CVE-2026-55490

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Source

https://cve.org/CVERecord?id=CVE-2026-55490

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55490.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-55490

Aliases

GHSA-9558-77jp-g3fw

Published

2026-07-07T21:08:26Z

Modified

2026-08-12T03:51:21Z

Severity

6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator

Summary

OpenWrt: EAD Integer Underflow → Pre-Auth Denial of Service

Details

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.

Database specific

{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-191"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55490.json"
}

References

Affected packages

Git / github.com/openwrt/openwrt

Affected ranges

Type

GIT

Repo

https://github.com/openwrt/openwrt

Events

Introduced

Fixed

f0a60eee2fe051741c643ea6118718aae1ef17fb

Database specific

Show details

{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "25.12.5"
        }
    ],
    "source": "AFFECTED_FIELD"
}

Affected versions

Other

reboot

v25.*

v25.12.0

v25.12.0-rc1

v25.12.0-rc2

v25.12.0-rc3

v25.12.0-rc4

v25.12.0-rc5

v25.12.1

v25.12.2

v25.12.3

v25.12.4

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55490.json"