CVE-2026-34621 KEV
8.6
HIGH · CVSS 3.1 · EPSS 2.2% (pctl 82)
Patch first
On CISA KEV — known exploited in the wild, due 2026-04-27.
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.
Scoring
| CVSS | 8.6 (HIGH, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H |
| EPSS | 2.18% — more likely to be exploited than 82% of all CVEs |
| Weakness | CWE-1321 |
| On CISA KEV | yes — remediate by 2026-04-27 |
| Public exploit | none known |
| Published | 2026-04-11 |
| Last modified | 2026-08-28 |
CISA KEV
| Name | Adobe Acrobat and Reader Prototype Pollution Vulnerability |
|---|---|
| Added | 2026-04-13 |
| Due | 2026-04-27 |
| Vendor / product | Adobe / Acrobat and Reader |
| Ransomware use | none reported |
Affected (5)
| Vendor | Product |
|---|---|
| adobe | acrobat |
| adobe | acrobat dc |
| adobe | acrobat reader dc |
| apple | macos |
| microsoft | windows |
References
→ the Explorer · watch your stack · NVD