Upstream information
Description
HDF5 through 2.2.0 contains a heap buffer over-read vulnerability in H5L__extern_traverse() in src/H5Lexternal.c, the default traversal callback for external links. The callback locates the target file name and object path within the link's user data using strlen() without validating the buffer against its stored size (udata_size, which was marked unused). A crafted HDF5 file containing an external link whose data is not NULL-terminated, or is too short to hold both strings, causes strlen() to read past the end of the udata heap buffer, and the derived object path pointer may also point outside the buffer. The overrun is unbounded and continues until a zero byte is found. The flaw is triggered when the malicious link is traversed, for example when opening an object through it. An attacker who can get a user or application to access a crafted file can cause a denial of service, and adjacent heap contents may be incorporated into the external file name or object path the library attempts to open.SUSE information
Overall state of this security issue: Pending
This issue is currently rated as having moderate severity.
| CVSS detail | National Vulnerability Database | SUSE |
|---|---|---|
| Base Score | 7.1 | 6.1 |
| Vector | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H |
| Attack Vector | Local | Local |
| Attack Complexity | Low | Low |
| Privileges Required | None | None |
| User Interaction | Required | Required |
| Scope | Unchanged | Unchanged |
| Confidentiality Impact | High | Low |
| Integrity Impact | None | None |
| Availability Impact | High | High |
| CVSSv3 Version | 3.1 | 3.1 |
| CVSS detail | CNA (0253b833-3e77-4dfe-9d57-17db1a2f0a74) | SUSE |
|---|---|---|
| Base Score | 6.9 | 6.9 |
| Vector | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N |
| Attack Vector | Local | Local |
| Attack Complexity | Low | Low |
| Attack Requirements | None | None |
| Privileges Required | None | None |
| User Interaction | Passive | Passive |
| Vulnerable System Confidentiality Impact | Low | Low |
| Vulnerable System Integrity Impact | None | None |
| Vulnerable System Availability Impact | High | High |
| Subsequent System Confidentiality Impact | None | None |
| Subsequent System Integrity Impact | None | None |
| Subsequent System Availability Impact | None | None |
| CVSSv4 Version | 4.0 | 4.0 |
Status of this issue by product and package
Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification. The updates are grouped by state of their lifecycle. SUSE product lifecycles are documented on the lifecycle page.
| Product(s) | Source package | State |
|---|---|---|
| Products under general support and receiving all security fixes. | ||
| SUSE Linux Enterprise Module for Package Hub 15 SP7 | hdf5 | Affected |
| Products under Long Term Service Pack support and receiving important and critical security fixes. | ||
| SUSE Linux Enterprise High Performance Computing 12 SP5 | hdf5 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | hdf5 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | hdf5 | Affected |
| SUSE Linux Enterprise Module for HPC 12 | hdf5 | Affected |
| SUSE Linux Enterprise Server 12 SP5 | hdf5 | Affected |
| SUSE Linux Enterprise Server 15 SP6-LTSS | hdf5 | Affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP5 | hdf5 | Affected |
| Products past their end of life and not receiving proactive updates anymore. | ||
| SUSE Linux Enterprise High Performance Computing 12 SP2 | hdf5 | Affected |
| SUSE Linux Enterprise High Performance Computing 12 SP3 | hdf5 | Affected |
| SUSE Linux Enterprise High Performance Computing 12 SP4 | hdf5 | Affected |
| SUSE Linux Enterprise Server 12 SP2 | hdf5 | Affected |
| SUSE Linux Enterprise Server 12 SP3 | hdf5 | Affected |
| SUSE Linux Enterprise Server 12 SP4 | hdf5 | Affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP2 | hdf5 | Affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP3 | hdf5 | Affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP4 | hdf5 | Affected |
SUSE Timeline for this CVE
CVE page created: Wed Nov 4 14:55:22 2026CVE page last modified: Wed Nov 4 17:54:47 2026