CVE-2026-26936

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2026-26936
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-26936.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-26936
Aliases
Downstream
Published
2026-02-26T17:07:40.604Z
Modified
2026-07-15T19:06:41.587535Z
Severity
  • 4.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
Inefficient Regular Expression Complexity in Kibana Leading to Denial of Service
Details

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).

Database specific 
{
    "cna_assigner": "elastic",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26936.json",
    "cwe_ids": [
        "CWE-1333"
    ],
    "unresolved_ranges": [
        {
            "source": "AFFECTED_FIELD",
            "extracted_events": [
                {
                    "introduced": "9.0.0"
                },
                {
                    "last_affected": "9.2.4"
                },
                {
                    "introduced": "8.0.0"
                },
                {
                    "last_affected": "8.19.10"
                }
            ]
        }
    ]
}
References

Affected packages

Git / github.com/elastic/elasticsearch

Affected ranges

Type
GIT
Repo
https://github.com/elastic/elasticsearch
Events
Introduced
1b6a7ece17463df5ff54a3e1302d825889aa1161
Fixed
c5253e1bcb0268a5dafed9dee18e16fd3144d7d6
Introduced
112859b85d50de2a7e63f73c8fc70b99eea24291
Fixed
c26a2652b4f4e323c18bdb4f56f0038c8aece886
Database specific 
{
    "cpe": "cpe:2.3:a:elastic:kibana:*:*:*:*:*:*:*:*",
    "source": "CPE_RANGE",
    "extracted_events": [
        {
            "introduced": "8.0.0"
        },
        {
            "fixed": "8.19.11"
        },
        {
            "introduced": "9.0.0"
        },
        {
            "fixed": "9.2.5"
        }
    ]
}

Database specific

vanir_signatures_modified 
"2026-07-15T19:06:41Z"
source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-26936.json"
vanir_signatures 
[
    {
        "target": {
            "file": "x-pack/qa/smoke-test-plugins/src/yamlRestTest/java/org/elasticsearch/smoketest/XSmokeTestPluginsClientYamlTestSuiteIT.java"
        },
        "deprecated": false,
        "source": "https://github.com/elastic/elasticsearch/commit/c5253e1bcb0268a5dafed9dee18e16fd3144d7d6",
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "67958334585825714849455926389824173504",
                "49769434037812949664189021955097285593",
                "107611419671639204768516196227487681074",
                "48312006114770059720746865713989822929",
                "248958784273211857044989620787872488517",
                "75802550358090574096053905707144603959",
                "21560704965187282733380529487578996276",
                "8326220523718658525643826498535441288",
                "213342091194022385860304242610174038525",
                "315819863610486750302894041420463677234",
                "148630765578338457959192664825300294092",
                "167479143163991302743966239210217273901",
                "190946360178340220594583878190102844445"
            ]
        },
        "id": "CVE-2026-26936-138534e9",
        "signature_type": "Line",
        "signature_version": "v1"
    },
    {
        "target": {
            "file": "build-tools-internal/src/main/java/org/elasticsearch/gradle/internal/RestrictedBuildApiService.java",
            "function": "createLegacyRestTestBasePluginUsage"
        },
        "deprecated": false,
        "source": "https://github.com/elastic/elasticsearch/commit/c5253e1bcb0268a5dafed9dee18e16fd3144d7d6",
        "digest": {
            "function_hash": "155620418688305992948385524838569426919",
            "length": 4740.0
        },
        "id": "CVE-2026-26936-34ba32cc",
        "signature_type": "Function",
        "signature_version": "v1"
    },
    {
        "target": {
            "file": "qa/packaging/src/test/java/org/elasticsearch/packaging/test/DebPreservationTests.java"
        },
        "deprecated": false,
        "source": "https://github.com/elastic/elasticsearch/commit/c26a2652b4f4e323c18bdb4f56f0038c8aece886",
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "104341741720985942956856196937647807500",
                "271151612312193955454724471074202598864",
                "165377307239638983758185782901512973983"
            ]
        },
        "id": "CVE-2026-26936-49f06dd7",
        "signature_type": "Line",
        "signature_version": "v1"
    },
    {
        "target": {
            "file": "build-tools-internal/src/main/java/org/elasticsearch/gradle/internal/RestrictedBuildApiService.java"
        },
        "deprecated": false,
        "source": "https://github.com/elastic/elasticsearch/commit/c5253e1bcb0268a5dafed9dee18e16fd3144d7d6",
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "78637196553999327818313358661597015893",
                "260357489921711909644179055701012144494",
                "168171097652227989481226126387620450914",
                "276019913365898672716067232276777300496",
                "39902617813431869600351512456501808243",
                "129731127940613826295029063901046874891",
                "241800218635807528117255849270828382938",
                "195098916670087081962653811752912119348",
                "142290314229480930363705806533655642610",
                "89148120390549035649496953382118294449",
                "14714953909408205505242916320820244884",
                "174751036001569857786587416259331727361",
                "185746039614020417623603381703876744468",
                "22934068466036208257905390040540738054"
            ]
        },
        "id": "CVE-2026-26936-8bac0d2b",
        "signature_type": "Line",
        "signature_version": "v1"
    },
    {
        "target": {
            "file": "qa/packaging/src/test/java/org/elasticsearch/packaging/test/DebPreservationTests.java",
            "function": "test40RestartOnUpgrade"
        },
        "deprecated": false,
        "source": "https://github.com/elastic/elasticsearch/commit/c26a2652b4f4e323c18bdb4f56f0038c8aece886",
        "digest": {
            "function_hash": "141232404052381431885839358425350982043",
            "length": 369.0
        },
        "id": "CVE-2026-26936-d758fb5b",
        "signature_type": "Function",
        "signature_version": "v1"
    }
]

Git / github.com/elastic/kibana

Affected ranges

Type
GIT
Repo
https://github.com/elastic/kibana
Events
Introduced
57ca5e139a33dd2eed927ce98d8231a1f217cd15
Fixed
c14722b56e3d34d5203bd311e91f9ec49227b044
Introduced
504d6bfa94cca17fabb76e06152c30c4f0c3efdd
Fixed
f99524135b3b29ff4011629c9e8511086b1a597a
Database specific 
{
    "cpe": "cpe:2.3:a:elastic:kibana:*:*:*:*:*:*:*:*",
    "source": "CPE_RANGE",
    "extracted_events": [
        {
            "introduced": "8.0.0"
        },
        {
            "fixed": "8.19.11"
        },
        {
            "introduced": "9.0.0"
        },
        {
            "fixed": "9.2.5"
        }
    ]
}

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-26936.json"