CVE-2026-49942
Net::CIDR::Set versions through 0.20 for Perl did not validate network masks
Description
Net::CIDR::Set versions through 0.20 for Perl did not validate network masks. The mask portion of a network mask could contain Unicode digits such as the Arabic-Indic One (U+0661), or non-digits, which were ignored. This could allow network masks to accept larger networks. Leading zeros were also accepted, but treated as decimal instead of octal. This could lead to confusion about what networks are acceptable.
INFO
Published Date :
June 4, 2026, 5:16 p.m.
Last Modified :
June 8, 2026, 4:37 p.m.
Remotely Exploit :
Yes !
Source :
9b29abf9-4ab0-4765-b253-1875cd9b441e
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Update the Net::CIDR::Set Perl module.
- Validate network mask inputs.
- Ensure proper octal interpretation of leading zeros.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-49942.
| URL | Resource |
|---|---|
| https://metacpan.org/release/RRWO/Net-CIDR-Set-0.21/changes | Release Notes |
| https://nvd.nist.gov/vuln/detail/CVE-2025-40911 | Third Party Advisory US Government Resource |
| https://nvd.nist.gov/vuln/detail/CVE-2026-45191 | Third Party Advisory US Government Resource |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-49942 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-49942
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-49942 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-49942 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jun. 08, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:rrwo:net::cidr::set:*:*:*:*:*:perl:*:* versions up to (excluding) 0.21 Added Reference Type CPANSec: https://metacpan.org/release/RRWO/Net-CIDR-Set-0.21/changes Types: Release Notes Added Reference Type CPANSec: https://nvd.nist.gov/vuln/detail/CVE-2025-40911 Types: Third Party Advisory, US Government Resource Added Reference Type CPANSec: https://nvd.nist.gov/vuln/detail/CVE-2026-45191 Types: Third Party Advisory, US Government Resource -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 04, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L -
New CVE Received by 9b29abf9-4ab0-4765-b253-1875cd9b441e
Jun. 04, 2026
Action Type Old Value New Value Added Description Net::CIDR::Set versions through 0.20 for Perl did not validate network masks. The mask portion of a network mask could contain Unicode digits such as the Arabic-Indic One (U+0661), or non-digits, which were ignored. This could allow network masks to accept larger networks. Leading zeros were also accepted, but treated as decimal instead of octal. This could lead to confusion about what networks are acceptable. Added CWE CWE-1289 Added Reference https://metacpan.org/release/RRWO/Net-CIDR-Set-0.21/changes Added Reference https://nvd.nist.gov/vuln/detail/CVE-2025-40911 Added Reference https://nvd.nist.gov/vuln/detail/CVE-2026-45191