CVE-2026-56789: Heap-based Buffer Overflow in tomojitakasu RTKLIB
RTKLIB through 2.4.3 contains a heap buffer overflow vulnerability in the readrnxobsb function in src/rinex.c that allows attackers to trigger memory corruption by failing to clamp satellite count values from RINEX epoch headers. Attackers can craft malicious RINEX files declaring more than 64 satellites per epoch to cause heap buffer overflow writes and out-of-bounds stack reads, crashing RTKLIB-based applications including rnx2rtkp and RTKPOST.
AI Analysis
Technical Summary
CVE-2026-56789 is a heap buffer overflow vulnerability in RTKLIB through version 2.4.3, specifically in the readrnxobsb function in src/rinex.c. The vulnerability occurs because the software fails to clamp satellite count values from RINEX epoch headers, enabling attackers to craft malicious RINEX files that declare more than 64 satellites per epoch. This causes heap buffer overflow writes and out-of-bounds stack reads, resulting in memory corruption and application crashes in RTKLIB-based tools including rnx2rtkp and RTKPOST.
Potential Impact
Successful exploitation can cause memory corruption leading to application crashes in RTKLIB-based software. There is no indication of code execution or privilege escalation. The impact is denial of service through crashes triggered by maliciously crafted RINEX files.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround is currently documented. Users should monitor vendor communications for patches or updates addressing this vulnerability.
CVE-2026-56789: Heap-based Buffer Overflow in tomojitakasu RTKLIB
Description
RTKLIB through 2.4.3 contains a heap buffer overflow vulnerability in the readrnxobsb function in src/rinex.c that allows attackers to trigger memory corruption by failing to clamp satellite count values from RINEX epoch headers. Attackers can craft malicious RINEX files declaring more than 64 satellites per epoch to cause heap buffer overflow writes and out-of-bounds stack reads, crashing RTKLIB-based applications including rnx2rtkp and RTKPOST.
CVSS v4.0
Score 7.1high
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-56789 is a heap buffer overflow vulnerability in RTKLIB through version 2.4.3, specifically in the readrnxobsb function in src/rinex.c. The vulnerability occurs because the software fails to clamp satellite count values from RINEX epoch headers, enabling attackers to craft malicious RINEX files that declare more than 64 satellites per epoch. This causes heap buffer overflow writes and out-of-bounds stack reads, resulting in memory corruption and application crashes in RTKLIB-based tools including rnx2rtkp and RTKPOST.
Potential Impact
Successful exploitation can cause memory corruption leading to application crashes in RTKLIB-based software. There is no indication of code execution or privilege escalation. The impact is denial of service through crashes triggered by maliciously crafted RINEX files.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround is currently documented. Users should monitor vendor communications for patches or updates addressing this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-06-23T01:24:27.651Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a3d73fd4853345fc14dfac5
Added to database: 06/25/2026, 18:31:25 UTC
Last enriched: 06/25/2026, 18:45:58 UTC
Last updated: 06/25/2026, 19:01:11 UTC
Views: 3
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