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Fencer Vulns
high 8.8

CVE-2021-46242 json

HDF5 v1.13.1-1 was discovered to contain a heap-use-after free via the component H5AC_unpin_entry.

published 2022-01-21 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-32942

cvss
8.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 69%
public exploits
0
none known

Summary

HDF5 v1.13.1-1 was discovered to contain a heap-use-after free via the component H5AC_unpin_entry.

Patch / fix

  • hdf5 Debian 14, Debian 13 1.14.5+repack-1

debian advisories DEBIAN-CVE-2021-46242

  • hdf5_1_10_8-gnu-hpc SLE Module for Package Hub 15 SP3, SLE Module for HPC 15 SP3, openSUSE Leap 15.4 +1 more 1.10.8-150300.4.6.1
  • hdf5_1_10_8-gnu-mpich-hpc SLE Module for Package Hub 15 SP3, SLE Module for HPC 15 SP3, openSUSE Leap 15.4 +1 more 1.10.8-150300.4.6.1
  • hdf5_1_10_8-gnu-mvapich2-hpc SLE Module for Package Hub 15 SP3, SLE Module for HPC 15 SP3, openSUSE Leap 15.4 +1 more 1.10.8-150300.4.6.1
  • hdf5_1_10_8-gnu-openmpi3-hpc SLE Module for Package Hub 15 SP3, SLE Module for HPC 15 SP3, openSUSE Leap 15.4 +1 more 1.10.8-150300.4.6.1
  • hdf5_1_10_8-gnu-openmpi4-hpc SLE Module for Package Hub 15 SP3, SLE Module for HPC 15 SP3, openSUSE Leap 15.4 +1 more 1.10.8-150300.4.6.1
  • hdf5_1_10_8-gnu-hpc SLE High Performance Computing 15-LTSS, SLE High Performance Computing 15-ESPOS 1.10.8-150000.8.7.1
  • hdf5_1_10_8-gnu-mpich-hpc SLE High Performance Computing 15-LTSS, SLE High Performance Computing 15-ESPOS 1.10.8-150000.8.7.1
  • hdf5_1_10_8-gnu-mvapich2-hpc SLE High Performance Computing 15-LTSS, SLE High Performance Computing 15-ESPOS 1.10.8-150000.8.7.1

suse advisories SUSE-SU-2022:3829-1SUSE-SU-2022:3828-1SUSE-SU-2022:3827-1SUSE-SU-2022:3826-1SUSE-SU-2022:3825-1SUSE-SU-2022:3824-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-46242 updated cvss 8.0

hdf5: Heap-use-after free via the component H5AC_unpin_entry

  • Red Hat OpenStack Platform 13 (Queens) hdf5
    affected: no fix planned “Out of support scope”
  • Red Hat OpenStack Platform 16.1 hdf5
    affected: no fix planned “Will not fix”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.25% chance of exploitation in the next 30 days, higher than 69% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/HDFGroup/hdf5/issues/1329 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.