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CVE-2026-56789— RTKLIB 2.4.3 - Heap Buffer Overflow and Stack Read via Oversized RINEX Epoch Satellite Count

Quick assessment

Affected
tomojitakasu RTKLIB
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Tomoji Takasu RTKLIB是日本Tomoji Takasu个人开发者的一个全球导航卫星系统标准与精确定位算法软件包。 Tomoji Takasu RTKLIB 2.4.3及之前版本存在缓冲区错误漏洞，该漏洞源于src/rinex.c文件中的readrnxobsb函数未对RINEX epoch标头中的卫星计数值进行限制，可能导致攻击者触发堆缓冲区溢出写入和越界栈读取，从而导致基于RTKLIB的应用程序崩溃。

CVSS 6.5 · Medium EPSS 0.42% · P35

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
tomojitakasu RTKLIB ≤ 2.4.3 affected
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I. Basic Information for CVE-2026-56789

Vulnerability Information
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Vulnerability Title
RTKLIB 2.4.3 - Heap Buffer Overflow and Stack Read via Oversized RINEX Epoch Satellite Count
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
Tomoji Takasu RTKLIB 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Tomoji Takasu RTKLIB是日本Tomoji Takasu个人开发者的一个全球导航卫星系统标准与精确定位算法软件包。 Tomoji Takasu RTKLIB 2.4.3及之前版本存在缓冲区错误漏洞，该漏洞源于src/rinex.c文件中的readrnxobsb函数未对RINEX epoch标头中的卫星计数值进行限制，可能导致攻击者触发堆缓冲区溢出写入和越界栈读取，从而导致基于RTKLIB的应用程序崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
tomojitakasu RTKLIB 0 ~ 2.4.3 -

II. Public POCs for CVE-2026-56789

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III. Intelligence Information for CVE-2026-56789

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Proof of Concept for CVE-2026-56789 (1)

Other References for CVE-2026-56789 (1)

Same Patch Batch · tomojitakasu · 2026-06-25 · 4 CVEs total

CVE-2026-56786 9.8 CRITICAL RTKLIB 2.4.3 - Out-of-bounds Write in decode_type1033 via Crafted RTCM3 Message
CVE-2026-56787 6.5 MEDIUM RTKLIB 2.4.3 - Off-by-One Out-of-Bounds Read in decode_ssr3 via RTCM3 SSR Message
CVE-2026-56788 4.4 MEDIUM RTKLIB 2.4.3 - Out-of-bounds Read via Negative Array Index in getcodepri

IV. Related Vulnerabilities

Same product: RTKLIB
Same vendor: tomojitakasu
Same weakness: CWE-122

V. Comments for CVE-2026-56789

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