How severe is CVE-2026-29043?

CVE-2026-29043 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-29043 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-29043?

CVE-2026-29043 affects Hdfgroup Hdf5. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-29043?

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

Does CVE-2026-29043 have an EU (EUVD) identifier?

Yes. CVE-2026-29043 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21406.

When was CVE-2026-29043 published?

CVE-2026-29043 was published on 2026-04-10 and last updated on 2026-06-17.

CVE-2026-29043

CVE-2026-29043 is a medium-severity vulnerability in Hdfgroup Hdf5 with a CVSS 3.x base score of 5.5. 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 5.5)
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-21406
Weakness: CWE-122
Affected product: Hdfgroup Hdf5
Published: 2026-04-10
Last modified: 2026-06-17

Description

HDF5 is software for managing data. In 1.14.1-2 and earlier, an attacker who can control an h5 file parsed by HDF5 can trigger a write-based heap buffer overflow condition in the H5T__ref_mem_setnull method. This can lead to a denial-of-service condition, and potentially further issues such as remote code execution depending on the practical exploitability of the heap overflow against modern operating systems.

Frequently asked questions

What is CVE-2026-29043?: HDF5 is software for managing data. In 1.14.1-2 and earlier, an attacker who can control an h5 file parsed by HDF5 can trigger a write-based heap buffer overflow condition in the H5T__ref_mem_setnull method. This can lead to a denial-of-service condition, and potentially further issues such as remote code execution depending on the practical exploitability of the heap overflow against modern operating systems.
How severe is CVE-2026-29043?: CVE-2026-29043 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-29043 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-29043?: CVE-2026-29043 affects Hdfgroup Hdf5. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-29043?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-29043 have an EU (EUVD) identifier?: Yes. CVE-2026-29043 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21406.
When was CVE-2026-29043 published?: CVE-2026-29043 was published on 2026-04-10 and last updated on 2026-06-17.

References

https://github.com/HDFGroup/hdf5/security/advisories/GHSA-qm2m-5g5w-2277

Affected products (1)

cpe:2.3:a:hdfgroup:hdf5:*:*:*:*:*:*:*:*

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