Home/CVE/Adobe Acrobat and Reader Prototype Pollution Vulnerability
CVE

CVE-2026-34621

Adobe Acrobat and Reader Prototype Pollution Vulnerability

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.

HIGH · CVSS 8.6 ⚠ CISA KEV EPSS 0.09811
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  • Listed on CISA KEV (known exploited in the wild)
  • SSVC exploitation status: active
  • EPSS percentile: top 7% of all CVEs by exploitation likelihood
  • CVSS base score ≥ 7.0
Sigma rules15 YARA rules0
⬢

Required Remediation

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

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Weakness Classification

CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
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Affected Products & Versions

4
adobe acrobat dc< 26.001.21411
adobe acrobat reader dc< 26.001.21411
adobe acrobat>= 24.0.0 and < 24.001.30362
adobe acrobat>= 24.0.0 and < 24.001.30360
◈

Sigma Hunt Rules

15
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
producthighSuspicious Microsoft Office Child Process - MacOS
producthighRemote Access Tool - Renamed MeshAgent Execution - MacOS
producthighBinary Padding - MacOS
productmediumSuspicious Execution via macOS Script Editor
productmediumSystem Information Discovery Via Sysctl - MacOS
productmediumNew File Exclusion Added To Time Machine Via Tmutil - MacOS
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Scoring & Timeline

8.6
HIGH · CVSS v3.1 · psirt@adobe.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD11 Apr 2026 · 07:16 AM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
active
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
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Vendor Advisories

2
cisaKEV-CVE-2026-34621
adobe-psirtAPSB26-43
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34621US Government Resource
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