CVE-2026-45191
Description
A flaw was found in Net::CIDR::Lite. This vulnerability allows an attacker to bypass IP Access Control Lists (ACLs) by providing specially crafted CIDR (Classless Inter-Domain Routing) mask values. The component incorrectly processes mask forms containing extraneous zero characters, such as "/00" or "/01", leading to an unintended bypass of network access restrictions. This could result in unauthorized access.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.5 | N/A | 6.5 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | Low | N/A | None |
| Integrity Impact | Low | N/A | Low |
| Availability Impact | None | N/A | Low |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Application Data
An attacker may use an unexpected numerical base to access private application resources.
Integrity
Technical Impact: Bypass Protection Mechanism; Alter Execution Logic
An attacker may use an unexpected numerical base to bypass or manipulate access control mechanisms.
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