CVE-2026-56786 | THREATINT

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.

PUBLISHED Reserved 2026-06-23 | Published 2026-06-25 | Updated 2026-06-25 | Assigner VulnCheck

CRITICAL: 9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CRITICAL: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Problem types

Out-of-bounds Write

Product status

Default status

unaffected

Any version

affected

Credits

FuzzingLabs finder

References

github.com/tomojitakasu/RTKLIB/issues/799 (Researcher Disclosure) technical-description exploit

www.vulncheck.com/...code-type1033-via-crafted-rtcm3-message third-party-advisory

cve.org (CVE-2026-56786)

nvd.nist.gov (CVE-2026-56786)

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