Adobe Acrobat Reader up to 24.001.30360/24.001.30362/26.001.21411 File prototype pollution

Summaryinfo

A vulnerability identified as problematic has been detected in Adobe Acrobat Reader up to 24.001.30360/24.001.30362/26.001.21411. Impacted is an unknown function of the component File Handler. This manipulation causes prototype pollution. This vulnerability appears as CVE-2026-34626. The attack may be initiated remotely. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in Adobe Acrobat Reader up to 24.001.30360/24.001.30362/26.001.21411. Affected by this vulnerability is some unknown functionality of the component File Handler. The manipulation with an unknown input leads to a prototype pollution vulnerability. The CWE definition for the vulnerability is CWE-1321. The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype. As an impact it is known to affect confidentiality. The summary by CVE is:

Acrobat Reader versions 26.001.21411, 24.001.30360, 24.001.30362 and earlier are affected by an Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') vulnerability that could result in arbitrary file system read in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.

The advisory is shared at helpx.adobe.com. This vulnerability is known as CVE-2026-34626 since 03/30/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 04/14/2026). MITRE ATT&CK project uses the attack technique T1059 for this issue.

Upgrading eliminates this vulnerability.

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Productinfo

Type

• Document Reader Software

Vendor

• Adobe

Name

• Acrobat Reader

Version

• 24.001.30360
• 24.001.30362
• 26.001.21411

License

• free

Website

• Vendor: https://www.adobe.com/

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