当遇到深层嵌套的 CFWS（Comment and Folding White Space）注释结构时，会耗尽标准库中递归下降解析器的调用栈，导致 Recur

CVSS 5.3 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
GOVCERT-LU eml_parser < 3.0.2 affected
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I. Basic Information for CVE-2026-55619

Vulnerability Information
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Vulnerability Title
eml_parser: Parser DoS via deeply nested parentheses in e-mail headers
Source: CVE Program / CVE List V5
Vulnerability 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 3.0.2, eml_parser.parser.HeaderParser.header_fetch_parse in eml_parser/parser.py uses email.utils.getaddresses() to parse address-bearing e-mail headers. A deeply nested CFWS comment construct exhausts the standard-library recursive descent parser's call stack and raises RecursionError, which is not caught and therefore aborts parsing of the entire message. An attacker can disrupt SOC pipelines that process untrusted EML files, although callers already need to handle exceptions from malformed or pathological messages. This issue is fixed in version 3.0.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
GOVCERT-LU eml_parser < 3.0.2 -

II. Public POCs for CVE-2026-55619

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III. Intelligence Information for CVE-2026-55619

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Patches & Fixes for CVE-2026-55619 (3)

Vendor Advisories for CVE-2026-55619 (1)

Same Patch Batch · GOVCERT-LU · 2026-08-25 · 3 CVEs total

CVE-2026-55620 7.5 HIGH eml_parser: DoS via deeply nested parens in Received headers
CVE-2026-55618 6.5 MEDIUM eml_parser: URL extraction bypass via HTML entities in URLs

IV. Related Vulnerabilities

Same product: eml_parser
Same vendor: GOVCERT-LU
Same weakness: CWE-770

V. Comments for CVE-2026-55619

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