CVE-2026-26936 (GCVE-0-2026-26936)
Vulnerability from cvelistv5 – Published: 2026-02-26 17:07 – Updated: 2026-02-26 18:28
VLAI
EPSS
VEX
Title
Inefficient Regular Expression Complexity in Kibana Leading to Denial of Service
Summary
Inefficient Regular Expression Complexity (CWE-1333) in the AI Inference Anonymization Engine in Kibana can lead Denial of Service via Regular Expression Exponential Blowup (CAPEC-492).
Severity
4.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-02-26 17:51 UTC
CWE
- CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
1 reference
Impacted products
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-26936",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-02-26T17:51:55.551693Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-02-26T18:28:11.114Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Kibana",
"vendor": "Elastic",
"versions": [
{
"lessThanOrEqual": "9.2.4",
"status": "affected",
"version": "9.0.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.19.10",
"status": "affected",
"version": "8.0.0",
"versionType": "semver"
}
]
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eInefficient Regular Expression Complexity (CWE-1333) in the AI Inference Anonymization Engine in Kibana can lead Denial of Service via Regular Expression Exponential Blowup (CAPEC-492).\u003c/p\u003e"
}
],
"value": "Inefficient Regular Expression Complexity (CWE-1333) in the AI Inference Anonymization Engine in Kibana can lead Denial of Service via Regular Expression Exponential Blowup (CAPEC-492)."
}
],
"impacts": [
{
"capecId": "CAPEC-492",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-492 Regular Expression Exponential Blowup"
}
]
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 4.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "HIGH",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-1333",
"description": "CWE-1333 Inefficient Regular Expression Complexity",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-02-26T17:07:40.604Z",
"orgId": "271b6943-45a9-4f3a-ab4e-976f3fa05b5a",
"shortName": "elastic"
},
"references": [
{
"url": "https://discuss.elastic.co/t/kibana-8-19-11-9-2-5-security-update-esa-2026-14/385250"
}
],
"source": {
"discovery": "Elastic"
},
"title": "Inefficient Regular Expression Complexity in Kibana Leading to Denial of Service",
"x_generator": {
"engine": "Elastic CVE Publisher 0.0.1"
}
}
},
"cveMetadata": {
"assignerOrgId": "271b6943-45a9-4f3a-ab4e-976f3fa05b5a",
"assignerShortName": "elastic",
"cveId": "CVE-2026-26936",
"datePublished": "2026-02-26T17:07:40.604Z",
"dateReserved": "2026-02-16T16:42:05.774Z",
"dateUpdated": "2026-02-26T18:28:11.114Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-26936",
"date": "2026-09-28",
"epss": "0.00525",
"percentile": "0.42199"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Kibana",
"vendor": "Elastic",
"versions": [
{
"lessThanOrEqual": "9.2.4",
"status": "affected",
"version": "9.0.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.19.10",
"status": "affected",
"version": "8.0.0",
"versionType": "semver"
}
]
}
],
"source": "security@elastic.co"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:elastic:kibana:*:*:*:*:*:*:*:*",
"matchCriteriaId": "6617179C-2808-48E0-9794-119BBEE79D9E",
"versionEndExcluding": "8.19.11",
"versionStartIncluding": "8.0.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:elastic:kibana:*:*:*:*:*:*:*:*",
"matchCriteriaId": "777B69F7-F3EB-491F-8B6D-418A0E9C0D02",
"versionEndExcluding": "9.2.5",
"versionStartIncluding": "9.0.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Inefficient Regular Expression Complexity (CWE-1333) in the AI Inference Anonymization Engine in Kibana can lead Denial of Service via Regular Expression Exponential Blowup (CAPEC-492)."
},
{
"lang": "es",
"value": "Complejidad Ineficiente de Expresiones Regulares (CWE-1333) en el Motor de Anonimizaci\u00f3n de Inferencia de IA en Kibana puede provocar denegaci\u00f3n de servicio mediante la Expansi\u00f3n Exponencial de Expresiones Regulares (CAPEC-492)."
}
],
"id": "CVE-2026-26936",
"lastModified": "2026-06-17T10:26:25.040",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 4.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "HIGH",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.2,
"impactScore": 3.6,
"source": "security@elastic.co",
"type": "Secondary"
},
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-26936",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-02-26T17:51:55.551693Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-02-26T18:23:07.973",
"references": [
{
"source": "security@elastic.co",
"tags": [
"Vendor Advisory"
],
"url": "https://discuss.elastic.co/t/kibana-8-19-11-9-2-5-security-update-esa-2026-14/385250"
}
],
"sourceIdentifier": "security@elastic.co",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-1333"
}
],
"source": "security@elastic.co",
"type": "Secondary"
}
]
}
},
"vulnrichment": {
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-26936",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-02-26T17:51:55.551693Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-02-26T17:53:26.995Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Kibana",
"vendor": "Elastic",
"versions": [
{
"lessThanOrEqual": "9.2.4",
"status": "affected",
"version": "9.0.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.19.10",
"status": "affected",
"version": "8.0.0",
"versionType": "semver"
}
]
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eInefficient Regular Expression Complexity (CWE-1333) in the AI Inference Anonymization Engine in Kibana can lead Denial of Service via Regular Expression Exponential Blowup (CAPEC-492).\u003c/p\u003e"
}
],
"value": "Inefficient Regular Expression Complexity (CWE-1333) in the AI Inference Anonymization Engine in Kibana can lead Denial of Service via Regular Expression Exponential Blowup (CAPEC-492)."
}
],
"impacts": [
{
"capecId": "CAPEC-492",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-492 Regular Expression Exponential Blowup"
}
]
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 4.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "HIGH",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-1333",
"description": "CWE-1333 Inefficient Regular Expression Complexity",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-02-26T17:07:40.604Z",
"orgId": "271b6943-45a9-4f3a-ab4e-976f3fa05b5a",
"shortName": "elastic"
},
"references": [
{
"url": "https://discuss.elastic.co/t/kibana-8-19-11-9-2-5-security-update-esa-2026-14/385250"
}
],
"source": {
"discovery": "Elastic"
},
"title": "Inefficient Regular Expression Complexity in Kibana Leading to Denial of Service",
"x_generator": {
"engine": "Elastic CVE Publisher 0.0.1"
}
}
},
"cveMetadata": {
"assignerOrgId": "271b6943-45a9-4f3a-ab4e-976f3fa05b5a",
"assignerShortName": "elastic",
"cveId": "CVE-2026-26936",
"datePublished": "2026-02-26T17:07:40.604Z",
"dateReserved": "2026-02-16T16:42:05.774Z",
"dateUpdated": "2026-02-26T18:28:11.114Z",
"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…