CVE-2026-56788

Name: CVE-2026-56788
Creator: NVD / NIST
Published: 2026-06-25T19:16:45.33+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.8/10EPSS 0.11%

Last modified Jun 27, 2026

CVE-2026-56788 is a medium-severity vulnerability rated 4.8/10 on the CVSS scale. 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.. EPSS estimates a 0.11% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

7.1/10

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

CVSS 4.0

4.8/10

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.11%

1.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Rtklib	Rtklib	<= 2.4.3

References

https://github.com/tomojitakasu/RTKLIB/issues/797Exploit, Issue Tracking, Third Party Advisory
https://www.vulncheck.com/advisories/rtklib-out-of-bounds-read-via-negative-array-index-in-getcodepriThird Party Advisory
https://github.com/tomojitakasu/RTKLIB/issues/797Exploit, Issue Tracking, Third Party Advisory

Timeline

Published: Jun 25, 2026
Last Modified: Jun 27, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2026-56788?

How severe is CVE-2026-56788?

CVE-2026-56788 has a CVSS score of 4.8/10 (MEDIUM severity). The EPSS model estimates a 0.11% probability of exploitation in the next 30 days.

How do I fix CVE-2026-56788?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-56788?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST