CVE-2026-34621
KEVAdobe Acrobat and Reader Prototype Pollution Vulnerability
Description
Adobe Acrobat and Reader contain a prototype pollution vulnerability that allows for arbitrary code execution.
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.
CVSS 3.1 vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:HPublishedApr 11, 2026
Last modifiedOct 26, 2026
Added to KEVApr 13, 2026
Remediation dueApr 27, 2026
References
- helpx.adobe.com/security/products/acrobat/apsb26-43.htmlVendor Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34621US Government Resource
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Risk assessment · High
Actively exploited. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 184 days
- CVSS
- 8.6 HIGH
- EPSS (30-day exploit probability)
- 7.2% · top 6% of all CVEs
- Weakness
- CWE-1321
Recommended actions
- 1.Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.