Integer Underflow (Wrap or Wraparound) Affecting openwrt package, versions [,25.12.5)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published8 Jul 2026
- disclosed7 Jul 2026
- creditUnknown
Introduced: 7 Jul 2026
CVE-2026-55490 (opens in a new tab)How to fix?
Upgrade openwrt to version 25.12.5 or higher.
Overview
Affected versions of this package are vulnerable to Integer Underflow (Wrap or Wraparound) via the handle_send_a function. An attacker can cause the Emergency Access Daemon to crash by sending a single crafted UDP packet that triggers an integer underflow before a bounds check, resulting in a large value being passed to memcpy.