CVE-2026-34621
Acrobat Reader | Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (CWE-1321)
Adobe Acrobat and Reader Prototype Pollution Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.
Required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CISA notes
https://helpx.adobe.com/security/products/acrobat/apsb26-43.html ; https://nvd.nist.gov/vuln/detail/CVE-2026-34621
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.
Severity
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:HAffected Products
| Vendor | Product | Affected versions |
|---|---|---|
| Adobe | Acrobat DC | 0 to 26.001.21367 26.001.21411 (unaffected) |
| Adobe | Acrobat Reader DC | 0 to 26.001.21367 26.001.21411 (unaffected) |
| Adobe | Acrobat 2024 | 0 to 24.001.30356 24.001.30362 (Win), 24.001.30360 (Mac) (unaffected) |
References
1 LinksRecord Details
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