CVE-2026-94284 (GCVE-0-2026-94284)
Vulnerability from cvelistv5 – Published: 2026-09-28 08:42 – Updated: 2026-09-30 12:48
VLAI
EPSS
VEX
Title
Out-of-bounds read vulnerability in libX11's XIM trigger-keyregistration parser.registration parser
Summary
An out-of-bounds read vulnerability in libX11's XIM trigger-key registration parser in libX11 before 1.8.14 could be used by malicious X servers to crash attached X clients.
Severity
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-30 12:46 UTC
CWE
- CWE-125 - Out-of-bounds read
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://gitlab.freedesktop.org/xorg/lib/libx11/-/… | patch |
Impacted products
Date Public
2026-09-28 08:34
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-94284",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-09-30T12:46:23.332148Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-09-30T12:48:29.140Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"packageName": "libX11",
"product": "libX11",
"repo": "https://gitlab.freedesktop.org/xorg/lib/libx11",
"vendor": "x.org",
"versions": [
{
"lessThan": "1.8.14",
"status": "affected",
"version": "0",
"versionType": "rpm"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:x.org:libx11:*:*:*:*:*:*:*:*",
"versionEndExcluding": "1.8.14",
"versionStartIncluding": "0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "OR"
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "AISLE in partnership with Red Hat"
}
],
"datePublic": "2026-09-28T08:34:00.000Z",
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eAn out-of-bounds read vulnerability in libX11\u0027s XIM trigger-key registration parser in libX11 before 1.8.14 could be used by malicious X servers to crash attached X clients.\u003c/p\u003e\u003cbr\u003e"
}
],
"value": "An out-of-bounds read vulnerability in libX11\u0027s XIM trigger-key registration parser in libX11 before 1.8.14 could be used by malicious X servers to crash attached X clients."
}
],
"impacts": [
{
"capecId": "CAPEC-540",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-540 Overread Buffers"
}
]
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-125",
"description": "CWE-125 Out-of-bounds read",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-28T08:42:56.885Z",
"orgId": "404e59f5-483d-4b8a-8e7a-e67604dd8afb",
"shortName": "suse"
},
"references": [
{
"tags": [
"patch"
],
"url": "https://gitlab.freedesktop.org/xorg/lib/libx11/-/merge_requests/310/diffs?commit_id=1b7904002d212eed40949ccf4e8e7156f9fec0e2"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "Out-of-bounds read vulnerability in libX11\u0027s XIM trigger-keyregistration parser.registration parser",
"x_generator": {
"engine": "Vulnogram 1.0.5"
}
}
},
"cveMetadata": {
"assignerOrgId": "404e59f5-483d-4b8a-8e7a-e67604dd8afb",
"assignerShortName": "suse",
"cveId": "CVE-2026-94284",
"datePublished": "2026-09-28T08:42:56.885Z",
"dateReserved": "2026-09-21T09:33:25.369Z",
"dateUpdated": "2026-09-30T12:48:29.140Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-94284",
"date": "2026-09-30",
"epss": "0.00103",
"percentile": "0.00914"
},
"microsoft_vex": {
"current_release_date": "2026-09-29T01:04:23.000Z",
"cve": "CVE-2026-94284",
"id": "msrc_CVE-2026-94284",
"initial_release_date": "2026-09-29T01:04:23.000Z",
"product_status:known_affected": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "Out-of-bounds read vulnerability in libX11\u0027s XIM trigger-keyregistration parser.registration parser",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-94284.json",
"version": "1"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"packageName": "libX11",
"product": "libX11",
"repo": "https://gitlab.freedesktop.org/xorg/lib/libx11",
"vendor": "x.org",
"versions": [
{
"lessThan": "1.8.14",
"status": "affected",
"version": "0",
"versionType": "rpm"
}
]
}
],
"source": "meissner@suse.de"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "An out-of-bounds read vulnerability in libX11\u0027s XIM trigger-key registration parser in libX11 before 1.8.14 could be used by malicious X servers to crash attached X clients."
}
],
"id": "CVE-2026-94284",
"lastModified": "2026-09-30T13:17:26.410",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 3.6,
"source": "meissner@suse.de",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-94284",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-09-30T12:46:23.332148Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-09-28T09:17:08.247",
"references": [
{
"source": "meissner@suse.de",
"url": "https://gitlab.freedesktop.org/xorg/lib/libx11/-/merge_requests/310/diffs?commit_id=1b7904002d212eed40949ccf4e8e7156f9fec0e2"
}
],
"sourceIdentifier": "meissner@suse.de",
"vulnStatus": "Awaiting Analysis",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-125"
}
],
"source": "meissner@suse.de",
"type": "Secondary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-09-29T07:28:40+00:00",
"cve": "CVE-2026-94284",
"id": "CVE-2026-94284",
"initial_release_date": "2026-09-28T08:42:56.885000+00:00",
"product_status:known_affected": "23",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "libX11: libX11: Denial of Service via out-of-bounds read in XIM trigger-key registration parser",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-94284.json",
"version": "3"
},
"vulnrichment": {
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-94284",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-09-30T12:46:23.332148Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-09-30T12:48:23.967Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"packageName": "libX11",
"product": "libX11",
"repo": "https://gitlab.freedesktop.org/xorg/lib/libx11",
"vendor": "x.org",
"versions": [
{
"lessThan": "1.8.14",
"status": "affected",
"version": "0",
"versionType": "rpm"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:x.org:libx11:*:*:*:*:*:*:*:*",
"versionEndExcluding": "1.8.14",
"versionStartIncluding": "0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "OR"
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "AISLE in partnership with Red Hat"
}
],
"datePublic": "2026-09-28T08:34:00.000Z",
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eAn out-of-bounds read vulnerability in libX11\u0027s XIM trigger-key registration parser in libX11 before 1.8.14 could be used by malicious X servers to crash attached X clients.\u003c/p\u003e\u003cbr\u003e"
}
],
"value": "An out-of-bounds read vulnerability in libX11\u0027s XIM trigger-key registration parser in libX11 before 1.8.14 could be used by malicious X servers to crash attached X clients."
}
],
"impacts": [
{
"capecId": "CAPEC-540",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-540 Overread Buffers"
}
]
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-125",
"description": "CWE-125 Out-of-bounds read",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-28T08:42:56.885Z",
"orgId": "404e59f5-483d-4b8a-8e7a-e67604dd8afb",
"shortName": "suse"
},
"references": [
{
"tags": [
"patch"
],
"url": "https://gitlab.freedesktop.org/xorg/lib/libx11/-/merge_requests/310/diffs?commit_id=1b7904002d212eed40949ccf4e8e7156f9fec0e2"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "Out-of-bounds read vulnerability in libX11\u0027s XIM trigger-keyregistration parser.registration parser",
"x_generator": {
"engine": "Vulnogram 1.0.5"
}
}
},
"cveMetadata": {
"assignerOrgId": "404e59f5-483d-4b8a-8e7a-e67604dd8afb",
"assignerShortName": "suse",
"cveId": "CVE-2026-94284",
"datePublished": "2026-09-28T08:42:56.885Z",
"dateReserved": "2026-09-21T09:33:25.369Z",
"dateUpdated": "2026-09-30T12:48:29.140Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
Loading…