8.5

CVE-2026-106547: HDF5 heap buffer overflow in H5VM_array_fill via crafted fill-value metadata

Awaiting analysis
AliasesUBUNTU-CVE-2026-106547DEBIAN-CVE-2026-106547
Published 06-10-2026Last modified 07-10-2026

Vulnerability summary

CVE-2026-106547 is a high (CVSS 8.5) Heap-based Buffer Overflow vulnerability in the hdf group hdf5. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 5.4% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 8.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
8.5/10
010
High · v4.0 (CVE.org)
EPSS score
0.16%
0%100%
Low · Change unavailable
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1
RHSA-2026:73539

Timeline

  1. 06-10-2026
    PublishedVulnerability first disclosed.
  2. 07-10-2026
    Last modifiedVulnerability information updated.

Description

A heap-based buffer overflow in H5VM_array_fill() in src/H5VM.c in HDF5 before 2.2.0 lets a remote attacker cause an application crash and possibly execute arbitrary code with a crafted HDF5 file. When a dataset's unallocated chunks are read, H5D__fill_init() fills the fill-value buffer from datatype and dataspace metadata in the file. If that metadata is inconsistent with the buffer's allocated size, the write goes past the end of the buffer. The attacker can control the content written through the fill value stored in the file.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.16%

Chance of exploitation in the next 30 days

Percentile

5%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

07-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, no authentication, user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu2 products
  • hdf5All versions (No fix recorded)
  • r-bioc-rhdf5libAll versions (No fix recorded)
Debian1 product
  • hdf5All versions (No fix recorded)
The hdf group1 product
  • hdf5≥ 1.10.0, < 2.2.0

3 vendors · 4 products

References

4 links