CVE-2026-30871

critical Red Hat
CVSS v3 Base Score
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Characteristics
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Confidentiality
High
Integrity
High
Availability
High
Published: March 19, 2026 (55 days ago)
Last Modified: March 19, 2026
Vendor: Red Hat
Source: REDHAT

Description

A flaw was found in the OpenWrt mdns daemon. A remote attacker can exploit a Stack-based Buffer Overflow vulnerability in the `parse_question` function by sending specially crafted DNS (Domain Name System) packets. These packets, specifically PTR (Pointer Record) queries for reverse DNS domains, can cause the `dn_expand` function to inflate the size of the expanded name. This inflated name is then copied into a smaller fixed-size buffer using an unbounded copy operation, leading to a buffer overflow. This can result in arbitrary code execution or a denial of service (DoS) on the affected device.

CWE

CWE-120

References

🔗 bugzilla.redhat.com 🔗 www.cve.org 🔗 nvd.nist.gov 🔗 github.com 🔗 github.com