CVE-2026-56789

7.1 highEPSS 0.4%

RTKLIB through 2.4.3 contains a heap buffer overflow vulnerability in the readrnxobsb function in src/rinex.c that allows attackers to trigger memory corruption by failing to clamp satellite count values from RINEX epoch headers. Attackers can craft malicious RINEX files declaring more than 64 satellites per epoch to cause heap buffer overflow writes and out-of-bounds stack reads, crashing RTKLIB-based applications including rnx2rtkp and RTKPOST.

CVSS 4.0: 7.1CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS 3.1: 6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
EPSS: 0.4% chance of exploitation in the next 30 days; higher than 36% of CVEs (scores of 2026-10-25)
CWE: CWE-122
Published: 2026-06-25
Modified: 2026-10-25
Record from: the NVD, synced 2026-10-25

Affected

rtklib:rtklib

References

https://github.com/tomojitakasu/RTKLIB/issues/796
https://www.vulncheck.com/advisories/rtklib-heap-buffer-overflow-and-stack-read-via-oversized-rinex-epoch-satellite-count

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