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CVE record · CVE-2026-34621

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

CVSS 8.6 HighCriticalIn CISA KEVEPSS 0.072 · 94th percentile

Critical, because:

  • In CISA’s KEV catalogue since 13 Apr 2026: it is known to be exploited.

How we decide what’s critical

Published by the CVE Program (CNA: adobe) at 11 Apr 2026, 06:45 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
Adobe Acrobat DC
  • affected 26.001.21367 and earlier custom
  • unaffected 26.001.21411 custom
Other versions: unaffected
Adobe Acrobat Reader DC
  • affected 26.001.21367 and earlier custom
  • unaffected 26.001.21411 custom
Other versions: unaffected
Adobe Acrobat 2024
  • affected 24.001.30356 and earlier custom
  • unaffected 24.001.30362 (Win), 24.001.30360 (Mac) custom
Other versions: unaffected
Identifiers
CVE-2026-34621
CNA
adobe
Weakness (CWE)
CWE-1321
Tags
Published
11 Apr 2026
Updated
27 Aug 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.6 High 3.1 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H CNA (adobe)
  • CISA KEV Listed since 13 Apr 2026: known to be exploited.
  • EPSS 0.072, the 94th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 11 Apr 2026. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.