Adobe Acrobat and Reader Prototype Pollution Vulnerability
Adobe — Acrobat DC
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.
8.6
7.1%
Vector breakdown
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
- Published
- Apr 11, 2026
- Modified
- Aug 28, 2026
- Added to KEV
- Apr 13, 2026
- Federal patch due
- Apr 27, 2026
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.
Weakness classification
Affected packages
Proof-of-concept & exploitation references
5 foundWeaponization
Public repositories whose name or description references CVE-2026-34621, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit - cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
- azefzafyoussef/CVE-2026-34621★ 26
updated Sep 30, 2026
- NULL200OK/cve_2026_34621_advanced★ 13
A sophisticated, cross-platform exploit generator for **CVE-2026-34621** – a critical prototype pollution vulnerability in Adobe Acrobat and Reader that leads to sandbox escape and arbitrary code execution on Windows and macOS.
updated Jul 27, 2026
- ercihan/CVE-2026-34621★ 2
updated Aug 9, 2026
- ercihan/CVE-2026-34621_PDF_SAMPLE★ 1
updated Apr 17, 2026
- KeulenR01/Remediate-AdobeAcrobat-CVE-2026-34621★ 1
updated Apr 15, 2026
References
Frequently asked questions
What is CVE-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 of this issue requires user interaction in that a victim must open a malicious file.
How severe is CVE-2026-34621?
CVE-2026-34621 has a CVSS base score of 8.6 out of 10 (CVSS 3.1).
Is CVE-2026-34621 actively exploited in the wild?
Yes. CVE-2026-34621 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Apr 13, 2026, meaning CISA has confirmed evidence of active exploitation.
What is the EPSS score for CVE-2026-34621?
7.1% - meaning FIRST.org's EPSS model estimates a 7.1% probability this vulnerability will be exploited in the wild within 30 days (94% percentile among all scored CVEs).
Is there exploit tooling available for CVE-2026-34621?
We found 5 public GitHub repositories referencing CVE-2026-34621, though none matched a known Nuclei template or Metasploit module at last check. Review each one before relying on it - see the proof-of-concept section above.
What type of vulnerability is CVE-2026-34621?
CVE-2026-34621 is classified under CWE-1321 (Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (CWE-1321)).
Cross-checked against
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