CVE-2026-56787 RTKLIB 2.4.3 - Off-by-One Out-of-Bounds Read in decode_ssr3 via RTCM3 SSR Message
Remote attackers can cause denial of service in RTKLIB rovers and CORS servers by sending crafted RTCM3 SSR messages that trigger an out-of-bounds read.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-56787?
CVE-2026-56787 is a medium-severity memory corruption vulnerability in tomojitakasu RTKLIB, published on 25 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-193
Which versions are affected by CVE-2026-56787?
It affects 1 product.
Products include Rtklib Rtklib.
How do I fix CVE-2026-56787?
No fix has been published for CVE-2026-56787 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-56787 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-56787 exists.
Other vulnerabilities in tomojitakasu RTKLIB
Sources
Also known as DEBIAN-CVE-2026-56787, GHSA-8p7j-vhgr-rcw5, UBUNTU-CVE-2026-56787.