CVE-2026-56786

CVSS 9.8 · CRITICAL
EPSS p0
Lower risk — in the top 100% least-likely-to-be-exploited CVEs.
No patch reference
No patch/mitigation in references

Published 6/25/2026 · updated 6/25/2026 · CWE-787

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Summary

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 service.

CVSS 9.8CRITICAL

9.8 / 10
  • AV: Network
  • AC: Low complexity
  • PR: No privileges
  • UI: No user interaction
  • S: Scope unchanged
  • C: Confidentiality: High
  • I: Integrity: High
  • A: Availability: High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS exploitation probability

0.0%

Percentile p0 Lower risk — in the top 100% least-likely-to-be-exploited CVEs.

Timeline

  1. Jun 25, 2026 · Disclosed / published in NVD
  2. Jun 25, 2026 · Intel last updated

Intel sources

Which upstream feeds returned data for this CVE, and when they were last fetched.

  • NVD· 38 days ago
  • CVE.org· 29 days ago
  • FIRST EPSS· 38 days ago
  • CISA KEV· no data
  • OSV· 38 days ago

References

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