Is CVE-2026-56787 actively exploited?

No active exploitation of CVE-2026-56787 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-56787 be exploited remotely?

Yes. CVE-2026-56787 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-56787?

CVE-2026-56787 has a CVSS score of 7.5 (HIGH).

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HIGH

CVE-2026-56787

CWE-193Published: June 25, 2026· Updated: Jun 26, 2026

7.5

CVSS v3.1

EPSS:0.33%probability of exploitation in 30 daysPercentile:24.3th

Official 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.

NVD Source

Technical Analysis

CVE-2026-56787 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.