Is CVE-2026-56788 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-56788 being exploited in the wild.

How severe is CVE-2026-56788?

Medium severity, with a CVSS score of 4.4, published 25 June 2026.

Which products and versions are affected?

Tomoji Takasu RTKLIB through 2.4.3.

Is there a fix for CVE-2026-56788?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-56788 attacked?

It is attacked with local access, in a software library.

Am I affected by CVE-2026-56788?

Check whether you run Tomoji Takasu RTKLIB at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-56788: RTKLIB out-of-bounds read in getcodepri function

CVE-2026-56788 · Severity: medium · CVSS 4.4 · Published 2026-06-25

RTKLIB is an open-source program package for standard and precise positioning with GNSS (Global Navigation Satellite System). A vulnerability in how the software handles specific satellite data files (RINEX) could allow an attacker to crash the application or potentially view sensitive internal memory. To exploit this, an attacker would need to convince a user to process a specially crafted, malicious RINEX data file.

Technologies: Tomoji Takasu RTKLIB. Vendors: Tomoji Takasu.

Quick answers

Is CVE-2026-56788 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-56788 being exploited in the wild.
How severe is CVE-2026-56788?: Medium severity, with a CVSS score of 4.4, published 25 June 2026.
Which products and versions are affected?: Tomoji Takasu RTKLIB through 2.4.3.
Is there a fix for CVE-2026-56788?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-56788 attacked?: It is attacked with local access, in a software library.
Am I affected by CVE-2026-56788?: Check whether you run Tomoji Takasu RTKLIB at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An out-of-bounds read exists in the `getcodepri` function within `src/rtkcmn.c`. When the software encounters an unrecognized RINEX observation code, the `code2obs` function returns an empty string and sets an index variable to zero. Subsequent logic performs a negative array index operation (`j-1`) and attempts to read one byte past the empty string constant. This results in a reliable crash (Denial of Service) and may allow the disclosure of adjacent global data. The vulnerability is triggered when a user processes a crafted RINEX file containing unknown observation types.

Affected products

tomojitakasu RTKLIB through 2.4.3

Timeline

2026-06-09: disclosed: Issue reported on GitHub by FuzzingLabs
2026-06-25: advisory: NVD and VulnCheck published advisory details

References

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