CVE-2026-34621
Acrobat Reader | Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (CWE-1321)
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.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Acrobat Reader | Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (CWE-1321)
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.
- Record
CVE-2026-34621- CVSS 3.1
- 8.6 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H - Weakness
- CWE-1321
- Updated
- 2026-11-02
EUVDEUVD-2026-21675
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.
- Record
EUVD-2026-21675- CVSS 3.1
- 8.6 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-vcqh-932g-m3qj
Acrobat Reader versions 24.001.30356, 26.001.21367 and earlier are affected by an Improperly...
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.
- Record
GHSA-vcqh-932g-m3qj- CVSS 3.1
- 9.6 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H - Weakness
- CWE-1321
- Updated
- 2026-11-02
CISA KEV No score
Adobe Acrobat and Reader Prototype Pollution Vulnerability
Adobe Acrobat and Reader contain a prototype pollution vulnerability that allows for arbitrary code execution.
- Record
CVE-2026-34621- Weakness
- CWE-1321
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-34621- CVSS 3.1
- 8.6 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H - Weakness
- CWE-1321
- Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | ercihan/CVE-2026-34621 | 2026-04-13 |
| PoC in GitHub | KeulenR01/Remediate-AdobeAcrobat-CVE-2026-34621 | 2026-04-14 |
| PoC in GitHub | NULL200OK/cve_2026_34621_advanced | 2026-04-15 |
| PoC in GitHub | ercihan/CVE-2026-34621_PDF_SAMPLE | 2026-04-17 |
| PoC in GitHub | azefzafyoussef/CVE-2026-34621 | 2026-05-12 |
History
| Recorded | Changed | Sources |
|---|---|---|
| exploitation, exploits | ||
| first indexed | CVE List, EUVD, GitHub Advisories, CISA KEV, NVD, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-34621 is a high vulnerability (CVSS 8.6) in Adobe Acrobat, published April 11, 2026. CISA lists it as known to be exploited, since April 13, 2026. EUVD reports exploitation since April 13, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 7.23%, the 94th percentile. No source names a fixed version.