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Vulnerability record · CVE-2026-49942 · published 4 June 2026

CVE-2026-49942: Rrwo net\ vulnerability

RRrwo · Net\

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.

7.3 CVSS 3.1 High EPSS 0.49% · top 60.4% CWE-1289 · CWE-1289
7.3CVSS 3.1 base score
0.49%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
22 Jul 2026Last modified by NVD

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://metacpan.org/release/RRWO/Net-CIDR-Set-0.21/changes Release Notes
https://nvd.nist.gov/vuln/detail/CVE-2025-40911 Third Party AdvisoryUS Government Resource
https://nvd.nist.gov/vuln/detail/CVE-2026-45191 Third Party AdvisoryUS Government Resource

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.5CVE-2026-49941Rrwo net\ vulnerabilityNet::CIDR::Set versions through 0.20 for Perl did not validate IP addresses. The add method called the _encode method to parse addresses. If the addr…EPSS 0.49%6.5CVE-2026-49940Rrwo net\ vulnerabilityNet::CIDR::Set versions through 0.20 for Perl accept non-ASCII IP addresses and netmasks. Unicode digits such as the Arabic-Indic One (U+0661) were a…EPSS 0.30%6.5CVE-2026-48710Starlette Host header validation flaw enables request.url path mismatchStarlette before 1.0.1 did not validate the HTTP Host header before using it to rebuild request.url, so a malformed Host value could make request.url…KEVEPSS 7.1%analysed

Source: NIST National Vulnerability Database (record CVE-2026-49942), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.