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Fencer Vulns
high 8.6

CVE-2026-34621 kev in the critical feed json

Acrobat Reader | Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (CWE-1321)

published 2026-04-11 6 mo ago modified 2026-10-26 13 d ago also EUVD-2026-21675

cvss
8.6
version 3.1, CNA
cisa kev
Exploited
added 2026-04-13
epss
7.3%
EPSS 7.3% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

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.

Patch / fix

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.

  • Adobe Acrobat DC 26.001.21411
  • Adobe Acrobat Reader DC 26.001.21411
  • Adobe Acrobat 2024 24.001.30362 (Win), 24.001.30360 (Mac)

Timeline

  1. CISA SSVC: exploitation active
  2. Published
  3. 0-day patched (Project Zero)
  4. Added to CISA KEV
  5. CISA patch deadline

Known exploited

Added
6 mo ago
Patch by
2026-04-27 (6 mo ago)
Ransomware
Not known
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.
Vendor, product
Adobe, Acrobat and Reader
CISA name
Adobe Acrobat and Reader Prototype Pollution Vulnerability

Zero-day

Detected in real attacks while still unknown to the vendor and the public, per Google Project Zero's 0day In-the-Wild tracker.

Patched
2026-04-12
Details
project zero tracker

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
no
Technical impact
total
Assessed
6 mo ago

Exploit prediction

7.34% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.6 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Affected products

  • Adobe Acrobat DC
  • Adobe Acrobat Reader DC
  • Adobe Acrobat 2024

Classification

Weakness
  • CWE-1321 Improperly Controlled Modification of Object Prototype Attributes

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.