CVE-2026-18588
Remote stack buffer overflow in Wavlink WL-NU516U1 nas.cgi via CONTENT_LENGTH
Is CVE-2026-18588 being exploited?
Not confirmed. CVE-2026-18588 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.61% probability of exploitation in the next 30 days.
How severe is CVE-2026-18588?
CVE-2026-18588 is rated Critical with a CVSS score of 9.3. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-18588?
Yes. A fix has been recorded for CVE-2026-18588. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-18588 affect?
CVE-2026-18588 affects Wavlink WL-NU516U1 (firmware), Wavlink routers using nas.cgi/fgets. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-18588?
Update firmware to vendor-fixed version; disable remote admin and restrict management access.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote stack-based buffer overflow allows remote code execution or device crash via crafted CONTENT_LENGTH.
Immediate action required
- affected708c073-mt7628
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.