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CVE detail

CVE-2026-26197

HDF5 is a high-performance library and a file format specification that implements the HDF5 data model. If a file is corrupted such that an array datatype's size, the number of elements, and the element size are not in agreement it can trigger an out of bounds read. The array datatype stores the full size of the datatype (`dt->shared->size`) separately from the number of elements (`dt->shared->u.array.nelem`) and the element size (`dt->shared->parent->shared->size`). If any one of these are corrupted so that they don't align with the others (element size * nelem = full size), it can lead to an out of bounds read. Depending on what is corrupted, it can alter the type of out of bounds read triggered. The vulnerability is present only in files that have been maliciously altered, as its generally not possible to independently alter the full size of the datatype, the element count and the element size. As such, this is only present if a malicious actor is altering files, and won't appear in regular usage.

CVSS 5.9 · MediumBuzz score 21.0

Buzz score

Why this CVE is surfacing

Buzz score total 21.0

This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.

Buzz score components · mention 11.0 · diversity 10.0 · KEV 0.0 · OTX 0.0 · PoC 0.0
Mention score
11.0
2 evidence mentions in the snapshot
Diversity score
10.0
2 sources across 2 categories
KEV score
0.0
No KEV entry observed
OTX score
0.0
0 OTX pulses
PoC score
0.0
0 repos · best confidence N/A
Best PoC traction
0
Maximum stars on a matched PoC repo

Why it matters now

Mention timeline

Total mentions
2
within the 30d window
Peak daily
1
highest bucket

Evidence

Source links by recency

Newest mentions first
2 source links · newest first

Exploit code

Public exploit repository references

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0 repository references · best confidence N/A · max 0 stars
No public PoC repositories have been matched yet.

Related records

Similar CVEs

6 related CVEs with shared weakness or product evidence
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    HDF5 Library through 1.14.3 contains a out-of-bounds read operation in H5FL_arr_malloc in H5FL.c (called from H5S_set_extent_simple in H5S.c).

    CVSS 9.1 · Critical
  • CVE-2024-32614

    HDF5 Library through 1.14.3 has a SEGV in H5VM_memcpyvv in H5VM.c.

    CVSS 8.8 · High
  • CVE-2024-32607

    HDF5 Library through 1.14.3 has a SEGV in H5A__close in H5Aint.c, resulting in the corruption of the instruction pointer.

    CVSS 5.7 · Medium
  • CVE-2022-25942

    An out-of-bounds read vulnerability exists in the gif2h5 functionality of HDF5 Group libhdf5 1.10.4. A specially-crafted GIF file can lead to code execution. An attacker can provi…

    CVSS 7.8 · High
  • CVE-2020-10811

    An issue was discovered in HDF5 through 1.12.0. A heap-based buffer over-read exists in the function H5O__layout_decode() located in H5Olayout.c. It allows an attacker to cause De…

    CVSS 5.5 · Medium
  • CVE-2019-9152

    An issue was discovered in the HDF HDF5 1.10.4 library. There is an out of bounds read in the function H5MM_xstrdup in H5MM.c when called from H5O_dtype_decode_helper in H5Odtype.…

    CVSS 8.8 · High