Net::CIDR::Set versions through 0.20 for Perl did not validate network masks
Priority LOW 38CWE-1289Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- Low · Low · Low
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.
Summary
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 it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.003 22nd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-49942
- 2026-10-03 Alias added: GHSA-fff7-gx98-vr3g
References
More RRWO Net vulnerabilities
- TI-2026-36790 Uncontrolled recursion in RRWO Net::CIDR::Set CVSS 3.1HIGH 7.5
- TI-2026-36789 Net::CIDR::Set versions through 0.20 for Perl accept non-ASCII IP addresses and netmasks CVSS 3.1MEDIUM 6.5
Sources
- CVE-2026-49942 · CVE Program
- CVE-2026-49942 · NVD
- FIRST EPSS
- GHSA-fff7-gx98-vr3g · GitHub Advisory Database · CC BY 4.0
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