CVE-2026-56788

HIGHNVD 7.14.4▼
EchelonGraph scoreMEDIUM confidence

Score 4.4 from GitHub Security Advisory published 2026-06-25. NVD baseline CVSS 7.1; sources differ by 2.7.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this weekElevated
7.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.1Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

RTKLIB through 2.4.3 contains an out-of-bounds read vulnerability in getcodepri function when processing unrecognized RINEX observation codes, allowing attackers to trigger denial of service. Crafted RINEX files with unknown observation types cause negative array indexing into the codepris table, resulting in reliable crashes and potential memory disclosure of adjacent global data.

CVSS v3
7.1
EG Score
4.4(medium)
EPSS
2.1%
KEV
Not listed

Published

June 25, 2026

Last Modified

June 27, 2026

Advisory Details (2)

Auto-updated Jun 25, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

RTKLIB 2.4.3 - Out-of-bounds Read via Negative Array Index in getcodepri | Advisories | VulnCheck

https://www.vulncheck.com/advisories/rtklib-out-of-bounds-read-via-negative-array-index-in-getcodepri
generic🟡 PoC Available

Global-Buffer-Overflow in RTKLIB `getcodepri` via Unrecognized RINEX Observation Code · Issue #797 · tomojitakasu/RTKLIB · GitHub

https://github.com/tomojitakasu/RTKLIB/issues/797

Vendor Advisories for CVE-2026-56788(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 20× in last 7d / 38× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-07 07:31 UTCEG score recompute
  2. 2026-07-07 07:30 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-06 06:15 UTCEG score recompute
  6. 2026-07-06 06:15 UTCGHSA enrichment
  7. 2026-07-06 02:23 UTCEPSS rescore
  8. 2026-07-06 02:23 UTCEPSS rescore
  9. 2026-07-05 05:15 UTCEG score recompute
  10. 2026-07-05 05:15 UTCGHSA enrichment
  11. 2026-07-04 04:07 UTCEG score recompute
  12. 2026-07-04 04:07 UTCGHSA enrichment
  13. 2026-07-03 02:45 UTCEG score recompute
  14. 2026-07-03 02:45 UTCGHSA enrichment
  15. 2026-07-02 01:44 UTCEG score recompute
  16. 2026-07-02 01:44 UTCGHSA enrichment
  17. 2026-07-01 15:07 UTCEPSS rescore
  18. 2026-07-01 00:45 UTCEG score recompute
  19. 2026-07-01 00:45 UTCGHSA enrichment
  20. 2026-06-30 23:22 UTCEPSS rescore
  21. 2026-06-29 23:46 UTCEG score recompute
  22. 2026-06-29 23:46 UTCGHSA enrichment
  23. 2026-06-29 14:06 UTCEPSS rescore
  24. 2026-06-28 22:46 UTCEG score recompute
  25. 2026-06-28 22:46 UTCGHSA enrichment
Show 13 more
  1. 2026-06-28 14:07 UTCEPSS rescore
  2. 2026-06-28 04:56 UTCEPSS rescore
  3. 2026-06-28 04:56 UTCEPSS rescore
  4. 2026-06-27 21:47 UTCEG score recompute
  5. 2026-06-27 21:47 UTCGHSA enrichment
  6. 2026-06-27 05:08 UTCNVD updateCVSS v3 → 7.1 · severity → HIGH
  7. 2026-06-27 05:07 UTCMITRE cvelistV5CVSS v3 → 4.4 · severity → MEDIUM
  8. 2026-06-27 03:08 UTCEPSS rescore
  9. 2026-06-26 20:48 UTCEG score recompute
  10. 2026-06-26 20:48 UTCGHSA enrichment
  11. 2026-06-26 17:41 UTCNVD updateCVSS v3 → 7.1 · severity → HIGH
  12. 2026-06-25 19:49 UTCEG score recompute
  13. 2026-06-25 19:49 UTCNVD updatefirst tracked

Frequently asked(5)

What is CVE-2026-56788?
CVE-2026-56788 is a high vulnerability published on June 25, 2026. RTKLIB through 2.4.3 contains an out-of-bounds read vulnerability in getcodepri function when processing unrecognized RINEX observation codes, allowing attackers to trigger denial of service. Crafted RINEX files with unknown observation types cause negative array indexing into the codepris table,…
When was CVE-2026-56788 disclosed?
CVE-2026-56788 was first published in the National Vulnerability Database on June 25, 2026, with the most recent update on June 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56788 actively exploited?
CVE-2026-56788 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-56788?
CVE-2026-56788 has a CVSS v3 base score of 7.1 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 4.4.
How do I remediate CVE-2026-56788?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56788, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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