An information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks via a crafted DNS packet with RFC 7871 client subnet information.

Code

The project this record applies to. Exploit listings stay in References.

• Repository · github.com
• Repository · github.com

Timeline

Detection, updates, and resolution for this record.

1. May 11, 2026 · NIST NVD

   Detected

   An information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks via a crafted DNS packet with RFC 7871 client subnet information.

2. Jun 17, 2026 · NIST NVD

   Updated

   An information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks via a crafted DNS packet with RFC 7871 client subnet information.

Sources

• CVE.orgVulnerability recordCVE-2026-4893

  Official CVE identifier

  cve.org
• NIST NVDVulnerability recordCVE-2026-4893

  An information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks via a crafted DNS packet with RFC 7871 client subnet information.

  nvd.nist.gov

References

• Reference · github.com
• Reference · github.com
• Reference · github.com
• Reference · lists.thekelleys.org.uk
• Reference · thekelleys.org.uk
• Reference · kb.cert.org