Vulnerability

CVE-2026-34621

High· 8.6KEVCVSS8.6EPSS11%

.rules3/5

Adobe Acrobat and Reader Prototype Pollution Vulnerability

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

Threat signal

98/100

Severe

Severity

high

CVSS

8.6

EPSS

11%

Active

KEV

CISA KEV — actively exploited

47d overdue

AffectedAdobe — Acrobat and Reader

Added to KEV

2026-04-13

Federal patch due (BOD 22-01)

2026-04-27

Required action (CISA verbatim)

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 advisory + references

CISA description: “Adobe Acrobat and Reader contain a prototype pollution vulnerability that allows for arbitrary code execution.”

CVSS

v3.1Open in FIRST calculator →

8.6/ 10HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Attack VectorLocalRequires local access — shell, console, or local app.
Attack ComplexityLowNo special conditions — exploit works reliably.
Privileges RequiredNoneUnauthenticated — no credentials needed.
User InteractionRequiredRequires user action (click, file open, etc).
ScopeChangedImpact extends beyond the vulnerable component (e.g. sandbox escape).
Confidentiality ImpactHighTotal disclosure of sensitive data.
Integrity ImpactHighTotal compromise of integrity — full data modification possible.
Availability ImpactHighTotal loss of availability — full DoS possible.

EPSS

Exploit prediction · 30-day horizonFIRST.org →

11.0%

probability of exploitation in next 30 days

p94

higher than 94% of all CVEs

3-day trend↑ 0pp

Above the FIRST 'patch on a priority schedule' threshold.

Vendor VEX

No VEX statements published for CVE-2026-34621. Vendors publish VEX (Vulnerability Exploitability eXchange) to assert per-product whether a CVE is actually exploitable in their distribution.

SSVCAct

Active exploitation with total impact on essential/support systems

exploitation: active
automatable: yes
impact: total
mission: support

Lifecycle

2026-04-13Added to CISA KEVransomware: Unknown
2026-04-13Published
2026-04-14Mentioned in rss:krebsPatch Tuesday, April 2026 Edition
2026-04-27Federal patch due (BOD 22-01)
2026-06-12Last modified1 source

Entity graph

2 nodes · 1 edges · click to pivot

CVEActorVendor advisoryIOCNews

Mentions in news & research

rss:krebsPatch Tuesday, April 2026 Edition2026-04-14

No source-event history recorded yet. New revisions will appear here as ingestors re-fetch this CVE.