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CVE-2026-49941 RRWO CVE debrief

CVE-2026-49941 is a HIGH severity vulnerability in Net::CIDR::Set for Perl. Versions through 0.20 did not validate IP addresses, leading to potential denial of service (DoS) attacks. The `add` method called the `_encode` method to parse addresses. If the addresses did not look like netmasks or network ranges, they were assumed to be single IP addresses and passed back to itself as a 32-bit or 128-bit netmask. If the argument was not a well-formed IP address, this would lead to indefinite recursion. An attacker could use this to cause a denial of service.

Vendor
RRWO
Product
Net::CIDR::Set
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-04
Original CVE updated
2026-07-22
Advisory published
2026-06-04
Advisory updated
2026-07-22

Who should care

Users of Net::CIDR::Set for Perl, especially those using versions through 0.20, should be aware of this vulnerability and take steps to mitigate it.

Technical summary

The vulnerability exists in the Net::CIDR::Set module for Perl, specifically in versions through 0.20. The `add` method does not properly validate IP addresses, which can lead to indefinite recursion and a denial of service (DoS) attack.

Defensive priority

HIGH

Recommended defensive actions

  • Upgrade to version 0.21 or later of Net::CIDR::Set for Perl.
  • Review and validate IP addresses before passing them to the `add` method.

Evidence notes

The CVE-2026-49941 vulnerability was reported by Rrwo and has a CVSS score of 7.5. The vulnerability was published on 2026-06-04T17:16:33.173Z and modified on 2026-06-08T16:37:29.237Z.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-49941 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-49941

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-49941 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-49941

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Mitigation or vendor reference

    Unverified legacy reference

    URL: https://metacpan.org/release/RRWO/Net-CIDR-Set-0.21/changes

    9b29abf9-4ab0-4765-b253-1875cd9b441e - Release Notes

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.