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CVE-2026-34621 is a high severity vulnerability with a CVSS score of 8.6. Exploits are available; patches have been released and should be applied urgently. This is classified as a zero-day vulnerability.
Moderate probability of exploitation
EPSS predicts the probability of exploitation in the next 30 days based on real-world threat data, complementing CVSS severity scores with actual risk assessment.
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.
| Vendor | Product |
|---|---|
| Adobe | Acrobat |
| Adobe | Acrobat Reader Dc |
| Apple | macOS |
| Microsoft | Windows |
| Adobe | Acrobat Dc |
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