CVE-2026-55490
Last modified
CVE-2026-55490 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. OpenWrt is a Linux operating system targeting embedded devices. Before v25.12.5, an integer underflow in handle_send_a() of the Emergency Access Daemon allows any unauthenticated attacker on the local network to crash the daemon by sending a single crafted UDP packet. EPSS estimates a 0.65% chance of exploitation in the next 30 days.
Description
OpenWrt is a Linux operating system targeting embedded devices. Before v25.12.5, an integer underflow in handle_send_a() of the Emergency Access Daemon allows any unauthenticated attacker on the local network to crash the daemon by sending a single crafted UDP packet. The message length underflows before a bounds check and is then passed to memcpy as a very large size. This issue is fixed v25.12.5.
Metrics
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Openwrt | Openwrt | < 25.12.5 |
References
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-55490?
How severe is CVE-2026-55490?
How do I fix CVE-2026-55490?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-55479Snipe-IT is an IT asset/license management system. Prior to …4.3
- CVE-2026-5548A vulnerability was found in Tenda AC10 16.03.10.10_multi_TD…8.8
- CVE-2026-55481Snipe-IT is an IT asset/license management system. Prior to …4.8
- CVE-2026-55487pnpm is a package manager. Prior to 10.34.2 and 11.5.3, the …8.8
- CVE-2026-55488motionEye (mEye) is an online interface for a piece of softw…7.7
- CVE-2026-5549A vulnerability was determined in Tenda AC10 16.03.10.10_mul…7.5
- CVE-2026-55495Cloudreve is a self-hosted file management and sharing syste…4.3
- CVE-2026-55496Cloudreve is a self-hosted file management and sharing syste…4.3
- CVE-2026-55497Cloudreve is a self-hosted file management and sharing syste…6.5
- CVE-2026-55499Cloudreve is a self-hosted file management and sharing syste…4.3
- CVE-2026-5550A vulnerability was identified in Tenda AC10 16.03.10.10_mul…8.8
- CVE-2026-555009Router is an AI router & token saver. Prior to 0.4.80, the …9.9
Are you affected by CVE-2026-55490?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST