Strix
26.1K

CVE-2026-34621

HIGHCVSS 8.6/10Actively ExploitedEPSS 7.09%

Last modified

CVE-2026-34621 is a high-severity vulnerability rated 8.6/10 on the CVSS scale. 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 has confirmed active exploitation in the wild. EPSS estimates a 7.09% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
8.6/10

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

EPSS Probability
7.09%

93.4th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by .

Weakness Enumeration

Affected Software

VendorProductVersions
AdobeAcrobat Dc< 26.001.21411
AdobeAcrobat Reader Dc< 26.001.21411
AdobeAcrobat>= 24.0.0, < 24.001.30362
AdobeAcrobat>= 24.0.0, < 24.001.30360

References

Timeline

Published
Last Modified
Status
Analyzed

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 score of 8.6/10 (HIGH severity). The EPSS model estimates a 7.09% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.
How do I fix CVE-2026-34621?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-34621?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST