Exploitation evidence
Known exploited · CISA KEV listed
Added 2026-04-13. Ransomware campaign use: Unknown.
CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CISA due date: 2026-04-27. This is the catalog’s deadline, not an assessment of your organization’s exposure.
KEV checked 13 Nov 2026, 00:20 Jerusalem · Original catalog ↗Reported products and versions
Adobe / Acrobat DC
Default status: unaffected
- affected: 0 to ≤ 26.001.21367 (custom)
- unaffected: 26.001.21411 (custom)
Adobe / Acrobat Reader DC
Default status: unaffected
- affected: 0 to ≤ 26.001.21367 (custom)
- unaffected: 26.001.21411 (custom)
Adobe / Acrobat 2024
Default status: unaffected
- affected: 0 to ≤ 24.001.30356 (custom)
- unaffected: 24.001.30362 (Win), 24.001.30360 (Mac) (custom)
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
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": 0.0734,
"percentile": 0.94478
}10 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-10",
"epss": 0.0734,
"percentile": 0.94443
}09 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-09",
"epss": 0.0734,
"percentile": 0.94437
}08 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-08",
"epss": 0.0734,
"percentile": 0.94434
}07 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-07",
"epss": 0.0723,
"percentile": 0.94361
}06 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-06",
"epss": 0.0723,
"percentile": 0.94352
}06 Nov 2026, 06:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-05",
"epss": 0.0723,
"percentile": 0.94348
}04 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-04",
"epss": 0.0723,
"percentile": 0.94344
}03 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-03",
"epss": 0.0723,
"percentile": 0.94334
}03 Nov 2026, 12:20 Jerusalem · CVE Program record changed
Stored CNA snapshot at this observation.
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-34621",
"options": [
{
"Exploitation": "active"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-04-11T00:00:00+00:00",
"version": "2.0.3"
},
"type": "ssvc"
}
},
{
"other": {
"content": {
"dateAdded": "2026-04-13",
"reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34621"
},
"type": "kev"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-04-14T03:55:27.955Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"government-resource"
],
"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34621"
}
],
"timeline": [
{
"lang": "en",
"time": "2026-04-13T00:00:00.000Z",
"value": "CVE-2026-34621 added to CISA KEV"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Acrobat DC",
"vendor": "Adobe",
"versions": [
{
"lessThanOrEqual": "26.001.21367",
"status": "affected",
"version": "0",
"versionType": "custom"
},
{
"status": "unaffected",
"version": "26.001.21411",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "Acrobat Reader DC",
"vendor": "Adobe",
"versions": [
{
"lessThanOrEqual": "26.001.21367",
"status": "affected",
"version": "0",
"versionType": "custom"
},
{
"status": "unaffected",
"version": "26.001.21411",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "Acrobat 2024",
"vendor": "Adobe",
"versions": [
{
"lessThanOrEqual": "24.001.30356",
"status": "affected",
"version": "0",
"versionType": "custom"
},
{
"status": "unaffected",
"version": "24.001.30362 (Win), 24.001.30360 (Mac)",
"versionType": "custom"
}
]
}
],
"datePublic": "2026-04-10T17:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "Acrobat Reader versions 24.001.30356, 26.001.21367 and earlier are affected by an Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"availabilityRequirement": "NOT_DEFINED",
"baseScore": 8.6,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"confidentialityRequirement": "NOT_DEFINED",
"environmentalScore": 8.6,
"environmentalSeverity": "HIGH",
"exploitCodeMaturity": "NOT_DEFINED",
"integrityImpact": "HIGH",
"integrityRequirement": "NOT_DEFINED",
"modifiedAttackComplexity": "LOW",
"modifiedAttackVector": "LOCAL",
"modifiedAvailabilityImpact": "HIGH",
"modifiedConfidentialityImpact": "HIGH",
"modifiedIntegrityImpact": "HIGH",
"modifiedPrivilegesRequired": "NONE",
"modifiedScope": "CHANGED",
"modifiedUserInteraction": "REQUIRED",
"privilegesRequired": "NONE",
"remediationLevel": "NOT_DEFINED",
"reportConfidence": "NOT_DEFINED",
"scope": "CHANGED",
"temporalScore": 8.6,
"temporalSeverity": "HIGH",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-1321",
"description": "Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (CWE-1321)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-27T22:15:48.961Z",
"orgId": "078d4453-3bcd-4900-85e6-15281da43538",
"shortName": "adobe"
},
"references": [
{
"tags": [
"vendor-advisory"
],
"url": "https://helpx.adobe.com/security/products/acrobat/apsb26-43.html"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "Acrobat Reader | Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (CWE-1321)",
"x_generator": {
"engine": "cvelib 1.8.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "078d4453-3bcd-4900-85e6-15281da43538",
"assignerShortName": "adobe",
"cveId": "CVE-2026-34621",
"datePublished": "2026-04-11T06:45:43.512Z",
"dateReserved": "2026-03-30T17:30:36.490Z",
"dateUpdated": "2026-08-27T22:15:48.961Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}03 Nov 2026, 02:22 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-02",
"epss": 0.0723,
"percentile": 0.94327
}03 Nov 2026, 02:22 Jerusalem · CISA KEV status changed
Stored KEV snapshot at this observation.
{
"cveID": "CVE-2026-34621",
"cwes": [
"CWE-1321"
],
"dateAdded": "2026-04-13",
"dueDate": "2026-04-27",
"forensicTriage": "No",
"knownRansomwareCampaignUse": "Unknown",
"notes": "https://helpx.adobe.com/security/products/acrobat/apsb26-43.html ; https://nvd.nist.gov/vuln/detail/CVE-2026-34621",
"product": "Acrobat and Reader",
"requiredAction": "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.",
"shortDescription": "Adobe Acrobat and Reader contain a prototype pollution vulnerability that allows for arbitrary code execution.",
"vendorProject": "Adobe",
"vulnerabilityName": "Adobe Acrobat and Reader Prototype Pollution Vulnerability"
}