PatchTheCVECVE-2026-20494: In wifi, there is a possible out of bounds read due to a missing bounds check
CVE-2026-20494 is a medium-severity flaw (CVSS 5.5) affecting mt6890 firmware, mt6988 firmware, mt6990 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
In wifi, there is a possible out of bounds read due to a missing bounds check. This could lead to local information disclosure if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS10960006 / BORA00155314, BORA00155001, BORA00154907; Issue ID: MSV-7570.
Why this priority
- No elevated risk signals yet
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 5.5 (Medium) |
| Attack vector | Local |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | None |
| EPSS exploit chance | 0.1% (top 97%) |
| CISA exploited list | No |
| Weakness | CWE-125 |
| Published | 2026-08-03 |
| Last modified | 2026-10-23 |
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-20494?
mt6890 firmware: mitigate or apply the listed mitigation; mt6988 firmware: mitigate or apply the listed mitigation; mt6990 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2026-20494 being exploited?
CVE-2026-20494 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-20494 affect?
CVE-2026-20494 affects mt6890 firmware, mt6988 firmware, mt6990 firmware. Severity is medium (CVSS 5.5). In wifi, there is a possible out of bounds read due to a missing bounds check. This could lead to local information disclosure if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation.
How urgent is CVE-2026-20494?
Priority 20/100. No elevated risk signals yet.
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