Vulnerability Description
RTKLIB through 2.4.3 contains an out-of-bounds write vulnerability in decode_type1033 function that fails to clamp length counters to destination buffer size, allowing up to 191-byte overflow into fixed 64-byte descriptor fields. An attacker controlling an NTRIP or serial RTCM3 correction stream can craft a valid CRC-bearing type-1033 message to corrupt adjacent rtcm_t object members, potentially achieving arbitrary code execution or denial of service.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Rtklib | Rtklib | <= 2.4.3 |
Related Weaknesses (CWE)
References
- https://github.com/tomojitakasu/RTKLIB/issues/799ExploitIssue TrackingThird Party Advisory
- https://www.vulncheck.com/advisories/rtklib-out-of-bounds-write-in-decode-type10Third Party Advisory
FAQ
What is CVE-2026-56786?
CVE-2026-56786 is a vulnerability with a CVSS score of 9.8 (CRITICAL). RTKLIB through 2.4.3 contains an out-of-bounds write vulnerability in decode_type1033 function that fails to clamp length counters to destination buffer size, allowing up to 191-byte overflow into fix...
How severe is CVE-2026-56786?
CVE-2026-56786 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-56786?
Check the references section above for vendor advisories and patch information. Affected products include: Rtklib Rtklib.