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Page generated: 11 Nov 2026, 02:33 UTC
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CVE-2026-34621

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…

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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 8.6 (HIGH) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE
0.0/10
REALITY · THREAT PRIORITY
8.3/10
General review priority; not probability

Evidence confidence: Exploitation recorded

Why this priority?
  • Recorded exploitation baseline: +7.00
  • Technical severity: CVSS 8.6: +1.29
  • Fresh EPSS: 7.23%: +0.04

General review priority, not probability, victim count or asset-specific risk. A range covers missing CVSS/EPSS inputs within the current evidence state.

Sources: 21 documents and public datasets.

Hype components

Headline sample (25%)
0/100
Press, 30 days (60%)
0/100
Grounded branding (15%)
0/100
HYPE TOTAL0/100

Sources and documents

Help Net Security
Press · 19 Apr 2026, 07:00 · Week in review: Acrobat Reader flaw exploited, Claude Mythos offensive capabilities and limits - Help Net Security
Rescana
Press · 16 Apr 2026, 07:00 · April 2026 Patch Tuesday: Critical Vulnerabilities in SAP, Adobe, Microsoft SharePoint, Fortinet, and ColdFusion Threaten Enterprise Security - Rescana
The Hacker News
Press · 15 Apr 2026, 07:00 · April Patch Tuesday Fixes Critical Flaws Across SAP, Adobe, Microsoft, Fortinet, and More - The Hacker News
Rescana
Press · 14 Apr 2026, 07:00 · Adobe Acrobat and Reader CVE-2026-34621: Critical Prototype Pollution Vulnerability Actively Exploited, Urgent Patch Released - Rescana
Krebs on Security
Press · 14 Apr 2026, 07:00 · Patch Tuesday, April 2026 Edition - Krebs on Security
See all 21 source documents
TechRepublic
Press · 14 Apr 2026, 07:00 · Adobe Issues Emergency Patch for Critical PDF Flaw Exploited For Months - TechRepublic
TechCrunch
Press · 14 Apr 2026, 07:00 · Adobe fixes PDF zero-day security bug that hackers have exploited for months - TechCrunch
The Register
Press · 13 Apr 2026, 07:00 · Adobe finally patches PDF pest after months of abuse - The Register
Dark Reading
Press · 13 Apr 2026, 07:00 · Adobe Patches Actively Exploited Zero-Day That Lingered for Months - Dark Reading
Help Net Security
Press · 13 Apr 2026, 07:00 · Adobe issues emergency fix for Acrobat Reader flaw exploited in the wild (CVE-2026-34621) - Help Net Security
BleepingComputer
Press · 13 Apr 2026, 07:00 · Adobe rolls out emergency fix for Acrobat, Reader zero-day flaw - BleepingComputer
Hong Kong Computer Emergency Response Team Coordination Centre
Press · 13 Apr 2026, 07:00 · Adobe Acrobat Remote Code Execution Vulnerability - Hong Kong Computer Emergency Response Team Coordination Centre
Malwarebytes
Press · 13 Apr 2026, 07:00 · Simply opening a PDF could trigger this Adobe Reader zero-day - Malwarebytes
SecurityWeek
Press · 12 Apr 2026, 07:00 · Adobe Patches Reader Zero-Day Exploited for Months - SecurityWeek
heise online
Press · 12 Apr 2026, 07:00 · Patch now! Adobe releases emergency security update for Acrobat Reader - heise online
Security Affairs
Press · 12 Apr 2026, 07:00 · Adobe fixes actively exploited Acrobat Reader flaw CVE-2026-34621 - Security Affairs
LinkedIn
Press · 12 Apr 2026, 07:00 · Adobe Reader Releases Emergency Patch For Zero-Day Vulnerability CVE-2026-34621 - LinkedIn
The Hacker News
Press · 12 Apr 2026, 07:00 · Adobe Patches Actively Exploited Acrobat Reader Flaw CVE-2026-34621 - The Hacker News
Forbes
Press · 11 Apr 2026, 07:00 · Adobe Attacks Underway—Windows And Mac Users Given 72 Hours To Update - Forbes
The Hacker News
Press · 09 Apr 2026, 07:00 · Adobe Reader Zero-Day Exploited via Malicious PDFs Since December 2025 - The Hacker News
Help Net Security
Press · 09 Apr 2026, 07:00 · Acrobat Reader zero-day exploited in the wild for many months (CVE-2026-34621) - Help Net Security

Score evolution

● Hype   ● Reality

Earlier evidence-support scores are retained in history; this chart shows only the current priority definition.

First record: hype 0.0 · reality 8.3 (2026-11-02 15:14). The curve appears once the score changes.

Public exploit evidence

0

Public exploit entries / repo candidates

Evidence context and dated references

Reality is general threat/review priority, combining observed exploitation, CVSS severity and fresh EPSS. Evidence confidence is separate. This is not calibrated risk, a victim count or an asset-specific assessment. A range reflects missing numeric inputs.

Evidence in context

Confidence in exploitation evidence
Exploitation recorded
Priority basis
Recorded exploitation; CVSS 8.6; EPSS 7.2%
Attention, last 30 days
0 distinct story titles; 0 press documents; 0 publisher domains.
Technical potential
local access, no prior privileges, user interaction.
Observed activity
Exploitation recorded in CISA KEV.
Known scale
Not quantified.
Evidence confidence basis
Trusted exploitation confirmation

Score evaluated: 2026-11-05 14:00:06.817747+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline
First press mention
09 Apr 2026, 07:00
Published
11 Apr 2026, 06:45
Added to the CISA KEV catalog
13 Apr 2026, 00:00
Latest press mention
19 Apr 2026, 07:00
Score calculated
05 Nov 2026, 14:00
Source: CVE List V5 · CISA KEV · FIRST EPSS · GitHub · RSSVulnRadar