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.

Adobe has patched an actively exploited zero-day in Acrobat Reader. Apply the available updates as soon as possible.

The version of Adobe Reader installed on the remote macOS host is a version prior to 26.001.21411. It is, therefore, affected by a 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. (CVE-2026-34621)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The version of Adobe Reader installed on the remote Windows host is a version prior to 26.001.21411. It is, therefore, affected by a 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. (CVE-2026-34621)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The version of Adobe Acrobat installed on the remote Windows host is a version prior to 24.001.30362 or 26.001.21411. It is, therefore, affected by a 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. (CVE-2026-34621)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The version of Adobe Acrobat installed on the remote macOS host is a version prior to 24.001.30360 or 26.001.21411. It is, therefore, affected by a 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. (CVE-2026-34621)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Type	Severity
306009	Adobe Reader < 26.001.21411 Vulnerability (APSB26-43) (macOS)	Nessus	MacOS X Local Security Checks	Local	high
306008	Adobe Reader < 26.001.21411 Vulnerability (APSB26-43)	Nessus	Windows	Local	high
306007	Adobe Acrobat < 24.001.30362 / 26.001.21411 Vulnerability (APSB26-43)	Nessus	Windows	Local	high
306006	Adobe Acrobat < 24.001.30360 / 26.001.21411 Vulnerability (APSB26-43) (macOS)	Nessus	MacOS X Local Security Checks	Local	high

Detections

Analytics

CVE-2026-34621

high

Tenable Plugins

high

high

high

high