Out-of-Bounds Read Vulnerability in RTKLIB by Tomoji Takasu
CVE-2026-56788

4.8MEDIUM

Key Information:

Vendor

Tomojitakasu

Status
Rtklib
Vendor
CVE Published:
25 June 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-56788?

RTKLIB versions up to 2.4.3 have a vulnerability in the getcodepri function that can be exploited when handling unrecognized RINEX observation codes. Attackers can craft RINEX files with unknown observation types to manipulate the processing, prompting negative array indexing into the codepris table. This exploitation can lead to application crashes and may expose adjacent global data in memory, facilitating further attacks.

Affected Version(s)

RTKLIB 0 <= 2.4.3

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-56788 - Proof of Concept

References

https://github.com/tomojitakasu/RTKLIB/issues/797
technical-descriptionexploit
https://www.vulncheck.com/advisories/rtklib-out-of-bounds...
third-party-advisory

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

FuzzingLabs
.