CVE-2026-56786
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk34th percentile - higher than 34% of all known CVEs
Summary
RTKLIB through version 2.4.3 contains an out-of-bounds write vulnerability in the decode_type1033 function that fails to clamp length counters to the 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.
Risk Assessment
The risk for the organization includes potential remote code execution or service disruption in systems using RTKLIB to process RTCM3 correction streams, which could compromise the integrity and availability of navigation services.
Recommendation
It is recommended to immediately upgrade RTKLIB to a version newer than 2.4.3 if available, or apply temporary mitigations such as filtering and validating RTCM3 streams before processing.
Other vulnerabilities in RTKLIB
See all- CVE-2026-56789Medium
RTKLIB through version 2.4.3 has a heap buffer overflow vulnerability in the readrnxobsb function in src/rinex.c. Attackers can craft malicious RINEX files declaring more than 64 satellites per epoch, causing heap buffer overflow writes and out-of-bounds stack reads, crashing RTKLIB-based applications like rnx2rtkp and RTKPOST.
- CVE-2026-56788Medium
RTKLIB through version 2.4.3 contains an out-of-bounds read vulnerability in the getcodepri function when processing unrecognized RINEX observation codes. Crafted RINEX files with unknown observation types cause negative array indexing into the codepris table, leading to reliable crashes and potential memory disclosure of adjacent global data.
- CVE-2026-56787Medium
RTKLIB through version 2.4.3 contains an off-by-one out-of-bounds read vulnerability in the decode_ssr3 function at src/rtcm3.c:1446. Remote attackers can exploit this by sending crafted RTCM3 SSR messages with attacker-controlled signal mode fields, leading to a global buffer overflow.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS