---
id: CVE-2026-92627
title: "A heap-use-after-free vulnerability exists in H5T__conv_f_f() in src/H5Tconv.c in HDF5 before 1.14.2.\_When converting a compound datatype containing floating-point members during a dataset read, a temporary buffer allocated with calloc()…"
summary: "A heap-use-after-free vulnerability exists in H5T__conv_f_f() in src/H5Tconv.c in HDF5 before 1.14.2.\_When converting a compound datatype containing floating-point members during a dataset read, a temporary buffer allocated with calloc()…"
severity: medium
cvss: 4.6
cvssVector: 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N'
cwe:
  - CWE-416
  - CWE-825
vendor: The HDF Group
product: HDF5
affected:
  - HDF5 < 1.14.2
published: '2026-09-16'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T19:34:36.657'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-92627'
references:
  - url: 'https://pulsesecurity.co.nz/advisories/hdf5-memory-corruption'
    label: 0253b833-3e77-4dfe-9d57-17db1a2f0a74
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92627.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-92627'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-92627'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-92627'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2535513'
  - url: 'https://access.redhat.com/errata/RHSA-2026:61630'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00229
epssPercentile: 0.12281
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-17T17:36:04.378638Z'
cvssSource: cna
scores:
  cna: 4.6
  vendor: 4.4
ingestedAt: '2026-09-16T15:58:38.765Z'
patched:
  - hardened_images
---

## Overview

A heap-use-after-free vulnerability exists in H5T__conv_f_f() in src/H5Tconv.c in HDF5 before 1.14.2. When converting a compound datatype containing floating-point members during a dataset read, a temporary buffer allocated with calloc() is freed and subsequently read from within the same conversion routine. An attacker who can supply a crafted HDF5 file containing a specially constructed compound datatype can trigger the use-after-free when the file is parsed by an application that reads the affected dataset, such as h5dump. This can result in a crash and, depending on heap layout and allocator behavior, may be exploitable for further memory corruption up to remote code execution.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux AI (RHEL AI) 3, Red Hat OpenStack Platform 13 (Queens) · no fix planned: Red Hat Enterprise Linux AI (RHEL AI) 3, Red Hat OpenStack Platform 13 (Queens) · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92627.json)
- **RHSA-2026:61630** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-08-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:61630)