CVE-2023-26118: 
JavaScript vulnerability analysis and mitigation

CVE-2023-26118 is a Regular Expression Denial of Service (ReDoS) vulnerability affecting versions of Angular from 1.4.9. The vulnerability exists in the input[url] functionality due to the usage of an insecure regular expression, which can be exploited through carefully-crafted input containing URL validation patterns. This vulnerability was disclosed on March 26, 2023, and published on March 29, 2023 (Snyk Advisory).

The vulnerability is caused by an inefficient regular expression implementation in Angular's URL validation mechanism. The issue is classified as CWE-1333 (Inefficient Regular Expression Complexity) and has been assigned a CVSS v3.1 base score of 5.3 (Medium). The vulnerability can be triggered when an input element with type="url" is provided with an invalid URL consisting of any scheme followed by a large number of slashes, leading to catastrophic backtracking in the regular expression engine (Snyk Advisory).

When successfully exploited, this vulnerability can cause excessive CPU consumption, resulting in reduced performance or temporary service interruptions. The impact is primarily on availability, with no direct effect on confidentiality or integrity. The service remains partially available but may experience significant performance degradation during exploitation (Snyk Advisory).

Currently, there is no fixed version available for the affected Angular packages. The vulnerability affects all versions from 1.4.9 onwards, and users are advised to monitor for updates or implement input validation controls at the application level (Snyk Advisory).