PatchTheCVECVE-2026-56786: RTKLIB through 2.4.3 contains an out-of-bounds write vulnerability in decode_type1033 function that fails to c
CVE-2026-56786 is a critical-severity flaw (CVSS 9.8) affecting rtklib. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
RTKLIB through 2.4.3 contains an out-of-bounds write vulnerability in decode_type1033 function that fails to clamp length counters to destination buffer size, allowing up to 191-byte overflow into fixed 64-byte descriptor fields. An attacker controlling an NTRIP or serial RTCM3 correction stream can craft a valid CRC-bearing type-1033 message to corrupt adjacent rtcm_t object members, potentially achieving arbitrary code execution or denial of se
Why this priority
- Critical severity
- Public exploit reference
- CISA SSVC: automatable with total technical impact
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.7% (top 47%) |
| CISA exploited list | No |
| Weakness | CWE-787 |
| Published | 2026-06-25 |
| Last modified | 2026-10-25 |
Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Exact fixes by distribution
Public exploits and detection
Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-56786?
rtklib: upgrade to newer than 2.4.3. Exact commands for each OS are on this page.
Is CVE-2026-56786 being exploited?
CVE-2026-56786 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-56786 affect?
CVE-2026-56786 affects rtklib. Severity is critical (CVSS 9.8). RTKLIB through 2.4.3 contains an out-of-bounds write vulnerability in decode_type1033 function that fails to clamp length counters to destination buffer size, allowing up to 191-byte overflow into fixed 64-byte descriptor fields. An attacke
How urgent is CVE-2026-56786?
Priority 61/100. Critical severity; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action
Related CVEs
- CVE-2026-56787 MEDIUM 6.5 UPGRADE RTKLIB through 2.4.3 contains an off-by-one out-of-bounds read vulnerability in the decode_ssr3 function at sr
- CVE-2026-56789 MEDIUM 6.5 UPGRADE RTKLIB through 2.4.3 contains a heap buffer overflow vulnerability in the readrnxobsb function in src/rinex.c
- CVE-2026-56788 MEDIUM 4.4 UPGRADE RTKLIB through 2.4.3 contains an out-of-bounds read vulnerability in getcodepri function when processing unrec