🛡️ CVE-2026-19028 on Ubuntu — hdf5

⚪ Unknown ✅ No Known Exploit OSV

N/A

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

H5Z__filter_fletcher32 in H5Zfletcher32.c in HDF5 through 2.3.0 computes the data length to checksum by subtracting the 4-byte trailing checksum size from the input buffer size without checking that the buffer is at least 4 bytes, allowing a size_t underflow. This allows attackers to cause a denial of service (massively out-of-bounds read and application crash in H5_checksum_fletcher32) via a crafted HDF5 file with a Fletcher32-filtered chunk smaller than 4 bytes, triggered via H5Dread, e.g. by the h5ls or h5dump tools.

Distribution advisory

This page covers CVE-2026-19028 as tracked by Ubuntu, for the package hdf5. No fixed version has been recorded for this distribution yet.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. Rated impact: confidentiality none, integrity none, availability high.

Weakness class

UBUNTU-CVE-2026-19028 is classified as CWE-125: Out-of-bounds Read. The code reads past the limits of a buffer, exposing adjacent memory contents or crashing the process.

Affected software

UBUNTU-CVE-2026-19028 is recorded against 1 package.

hdf5

Timeline and source

Published on 6 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

ubuntu.com (Report)
www.cve.org (Report)
github.com (Report)
github.com (Report)
github.com (Report)

Details

Severity Unknown

CVSS Score N/A

CVSS Vector CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CWE N/A

Public Exploit ✅ No

Source OSV

Published 2026-08-06

Updated 2026-08-11

Modified 2026-08-06

Fix URL N/A

Affected Packages

Software	From version	Fixed in
hdf5	—	—

References

REPORT https://ubuntu.com/security/CVE-2026-19028

REPORT https://www.cve.org/CVERecord?id=CVE-2026-19028

REPORT https://github.com/HDFGroup/hdf5/pull/6497

REPORT https://github.com/HDFGroup/hdf5/issues/6488

REPORT https://github.com/HDFGroup/hdf5/issues/6490

🔗 NVD 🔗 Mitre

Similar Threats

Unknown AZL-40531
Unknown AZL-40534
Unknown AZL-40540
Unknown AZL-40543
Unknown AZL-40547

Free Vulnerability Check

Is your site affected by UBUNTU-CVE-2026-19028?

BotEraser helps you identify potentially vulnerable plugins and themes by checking your installation against UBUNTU-CVE-2026-19028 and other known CVE records.

Scan My Site Free →

No credit card required · Results in minutes

ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.