CVE-2026-34621
HighExploitedPublic exploitAcrobat 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.
Published Apr 14, 2026 · Updated Aug 28, 2026 · Also known as TR-26-0102
Key Facts
Patch immediately- CVE-2026-34621 is a high-severity vulnerability (CVSS 8.6 v3.1) affecting Acrobat (Adobe), Acrobat DC (Adobe), Acrobat Reader DC (Adobe) and 2 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Apr 7, 2026. Public exploit code is available.
- EPSS estimates a 2.2% probability of exploitation in the next 30 days.
- Fixed versions are available, including Acrobat 24.001.30360, Acrobat 24.001.30362, Acrobat DC 26.001.21411.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
8.6
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
2.2%
Higher than 82.0% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
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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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Apr 13, 2026 | Apr 27, 2026 | Not reported |
| Industry KEV feed | Apr 7, 2026 | Apr 27, 2026 | Not reported |
| CIRCL KEV | Apr 13, 2026 | Apr 27, 2026 | Not reported |
| ENISA EUVD | Apr 13, 2026 | n/a | Not reported |
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 Products
7 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| AcrobatAdobe | See advisory | 24.001.30362 |
| Acrobat DCAdobe | See advisory | 26.001.21411 |
| Acrobat Reader DCAdobe | See advisory | 26.001.21411 |
| Acrobat 2024 | See advisory | n/a |
| Acrobat Reader | See advisory | n/a |
Patched Releases
Acrobat
24.001.30360, 24.001.30362
Acrobat DC
26.001.21411
Acrobat Reader DC
26.001.21411
Timeline
Added to Industry KEV feed
Apr 7, 2026
Added to CISA KEV
Apr 13, 2026
Added to CIRCL KEV
Apr 13, 2026
Added to ENISA EUVD
Apr 13, 2026
Publicly disclosed
Apr 14, 2026
Last updated
Aug 28, 2026
Weakness Type
- CWE-1321 Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
References
- advisoryVulnCheck exploitation report
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2026-34621
- advisoryUSOM advisory
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
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.
Affected: Acrobat (Adobe); Acrobat DC (Adobe); Acrobat Reader DC (Adobe), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Apr 7, 2026.
Yes. It was added on Apr 13, 2026 with a federal remediation due date of Apr 27, 2026.
Public exploit code is available.
Fixed versions are available, including Acrobat 24.001.30360, Acrobat 24.001.30362, Acrobat DC 26.001.21411.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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