CVE-2026-34621
High 8.6 Exploited in the wild (KEV)
Confirmed active exploitation — CISA KEV catalog
- Name
- Adobe Acrobat and Reader Prototype Pollution Vulnerability
- Added to catalog
- Remediation due date (US federal)
- 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.
Description
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
- CVSS 3.1
-
8.6 (HIGH)
Score source: CNA
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H - EPSS — exploit probability
- 7% (percentile: 94) as of 1 November 2026
- CWE
- CWE-1321
Affected products
adobe: acrobat dc; adobe: acrobat reader dc; apple: macos; microsoft: windows; adobe: acrobat
References
- https://helpx.adobe.com/security/products/acrobat/apsb26-43.html Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026… US Government Resource