CVE-2026-56787

MEDIUM

RTKLIB 2.4.3 - Off-by-One Out-of-Bounds Read in decode_ssr3 via RTCM3 SSR Message

Title source: cna
STIX 2.1

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.

References (2)

Core 2
Core References
Exploit technical-description exploit
Researcher Disclosure
https://github.com/tomojitakasu/RTKLIB/issues/798

Scores

CVSS v3 6.5
EPSS 0.0034
EPSS Percentile 26.1%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact partial

Details

CWE
CWE-193
Status published
Products (2)
rtklib/rtklib < 2.4.3
tomojitakasu/RTKLIB < 2.4.3
Published Jun 25, 2026
Tracked Since Jun 26, 2026