CVE-2026-34621Acrobat Reader | Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (CWE-1321)
Updated under an hour ago ()
Does this affect you?
It affects Adobe Acrobat DC and 3 other products. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Apr 13, 2026; federal agencies had to remediate by Apr 27, 2026. Treat that date as your deadline.
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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 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
- Weakness (CWE)
- CWE-1321
- Known exploited
- Added to CISA KEV Apr 13, 2026; federal remediation due Apr 27, 2026Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- EPSS (exploitation in the next 30 days)
- 2.18% (percentile 82)
- Assigned by
- adobe
- NVD analysis
- Analyzed
- Record last updated
- Aug 27, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Adobe Acrobat DC adobe:acrobat_dc (from the name) | through 26.001.21367; 26.001.21411 not affected | CNA record |
Adobe Acrobat Reader DC adobe:acrobat_reader_dc (from the name) | through 26.001.21367; 26.001.21411 not affected | CNA record |
Adobe Acrobat 2024 adobe:acrobat_2024 (from the name) | through 24.001.30356; 24.001.30362 (Win), 24.001.30360 (Mac) not affected | CNA record |
adobe acrobat_dc adobe:acrobat_dc | before 26.001.21411 | NVD |
adobe acrobat_reader_dc adobe:acrobat_reader_dc | before 26.001.21411 | NVD |
adobe acrobat adobe:acrobat | from 24.0.0 before 24.001.30362; from 24.0.0 before 24.001.30360 | NVD |
References
- https://helpx.adobe.com/security/products/acrobat/apsb26-43.htmlvendor-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34621us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.