Adobe Acrobat and Reader Prototype Pollution Vulnerability (CVE-2026-34621)
Severity: high · Patch status: unknown · Since 2026-04-13 · CVE-2026-34621
Adobe Acrobat and Reader contain a prototype pollution vulnerability that allows for arbitrary code execution. CISA added CVE-2026-34621 to its Known Exploited Vulnerabilities catalog on Apr 13, 2026, which means attackers are exploiting it in the wild.
What to do
- Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- US federal agencies must remediate by Apr 27, 2026 (BOD 22-01); treat that as the outer limit.
Sources
All live incidents on Threat Watch
