How severe is CVE-2026-56789?

CVE-2026-56789 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-56789 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-56789?

CVE-2026-56789 affects Rtklib. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-56789?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-56789 have an EU (EUVD) identifier?

Yes. CVE-2026-56789 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39531.

When was CVE-2026-56789 published?

CVE-2026-56789 was published on 2026-06-25 and last updated on 2026-06-26.

CVE-2026-56789

CVE-2026-56789 is a medium-severity vulnerability in Rtklib with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-122.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v4: 7.1
EPSS exploit prediction: 0% (15th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-39531
Weakness: CWE-122
Affected product: Rtklib
Published: 2026-06-25
Last modified: 2026-06-26

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.

Frequently asked questions

What is CVE-2026-56789?: 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.
How severe is CVE-2026-56789?: CVE-2026-56789 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-56789 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-56789?: CVE-2026-56789 affects Rtklib. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-56789?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-56789 have an EU (EUVD) identifier?: Yes. CVE-2026-56789 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39531.
When was CVE-2026-56789 published?: CVE-2026-56789 was published on 2026-06-25 and last updated on 2026-06-26.

References

Affected products (1)

cpe:2.3:a:rtklib:rtklib:*:*:*:*:*:*:*:*

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