CVE-2026-32019 in OpenClaw
Summary
by MITRE • 03/20/2026
OpenClaw versions prior to 2026.2.22 contain incomplete IPv4 special-use range validation in the isPrivateIpv4() function, allowing requests to RFC-reserved ranges to bypass SSRF policy checks. Attackers with network reachability to special-use IPv4 ranges can exploit web_fetch functionality to access blocked addresses such as 198.18.0.0/15 and other non-global ranges.
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Analysis
by VulDB Data Team • 03/26/2026
The vulnerability identified as CVE-2026-32019 affects OpenClaw versions prior to 2026.2.22 and represents a critical security flaw in the application's handling of IPv4 address validation. This issue stems from an incomplete implementation of the isPrivateIpv4() function which is designed to identify private and special-use IPv4 addresses that should be restricted from external access. The flaw allows malicious actors to bypass server-side request forgery protections by exploiting the inadequate validation of RFC-reserved IPv4 ranges. The vulnerability specifically impacts the web_fetch functionality where requests to certain special-use ranges can circumvent security policies that should normally block access to these addresses. This represents a significant bypass of network security controls that are fundamental to preventing unauthorized access to internal network resources.
The technical implementation flaw lies within the incomplete IPv4 special-use range validation logic within the isPrivateIpv4() function. This function fails to properly identify and reject requests to RFC-reserved IPv4 addresses including the 198.18.0.0/15 range and other non-global address spaces that should be restricted from external access. The incomplete validation means that when the web_fetch functionality processes requests, it does not properly recognize that certain IPv4 addresses fall within special-use ranges that are designated for specific purposes and should not be accessible through external interfaces. This validation gap creates a pathway for attackers to make requests to addresses that are normally blocked by security policies but are allowed due to the flawed validation mechanism.
The operational impact of this vulnerability is substantial as it provides attackers with the ability to perform server-side request forgery attacks against internal network resources that should normally be protected. An attacker with network reachability to special-use IPv4 ranges can exploit this vulnerability to access addresses such as 198.18.0.0/15 which are designated for specific network testing and experimentation purposes. This access could potentially allow for reconnaissance of internal network topology, access to sensitive internal services, or exploitation of vulnerabilities in systems that are normally protected by network segmentation policies. The vulnerability essentially undermines the security boundary that should prevent external access to these special-use ranges, creating potential for data exfiltration, internal network enumeration, or further exploitation of internal systems.
This vulnerability maps to CWE-170, which describes improper null termination or improper handling of input validation, and aligns with ATT&CK technique T1190 for Proxy Pivoting and T1071.1004 for Application Layer Protocol: DNS. The incomplete validation of IPv4 address ranges represents a classic input validation failure where the system does not properly handle edge cases in address space validation. Organizations should immediately implement mitigations including updating to OpenClaw version 2026.2.22 or later, which contains the corrected validation logic. Additional mitigations include implementing network segmentation to isolate the web_fetch functionality, deploying network access controls to block access to special-use IPv4 ranges, and conducting thorough security testing to identify any other similar validation flaws in the application. Network monitoring should be enhanced to detect unusual patterns of access to special-use IPv4 ranges that may indicate exploitation attempts. The fix should ensure complete validation of all RFC-reserved IPv4 ranges including but not limited to the 198.18.0.0/15 range and other non-global address spaces that should remain protected from external access.