CVE-2026-26199: Buffer underflow in `H5Iget_name `/`H5G_get_name` if size is zero

unknownCVE-2026-26199

CSIRTS triage

What: A buffer underflow issue in certain HDF5 functions has been identified.
Who is affected: No specific deployments or versions are mentioned.
Urgency: The urgency is unclear as the severity is listed as unknown.
Action: No specific action is provided.

AI-assisted analysis generated from the source advisory — verify against the original.

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: unknown
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26199

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-261990.26% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 17% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-26199	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

unknownCVE-2026-26199: HDF5 is a high-performance library and a file format specification that implements the HDF5 da…nvd

Recent advisories for Buffer underflow in

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

mediumCVE-2026-66337: A flaw was found in libsoup. An unsigned integer underflow in the soup_filter_input_stream_rea…nvd · 2026-07-24
unknownCVE-2026-16439: In Eclipse OpenJ9 versions up to 0.60, using -Xtrace to trace method arguments can lead to buf…nvd · 2026-07-21
highCVE-2026-63883: In the Linux kernel, the following vulnerability has been resolved: serial: qcom_geni: fix kfi…nvd · 2026-07-19