CVE-2026-45191: CWE-1289 Improper Validation of Unsafe Equivalence in Input in STIGTSP Net::CIDR::Lite
Net::CIDR::Lite versions before 0. 24 for Perl improperly validate CIDR mask values by allowing extraneous zero characters such as "/00" and "/01". These mask forms pass validation and parse to the same prefix as their unpadded equivalents, potentially enabling IP access control list (ACL) bypass. No patch or official remediation has been confirmed yet. There are no known exploits in the wild at this time.
AI Analysis
Technical Summary
The vulnerability in Net::CIDR::Lite (prior to version 0.24) arises from improper validation of CIDR mask inputs, specifically the acceptance of extraneous zero characters in mask values. This improper equivalence validation can cause different mask notations like "/00" and "/01" to be treated as equivalent to their unpadded forms, which may allow attackers to bypass IP-based ACLs relying on this module for CIDR parsing.
Potential Impact
If exploited, this vulnerability could allow an attacker to bypass IP ACLs that rely on Net::CIDR::Lite for CIDR mask validation and parsing. This could lead to unauthorized access or network filtering evasion. However, no known exploits are reported in the wild, and the exact impact depends on how the affected module is used in the environment.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, users should consider validating CIDR mask inputs externally or avoid relying solely on Net::CIDR::Lite for critical IP ACL enforcement. Monitor vendor channels for updates or patches addressing this issue.
CVE-2026-45191: CWE-1289 Improper Validation of Unsafe Equivalence in Input in STIGTSP Net::CIDR::Lite
Description
Net::CIDR::Lite versions before 0. 24 for Perl improperly validate CIDR mask values by allowing extraneous zero characters such as "/00" and "/01". These mask forms pass validation and parse to the same prefix as their unpadded equivalents, potentially enabling IP access control list (ACL) bypass. No patch or official remediation has been confirmed yet. There are no known exploits in the wild at this time.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in Net::CIDR::Lite (prior to version 0.24) arises from improper validation of CIDR mask inputs, specifically the acceptance of extraneous zero characters in mask values. This improper equivalence validation can cause different mask notations like "/00" and "/01" to be treated as equivalent to their unpadded forms, which may allow attackers to bypass IP-based ACLs relying on this module for CIDR parsing.
Potential Impact
If exploited, this vulnerability could allow an attacker to bypass IP ACLs that rely on Net::CIDR::Lite for CIDR mask validation and parsing. This could lead to unauthorized access or network filtering evasion. However, no known exploits are reported in the wild, and the exact impact depends on how the affected module is used in the environment.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, users should consider validating CIDR mask inputs externally or avoid relying solely on Net::CIDR::Lite for critical IP ACL enforcement. Monitor vendor channels for updates or patches addressing this issue.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- CPANSec
- Date Reserved
- 2026-05-10T16:36:05.708Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a00ec48cbff5d8610db9c4d
Added to database: 5/10/2026, 8:36:24 PM
Last enriched: 5/10/2026, 8:51:21 PM
Last updated: 5/10/2026, 9:38:43 PM
Views: 4
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