# CVE-2026-34622: Acrobat Reader | Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (CWE-1321)

CVE-2026-34622 is fixed in 2 products on 1 platform, first by Adobe Acrobat Reader DC 26.001.21431, released April 13, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-34622
- Priority: High
- CVSS: 8.6
- EPSS: 0.0042
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 14, 2026
- Weakness: CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (CWE-1321)
- Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-34622

## Description

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 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | Adobe Acrobat Reader DC | 26.001.21431 | [Adobe Acrobat Reader DC 26.001.21431](https://patchblox.com/security/data/fix/windows-app/adobe.acrobat.reader.32-bit-26.001.21431.md) | Apr 13, 2026 |
| Windows apps | Adobe Acrobat Reader DC (64-bit) | 26.001.21431 | [Adobe Acrobat Reader DC (64-bit) 26.001.21431](https://patchblox.com/security/data/fix/windows-app/adobe.acrobat.reader.64-bit-26.001.21431.md) | Apr 13, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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