CVE-2026-34621
Adobe Acrobat and Reader Prototype Pollution Vulnerability
Published Apr 11, 2026 · updated Aug 27, 2026 · 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.
Timeline
Detection, updates, and resolution for this record.
Apr 11, 2026 · Catalog
Detected
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.
Apr 13, 2026 · CISA KEV
Known exploited
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Apr 27, 2026 · CISA KEV
Remediation due
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Aug 27, 2026 · Catalog
Updated
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.
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 due date Apr 27, 2026
Affected
- cpe adobe/acrobatversion unspecified
- cpe adobe/acrobat dcversion unspecified
- cpe adobe/acrobat reader dcversion unspecified
- vendor Adobe Acrobat and Readerversion unspecified
Sources
- CISA KEVCVE-2026-34621
Adobe Acrobat and Reader contain a prototype pollution vulnerability that allows for arbitrary code execution.
cisa.gov - CVE.orgCVE-2026-34621
Official CVE identifier
cve.org - FIRST EPSSCVE-2026-34621
30-day exploitation probability 2.2%
first.org - NIST NVDCVE-2026-34621
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
nvd.nist.gov