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CVE-2026-34621

Adobe Acrobat and Reader Prototype Pollution

8.6 HIGHActively exploited (CISA KEV)EPSS 2.18%
  1. Published11 Apr 2026
  2. Added to CISA KEV13 Apr 2026
  3. Remediation due27 Apr 2026
Actively exploited (CISA KEV)

Adobe Acrobat and Reader contain a prototype pollution vulnerability that allows for arbitrary code execution.

Added to KEV: 13 Apr 2026Federal remediation due: 27 Apr 2026

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.

CVSS 3.1 breakdown

Attack vectorLocal
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Affected products

Adobe Acrobat≥ 24.0.0 < 24.001.30360 · ≥ 24.0.0 < 24.001.30362
Adobe Acrobat Dc< 26.001.21411
Adobe Acrobat Reader Dc< 26.001.21411

Remediation

Fixed in
Adobe Acrobat≥ 24.001.30360
Adobe Acrobat Dc≥ 26.001.21411
Adobe Acrobat Reader Dc≥ 26.001.21411

References

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Frequently asked

Is CVE-2026-34621 being actively exploited?

Yes. CVE-2026-34621 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 13 Apr 2026.

How severe is CVE-2026-34621?

CVE-2026-34621 has a CVSS 3.1 base score of 8.6, rated high. EPSS estimates a 2.18% probability of exploitation.

Which products are affected by CVE-2026-34621?

Affected products include Adobe Acrobat, Adobe Acrobat Dc, Adobe Acrobat Reader Dc.

How do I fix CVE-2026-34621?

Upgrade affected software to a fixed version, for example Adobe Acrobat 24.001.30360, Adobe Acrobat Dc 26.001.21411, Adobe Acrobat Reader Dc 26.001.21411 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-34621 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.