CVE-2026-56787: Off-by-one Error in tomojitakasu RTKLIB
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.
AI Analysis
Technical Summary
CVE-2026-56787 is an off-by-one out-of-bounds read vulnerability in the decode_ssr3 function of RTKLIB through version 2.4.3. The vulnerability arises from improper bounds checking when processing RTCM3 SSR messages, specifically in the handling of signal mode fields. Remote attackers can exploit this by sending malicious SSR correction streams over NTRIP or serial connections, triggering a global buffer overflow that results in denial of service or application crashes. No official patch or remediation has been confirmed as of the published date.
Potential Impact
Successful exploitation allows remote attackers to cause a denial of service or crash RTKLIB rovers and CORS servers by triggering a global buffer overflow via crafted RTCM3 SSR messages. There is no indication of privilege escalation or data disclosure in the provided information.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, consider restricting or validating incoming SSR correction streams from untrusted sources to reduce exposure.
CVE-2026-56787: Off-by-one Error in tomojitakasu RTKLIB
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.
CVSS v4.0
Score 6.9medium
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-56787 is an off-by-one out-of-bounds read vulnerability in the decode_ssr3 function of RTKLIB through version 2.4.3. The vulnerability arises from improper bounds checking when processing RTCM3 SSR messages, specifically in the handling of signal mode fields. Remote attackers can exploit this by sending malicious SSR correction streams over NTRIP or serial connections, triggering a global buffer overflow that results in denial of service or application crashes. No official patch or remediation has been confirmed as of the published date.
Potential Impact
Successful exploitation allows remote attackers to cause a denial of service or crash RTKLIB rovers and CORS servers by triggering a global buffer overflow via crafted RTCM3 SSR messages. There is no indication of privilege escalation or data disclosure in the provided information.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, consider restricting or validating incoming SSR correction streams from untrusted sources to reduce exposure.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-06-23T01:24:27.651Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a3d73fd4853345fc14dfaba
Added to database: 06/25/2026, 18:31:25 UTC
Last enriched: 07/15/2026, 10:17:57 UTC
Last updated: 08/08/2026, 12:41:11 UTC
Views: 59
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