CVE-2026-49942

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.

CVSS v3.1 Score

7.3

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

EPSS — Exploit Prediction

0.0031

Probability of exploitation

0.23%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-1289 CWE-1289

Affected Products

Vendor	Product	Versions
rrwo	net\	< 0.21

References

Other References

https://metacpan.org/release/RRWO/Net-CIDR-Set-0.21/changes https://nvd.nist.gov/vuln/detail/CVE-2025-40911 https://nvd.nist.gov/vuln/detail/CVE-2026-45191

Frequently Asked Questions

What is CVE-2026-49942? +

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. It has a CVSS v3.1 base score of 7.3 (HIGH).

How severe is CVE-2026-49942? +

CVE-2026-49942 has a CVSS v3.1 score of 7.3 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0031, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-49942? +

CVE-2026-49942 affects products from rrwo, specifically: net\. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-49942? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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