# CVE-2026-34621: Acrobat Reader | Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (CWE-1321)

> CVE-2026-34621: Acrobat Reader | Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (CWE-1321). CVSS 8.6 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2026-34621
Last updated: 2026-08-28T00:17:16Z

- Published: 2026-04-11 06:45 UTC · Updated: 2026-08-28 00:17 UTC · Assigner: adobe
- CVSS: 8.6 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
- EPSS: 7.2%, 94th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2026-04-13, federal due date 2026-04-27, ransomware use: Unknown
- CWE: CWE-1321

## 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.

## CISA 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.

## Affected vendors and products

- Adobe: Acrobat 2024
- Adobe: Acrobat DC
- Adobe: Acrobat Reader DC

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-34621)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-34621)
- [https://helpx.adobe.com/security/products/acrobat/apsb26-43.html](https://helpx.adobe.com/security/products/acrobat/apsb26-43.html)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-34621 · Markdown: https://rewindex.com/cve/CVE-2026-34621.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-34621 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:13:07.564Z