CSIRTS // UNIFIED SECURITY ADVISORY FEEDSYS ● ONLINE · POWERED BY INTELFUSIONS.COM

← Back to feed

CVE-2026-34621: Adobe Acrobat and Reader Prototype Pollution Vulnerability

criticalknown exploitedpublic exploitCVE-2026-34621
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Adobe Acrobat and Reader contain a prototype pollution vulnerability that allows for arbitrary code execution.

CSIRTS triage

vendor: Adobeproduct: Acrobat and ReaderRemote code execution
What
Adobe Acrobat and Reader contain a prototype pollution vulnerability that allows for arbitrary code execution.
Who is affected
Users of Adobe Acrobat and Reader.
Urgency
Remediation is urgent as the vulnerability is actively exploited and rated critical.
Action
Apply the latest updates for Adobe Acrobat and Reader.

AI-assisted analysis generated from the source advisory — verify against the original.

⚡ Watch Acrobat and Reader

Get an email when a new Acrobat and Reader advisory drops — max one per day, one-click unsubscribe.

Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2026-04-13
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-34621

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-34621coverage & exploitation statusNVD · CVE.org

Recent advisories for Adobe Acrobat and

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

More from CISA Known Exploited Vulnerabilities