Vulnerability · Published Jul 27, 2026 · Assigned by HDFG
CVE-2026-17574NULL Pointer Dereference in HDF5 via Invalid Variable-Length Datatype Type Tag
Medium 5.2
In plain English
A medium-severity null pointer dereference in HDF5 from The HDF Group. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 4% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 4.0)5.2Medium
Exploit odds (30 days)0.1%top 96.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
HDF5 contains a NULL pointer dereference vulnerability. Processing a crafted HDF5 file containing an attribute with an invalid variable-length datatype type field may cause the application to crash when the attribute is read.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | hdf5 | no fix listed | DEBIAN-CVE-2026-17574 |
| Debian:13 | hdf5 | no fix listed | DEBIAN-CVE-2026-17574 |
| Debian:14 | hdf5 | 2.2.0+repack-1 | DEBIAN-CVE-2026-17574 |
| Ubuntu:22.04:LTS | hdf5 | no fix listed | UBUNTU-CVE-2026-17574 |
| Ubuntu:24.04:LTS | hdf5 | no fix listed | UBUNTU-CVE-2026-17574 |
| Ubuntu:26.04:LTS | hdf5 | no fix listed | UBUNTU-CVE-2026-17574 |
| Ubuntu:26.10 | hdf5 | no fix listed | UBUNTU-CVE-2026-17574 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| The HDF Group | HDF5 | <= 2.1.1 |
Weakness: CWE-617, CWE-476 · Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P