CVE-2026-34621 Adobe Acrobat and Reader Prototype Pollution

What is CVE-2026-34621?

CVE-2026-34621 is a high-severity code injection vulnerability in Adobe Acrobat, published on 11 Apr 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

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.

Weakness: CWE-1321

Which versions are affected by CVE-2026-34621?

It affects 3 products.

Products include Adobe Acrobat, Adobe Acrobat Dc, Adobe Acrobat Reader Dc.

How do I fix CVE-2026-34621?

No fix has been published for CVE-2026-34621 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 27 Apr 2026.

Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.

Is CVE-2026-34621 being exploited?

Yes. Attackers have exploited CVE-2026-34621 in the wild since at least 13 Apr 2026.

Public exploit code: 5 proofs of concept on GitHub.

Other vulnerabilities in Adobe Acrobat

• CVE-2021-28550 Adobe Acrobat and Reader Use-After-Free Exploited Critical 9.6
• CVE-2021-21017 Adobe Acrobat and Reader Heap-based Buffer Overflow Exploited High 8.8
• CVE-2014-0546 Adobe Reader and Acrobat Sandbox Bypass Exploited High 8.8
• CVE-2014-0496 Adobe Reader and Acrobat Use-After-Free Exploited High 8.8
• CVE-2013-3346 Adobe Reader and Acrobat Memory Corruption Exploited High 8.8

All Adobe Acrobat vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-vcqh-932g-m3qj.