CVE-2026-34621
high CISA KEVAdobe Acrobat and Reader Prototype Pollution Vulnerability
Vendor / product: Adobe — Acrobat and Reader
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.
CVSS
8.6
8.6 (CVSS v3.1)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H Severity source: NVD CVSS v3.1 (psirt@adobe.com)
Timeline (UTC)
Published: 2026-04-11 07:16
Modified: 2026-10-26 21:10
NVD status: Analyzed
Last synced 1 day ago
Verified against the source API 2026-10-27 07:07 UTC
Exploitation
Listed in CISA KEV
Added 2026-04-13 · due 2026-04-27
Known ransomware use: Unknown
Required action (CISA)
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected products
adobe / acrobat_dc <26.001.21411
adobe / acrobat_reader_dc <26.001.21411
adobe / acrobat ≥24.0.0 <24.001.30362, ≥24.0.0 <24.001.30360
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Vendor advisory: https://helpx.adobe.com/security/products/acrobat/apsb26-43.html
References
- https://helpx.adobe.com/security/products/acrobat/apsb26-43.html psirt@adobe.com
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34621 134c704f-9b21-4f2e-91b3-4a467353bcc0
Data sources
CISA KEV — fetched 2026-10-27 06:50 UTC · record ↗
NVD CVE API 2.0 — fetched 2026-10-27 07:07 UTC · record ↗