Vulnerability Description
RTKLIB through 2.4.3 contains an off-by-one out-of-bounds read vulnerability in the decode_ssr3 function at src/rtcm3.c:1446 that allows remote attackers to trigger a global buffer overflow via crafted RTCM3 SSR messages with attacker-controlled signal mode fields. Remote attackers can exploit this vulnerability by sending malicious SSR correction streams over NTRIP or serial connections to cause denial of service or crash RTKLIB rovers and CORS servers.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Rtklib | Rtklib | <= 2.4.3 |
Related Weaknesses (CWE)
References
- https://github.com/tomojitakasu/RTKLIB/issues/798ExploitIssue TrackingThird Party Advisory
- https://www.vulncheck.com/advisories/rtklib-off-by-one-out-of-bounds-read-in-decThird Party Advisory
FAQ
What is CVE-2026-56787?
CVE-2026-56787 is a vulnerability with a CVSS score of 6.5 (MEDIUM). RTKLIB through 2.4.3 contains an off-by-one out-of-bounds read vulnerability in the decode_ssr3 function at src/rtcm3.c:1446 that allows remote attackers to trigger a global buffer overflow via crafte...
How severe is CVE-2026-56787?
CVE-2026-56787 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-56787?
Check the references section above for vendor advisories and patch information. Affected products include: Rtklib Rtklib.