Bug 2493115 (CVE-2026-56787)

Summary: CVE-2026-56787 RTKLIB: RTKLIB: Denial of Service via crafted RTCM3 SSR messages
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in RTKLIB. A remote attacker can exploit an off-by-one out-of-bounds read vulnerability, leading to a global buffer overflow, by sending malicious SSR correction streams over NTRIP or serial connections. This can cause a denial of service or crash affected RTKLIB rovers and CORS servers.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2494494, 2494495    
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Description OSIDB Bzimport 2026-06-25 19:02:56 UTC
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.