Exploitation evidence
Not listed in the latest downloaded CISA KEV catalog. This does not establish an absence of exploitation.
KEV checked 13 Nov 2026, 00:20 Jerusalem · Original catalog ↗Reported products and versions
The HDF Group / HDF5
Default status: unaffected
- affected: < 2.3.0
Fixes and workarounds
No explicit solution text in the downloaded CVE record. Consult the vendor advisory; unaffected version ranges are shown above as reported, not inferred as a patch recommendation.
Sources and related reporting
CVE Program record ↗ · Download tracked evidence as JSON
Monitored source mentions
Shared CVE identifiers link source mentions; they do not establish that the reports describe the same incident.
Observed change timeline
History begins when Egret first downloads each source. It is not the complete upstream CVE history.
12 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-12",
"epss": 0.0014,
"percentile": 0.03399
}11 Nov 2026, 12:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-10",
"epss": 0.0014,
"percentile": 0.03378
}11 Nov 2026, 12:20 Jerusalem · CVE Program record changed
Stored CNA snapshot at this observation.
{
"containers": {
"adp": [
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"metrics": [
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"other": {
"content": {
"id": "CVE-2026-120758",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
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],
"role": "CISA Coordinator",
"timestamp": "2026-11-03T17:51:46.159121Z",
"version": "2.0.3"
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"type": "ssvc"
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"providerMetadata": {
"dateUpdated": "2026-11-03T17:52:03.376Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "HDF5",
"vendor": "The HDF Group",
"versions": [
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"status": "affected",
"version": "< 2.3.0"
}
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],
"descriptions": [
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"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->prfx</code> or <code>heap->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. "
}
],
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"capecId": "CAPEC-153",
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"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "LOCAL",
"baseScore": 5.4,
"baseSeverity": "MEDIUM",
"exploitMaturity": "PROOF_OF_CONCEPT",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "PASSIVE",
"valueDensity": "NOT_DEFINED",
"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",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "NONE",
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"vulnerabilityResponseEffort": "NOT_DEFINED"
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"value": "GENERAL"
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"descriptions": [
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"cweId": "CWE-476",
"description": "CWE-476 NULL pointer dereference",
"lang": "en",
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"dateUpdated": "2026-11-03T15:38:09.387Z",
"orgId": "0253b833-3e77-4dfe-9d57-17db1a2f0a74",
"shortName": "HDFG"
},
"references": [
{
"url": "https://github.com/HDFGroup/hdf5/pull/6377"
}
],
"source": {
"discovery": "UNKNOWN"
},
"title": "NULL Pointer Dereference in H5HL_unprotect via Corrupted File",
"x_generator": {
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"cveMetadata": {
"assignerOrgId": "0253b833-3e77-4dfe-9d57-17db1a2f0a74",
"assignerShortName": "HDFG",
"cveId": "CVE-2026-120758",
"datePublished": "2026-11-03T15:38:09.387Z",
"dateReserved": "2026-11-02T21:30:12.341Z",
"dateUpdated": "2026-11-03T17:52:03.376Z",
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