Adobe Acrobat and Reader Prototype Pollution Vulnerability

[ Why it matters ]Priority signals

• Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2026-04-13

[ Description ]Official 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.

CISA: Adobe Acrobat and Reader contain a prototype pollution vulnerability that allows for arbitrary code execution.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 27 Apr 2026): Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• helpx.adobe.com/security/products/acrobat/apsb26-43.htmlVendor Advisory
• www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource