CVE-2026-56789Public exploitNetwork attack vector

Application crash via oversized RINEX satellite count

Published Jun 25, 2026 · Updated Jun 25, 2026

Heap buffer overflow in RTKLIB 2.4.3 and earlier allows attackers to crash applications through a crafted RINEX observation file. In src/rinex.c, decode_obsepoch returns an unclamped per-epoch satellite count, and readrnxobsb indexes data and sats before its MAXOBS guard takes effect. Processing a file that declares more than 64 satellites is required and produces out-of-bounds heap writes and stack reads, causing a reliable service interruption.

CVSS severity7.1
High
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in RTKLIB 2.4.3 and earlier allows attackers to crash applications through a crafted RINEX observation file. In src/rinex.c, decode_obsepoch returns an unclamped per-epoch satellite count, and readrnxobsb indexes data and sats before its MAXOBS guard takes effect. Processing a file that declares more than 64 satellites is required and produces out-of-bounds heap writes and stack reads, causing a reliable service interruption.

The record

CVE
CVE-2026-56789
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
Tomoji Takasu
Product
RTKLIB
Classifications
CWE-122, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=2.4.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Tomoji Takasu · RTKLIBversion=0 <=2.4.3

Published CVSS scores

7.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
6.5UbuntuCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
T1204.002User Execution: Malicious File

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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