PT-2026-26381 · Openwrt · Openwrt

Aparcar + 2 · Published 2026-03-19 · Updated 2026-03-19 · CVE-2026-30872

NVD

CVSS v4.0

9.5

Critical

AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

OpenWrt Project is a Linux operating system targeting embedded devices. In versions prior to 24.10.6 and 25.12.1, the mdns daemon has a Stack-based Buffer Overflow vulnerability in the match ipv6 addresses function, triggered when processing PTR queries for IPv6 reverse DNS domains (.ip6.arpa) received via multicast DNS on UDP port 5353. During processing, the domain name from name buffer is copied via strcpy into a fixed 256-byte stack buffer, and then the reverse IPv6 request is extracted into a buffer of only 46 bytes (INET6 ADDRSTRLEN). Because the length of the data is never validated before this extraction, an attacker can supply input larger than 46 bytes, causing an out-of-bounds write. This allows a specially crafted DNS query to overflow the stack buffer in match ipv6 addresses, potentially enabling remote code execution. This issue has been fixed in versions 24.10.6 and 25.12.1.

Fix

RCE

Stack Overflow

Weakness Enumeration

CWE-121

Related Identifiers

CVE-2026-30872

Affected Products

Openwrt

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-30872 · Security Note
• https://github.com/openwrt/openwrt/security/advisories/GHSA-mpgh-v658-jqv5 · Note
• https://github.com/openwrt/openwrt/releases/tag/v25.12.1 · Note
• https://github.com/openwrt/openwrt/releases/tag/v24.10.6 · Note
• https://twitter.com/0dayPublishing/status/2034754067033972825 · Twitter Post