PT-2026-26380 · Openwrt · Openwrt

Axelm-Tob · Published 2026-03-19 · Updated 2026-03-19 · CVE-2026-30871

Mitre

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

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 parse question function. The issue is triggered by PTR queries for reverse DNS domains (.in-addr.arpa and .ip6.arpa). DNS packets received on UDP port 5353 are expanded by dn expand into an 8096-byte global buffer (name buffer), which is then copied via an unbounded strcpy into a fixed 256-byte stack buffer when handling TYPE PTR queries. The overflow is possible because dn expand converts non-printable ASCII bytes (e.g., 0x01) into multi-character octal representations (e.g., 001), significantly inflating the expanded name beyond the stack buffer's capacity. A crafted DNS packet can exploit this expansion behavior to overflow the stack buffer, making the vulnerability reachable through normal multicast DNS packet processing. This issue has been fixed in versions 24.10.6 and 25.12.1.

Fix

Stack Overflow

Weakness Enumeration

CWE-121

Related Identifiers

CVE-2026-30871

Affected Products

Openwrt

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-30871 · Security Note
• https://github.com/openwrt/openwrt/releases/tag/v24.10.6 · Note
• https://github.com/openwrt/openwrt/releases/tag/v25.12.1 · Note
• https://github.com/openwrt/openwrt/security/advisories/GHSA-7c3j-f7w2-p8f6 · Note