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CVE-2026-19025— HDF5 divide-by-zero (SIGFPE) via mismatched chunk-layout dimensionality and dataspace rank on dataset open

Quick assessment

Affected
The HDF Group HDF5
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

The HDF Group HDF5是The HDF Group组织的一款面向科学数据的分层存储格式。 The HDF Group HDF5 2.3.0及之前版本存在数字错误漏洞，该漏洞源于H5O__layout_decode函数未验证块数据集存储的块布局维度与数据空间秩是否匹配，可能导致攻击者通过特制HDF5文件引发除零错误和应用崩溃，造成拒绝服务。

CVSS 6.8 · Medium EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
The HDF Group HDF5 <= 2.3.0 affected
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I. Basic Information for CVE-2026-19025

Vulnerability Information
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Vulnerability Title
HDF5 divide-by-zero (SIGFPE) via mismatched chunk-layout dimensionality and dataspace rank on dataset open
Source: CVE Program / CVE List V5
Vulnerability Description
H5O__layout_decode in H5Olayout.c in HDF5 through 2.3.0 does not validate that a chunked dataset's stored chunk-layout dimensionality matches its dataspace rank when an existing dataset is opened, whereas this check is performed only at dataset-creation time. This allows attackers to cause a denial of service (divide-by-zero and application crash in H5S__hyper_iter_get_seq_list in src/H5Shyper.c) via a crafted HDF5 file with mismatched chunk/dataspace ranks that is opened and read via H5Dopen2 and H5Dread, e.g. by the h5repack tool.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
除零错误
Source: CVE Program / CVE List V5
Vulnerability Title
The HDF Group HDF5 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
The HDF Group HDF5是The HDF Group组织的一款面向科学数据的分层存储格式。 The HDF Group HDF5 2.3.0及之前版本存在数字错误漏洞，该漏洞源于H5O__layout_decode函数未验证块数据集存储的块布局维度与数据空间秩是否匹配，可能导致攻击者通过特制HDF5文件引发除零错误和应用崩溃，造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
The HDF Group HDF5 <= 2.3.0 -

II. Public POCs for CVE-2026-19025

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III. Intelligence Information for CVE-2026-19025

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Other References for CVE-2026-19025 (1)

Same Patch Batch · The HDF Group · 2026-08-05 · 6 CVEs total

CVE-2026-19024 8.2 HIGH HDF5 H5Pget_fill_value NULL Pointer Dereference via Malformed Fill Value Message
CVE-2026-19027 6.9 MEDIUM HDF5 out-of-bounds heap read in N-Bit filter decompression
CVE-2026-19023 6.8 MEDIUM HDF5 h5dump Untrusted Pointer Dereference in Binary Output of Variable-Length String Datas
CVE-2026-19026 6.8 MEDIUM Nbit filter NULL/short parameter-array dereference
CVE-2026-19028 6.8 MEDIUM HDF5 integer underflow in Fletcher32 filter leads to massive out-of-bounds read

IV. Related Vulnerabilities

Same product: HDF5
Same vendor: The HDF Group
Same weakness: CWE-369

V. Comments for CVE-2026-19025

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