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CVE-2026-34621: Adobe Acrobat and Reader Prototype Pollution Vulnerability

• Severity: high (CVSS 8.6 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2026-04-13
• EPSS: 7.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-11 · updated 2026-10-26
• Weakness: CWE-1321

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.

Affected products

• Adobe Acrobat for Edge: from 24.0.0 before 24.001.30362; from 24.0.0 before 24.001.30360 — fixed in 24.001.30362, 24.001.30360
• Adobe Acrobat DC: before 26.001.21411 — fixed in 26.001.21411
• Adobe Acrobat Reader: before 26.001.21411 — fixed in 26.001.21411

How to fix

Upgrade to a fixed version: Adobe Acrobat for Edge 24.001.30362, 24.001.30360; Adobe Acrobat DC 26.001.21411; Adobe Acrobat Reader 26.001.21411. Check the vendor advisory for mitigations.

References

• https://helpx.adobe.com/security/products/acrobat/apsb26-43.html
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34621

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