What’s Vulnerable › Vulnerabilities

CVE-2025-62526: OpenWrt ubusd vulnerable to heap buffer overflow

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-22 · updated 2026-10-19
• Weakness: CWE-122

Description

OpenWrt Project is a Linux operating system targeting embedded devices. Prior to version 24.10.4, ubusd contains a heap buffer overflow in the event registration parsing code. This allows an attacker to modify the head and potentially execute arbitrary code in the context of the ubus daemon. The affected code is executed before running the ACL checks, all ubus clients are able to send such messages. In addition to the heap corruption, the crafted subscription also results in a bypass of the listen ACL. This is fixed in OpenWrt 24.10.4. There are no workarounds.

Affected products

• openwrt: before 24.10.4 — fixed in 24.10.4

How to fix

Upgrade to a fixed version: openwrt 24.10.4. Check the vendor advisory for mitigations.

References

• https://github.com/openwrt/openwrt/commit/4b907e69ea58fc0ba35fd1755dc4ba22262af3a4
• https://github.com/openwrt/openwrt/commit/a7901969932a175cded3c93bdeb65f32ed3705e6
• https://github.com/openwrt/openwrt/security/advisories/GHSA-cp32-65v4-cp73
• https://github.com/openwrt/ubus/commit/60e04048a0e2f3e33651c19e62861b41be4c290f
• https://github.com/openwrt/ubus/commit/aa4a7ee1d3417bc11207ad0a78d579ece7fe0c13
• https://github.com/openwrt/ubus/commit/d31effb4277bd557f5ccf16d909422718c1e49d0
• https://openwrt.org/advisory/2025-10-22-1

Get alerted when CVE-2025-62526 or the next vulnerability affects your stack