RTKLIB 2.4.3 - Out-of-bounds Read via Negative Array Index in getcodepri
Priority MEDIUM 55CWE-125Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- Passive
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- Low · None · Low
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00173 6th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA and NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| tomojitakasu | RTKLIB | up to 2.4.3 | — | No fix listed | CNA |
- RTKLIB Vendortomojitakasu Affected up to 2.4.3 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:rtklib:rtklib:*:*:*:*:*:*:*:* | up to 2.4.3 | Vulnerable | tomojitakasu |
- cpe:2.3:a:rtklib:rtklib:*:*:*:*:*:*:*:* Versions up to 2.4.3 Vulnerable ·tomojitakasu
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2026-56788
- 2026-10-03 Alias added: GHSA-m65p-fp8q-q43h
References
Exploit 1
More tomojitakasu Rtklib vulnerabilities
- TI-2026-40950 RTKLIB 2.4.3 - Out-of-bounds Write in decode_type1033 via Crafted RTCM3 Message CVSS 4.0CRITICAL 9.3
- TI-2026-40951 RTKLIB 2.4.3 - Off-by-One Out-of-Bounds Read in decode_ssr3 via RTCM3 SSR Message CVSS 4.0MEDIUM 6.9
- TI-2026-40953 RTKLIB 2.4.3 - Heap Buffer Overflow and Stack Read via Oversized RINEX Epoch Satellite Count CVSS 4.0HIGH 7.1
Sources
- CVE-2026-56788 · CVE Program
- CVE-2026-56788 · NVD
- FIRST EPSS
- GHSA-m65p-fp8q-q43h · GitHub Advisory Database · CC BY 4.0
- CVE-2026-56788 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences