EUVD-2026-12862Lifecycle Timeline
3DescriptionCVE.org
An issue in the VirtualHost configuration handling/parser component of aaPanel v7.57.0 allows attackers to cause a Regular Expression Denial of Service (ReDoS) via a crafted input.
AnalysisAI
A Regular Expression Denial of Service (ReDoS) vulnerability exists in aaPanel v7.57.0's VirtualHost configuration handling and parser component, allowing attackers to trigger catastrophic backtracking in regex pattern matching through specially crafted input. This vulnerability affects the aaPanel web server control panel management system, enabling unauthenticated or authenticated attackers to exhaust server resources and cause service unavailability. The vulnerability has been documented in public repositories including the mbiesiad vulnerability research project, indicating proof-of-concept or technical details may be available.
Technical ContextAI
The vulnerability resides in the VirtualHost configuration parser component of aaPanel, a popular Linux server control panel. VirtualHost configurations typically involve parsing and validating domain names, paths, and routing rules through regular expressions. ReDoS vulnerabilities (CWE-1333 or related regex denial of service patterns) occur when a regular expression engine encounters input that causes exponential backtracking, typically in patterns with nested quantifiers or alternation without proper anchoring. aaPanel v7.57.0 uses a regex pattern in its VirtualHost parser that lacks proper optimization or input validation, allowing an attacker to craft malicious configuration input—such as an oversized or specially structured virtual host entry—that forces the regex engine into catastrophic backtracking, consuming CPU cycles and memory until the service becomes unresponsive.
RemediationAI
Immediately upgrade aaPanel to the latest patched version released by the aaPanel development team; check https://github.com/aapanel/aapanel for the current stable release and security advisories. Until patching is completed, implement network-level mitigations: restrict access to aaPanel's web management interface to trusted IP ranges only, use a reverse proxy (such as nginx or HAProxy) with rate limiting and request size limits to prevent oversized VirtualHost configuration submissions, and consider disabling dynamic VirtualHost configuration uploads if not actively required. Monitor CPU and memory usage during the interim period to detect exploitation attempts. Additionally, review all existing VirtualHost configurations for any suspicious or malformed entries that may have already been injected.
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External POC / Exploit Code
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