PatchTheCVECVE-2026-49942: Net::CIDR::Set versions through 0.20 for Perl did not validate network masks. The mask portion of a network m
CVE-2026-49942 is a high-severity flaw (CVSS 7.3) affecting net\. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- High severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.3 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.3% (top 77%) |
| CISA exploited list | No |
| Weakness | CWE-1289 |
| Published | 2026-06-04 |
| Last modified | 2026-07-22 |
Last updated 2026-07-22 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-49942?
net\: upgrade to 0.21. Exact commands for each OS are on this page.
Is CVE-2026-49942 being exploited?
CVE-2026-49942 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-49942 affect?
CVE-2026-49942 affects net\. Severity is high (CVSS 7.3). 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 netw
How urgent is CVE-2026-49942?
Priority 36/100. High severity; Remotely exploitable, no login, no user action
Software pages
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