{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-120758", "assignerOrgId": "0253b833-3e77-4dfe-9d57-17db1a2f0a74", "state": "PUBLISHED", "assignerShortName": "HDFG", "dateReserved": "2026-11-02T21:30:12.341Z", "datePublished": "2026-11-03T15:38:09.387Z", "dateUpdated": "2026-11-03T15:38:09.387Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "0253b833-3e77-4dfe-9d57-17db1a2f0a74", "shortName": "HDFG", "dateUpdated": "2026-11-03T15:38:09.387Z"}, "title": "NULL Pointer Dereference in H5HL_unprotect via Corrupted File", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-476", "description": "CWE-476 NULL pointer dereference", "type": "CWE"}]}], "impacts": [{"capecId": "CAPEC-153", "descriptions": [{"lang": "en", "value": "CAPEC-153 Input Data Manipulation"}]}], "affected": [{"vendor": "The HDF Group", "product": "HDF5", "versions": [{"status": "affected", "version": "< 2.3.0"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "HDF5 through 2.2.0 contains a NULL pointer dereference vulnerability in H5HL_unprotect() in src/H5HL.c. H5HL_protect() pins a single metadata cache entry for a local heap, either the heap prefix or the separate data block, and H5HL_unprotect() unpins it on the final unprotect. When the metadata cache destroys a corrupted local heap entry, H5HL__prfx_dest() unlinks it from the heap by setting heap->prfx or heap->dblk to NULL. A crafted HDF5 file can therefore reach H5HL_unprotect() with no cached object to unpin, and the function passes the NULL pointer to H5AC_unpin_entry(). This causes an assertion failure in debug builds and a NULL pointer dereference and crash in release builds. An attacker who can get a user or application to open and traverse a malicious file can cause a denial of service.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "HDF5 through 2.2.0 contains a NULL pointer dereference vulnerability in <code>H5HL_unprotect()</code> in <code>src/H5HL.c</code>. <code>H5HL_protect()</code> pins a single metadata cache entry for a local heap, either the heap prefix or the separate data block, and <code>H5HL_unprotect()</code> unpins it on the final unprotect. When the metadata cache destroys a corrupted local heap entry, <code>H5HL__prfx_dest()</code> unlinks it from the heap by setting <code>heap-&gt;prfx</code> or <code>heap-&gt;dblk</code> to NULL. A crafted HDF5 file can therefore reach <code>H5HL_unprotect()</code> with no cached object to unpin, and the function passes the NULL pointer to <code>H5AC_unpin_entry()</code>. This causes an assertion failure in debug builds and a NULL pointer dereference and crash in release builds. An attacker who can get a user or application to open and traverse a malicious file can cause a denial of service.&nbsp;&nbsp;"}]}], "references": [{"url": "https://github.com/HDFGroup/hdf5/pull/6377"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "NONE", "exploitMaturity": "PROOF_OF_CONCEPT", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "MEDIUM", "baseScore": 5.4, "vectorString": "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/E:P"}}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "Vulnogram 1.0.5"}}}}

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