{"id":"CVE-2026-34621","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-34621","generatedAt":"2026-10-28T05:01:26.778Z","title":"Adobe Acrobat and Reader Prototype Pollution Vulnerability","description":"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.","published":"2026-04-11T07:16:04.000Z","lastModified":"2026-10-26T21:10:00.000Z","status":"Analyzed","sourceIdentifier":"psirt@adobe.com","cvss":{"version":"3.1","score":8.6,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H"},"cwe":["CWE-1321"],"affected":["adobe/acrobat dc","adobe/acrobat reader dc","adobe/acrobat"],"epss":{"score":0.0723,"percentile":0.94292,"date":"2026-10-27","history":[{"date":"2026-09-24","score":0.02183,"percentile":0.81588},{"date":"2026-10-25","score":0.0723,"percentile":0.94281}]},"kev":{"listed":true,"dateAdded":"2026-04-13","dueDate":"2026-04-27","knownRansomwareCampaignUse":"Unknown","notes":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.\nhttps://helpx.adobe.com/security/products/acrobat/apsb26-43.html ; https://nvd.nist.gov/vuln/detail/CVE-2026-34621"},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"Known to be exploited in the wild (CISA KEV, CISA remediation deadline 27 April 2026). Treat as an emergency change: patch or isolate now, then hunt for prior compromise."},"changes":[{"kind":"epss","label":"EPSS jump","at":"2026-10-25T00:00:00.000Z","detail":{"to":0.0723,"from":0.02183,"percentile":0.94281},"summary":"EPSS moved from 2.2% to 7.2% probability of exploitation in the next thirty days."}],"references":[{"url":"https://helpx.adobe.com/security/products/acrobat/apsb26-43.html","tags":["Vendor Advisory"],"source":"psirt@adobe.com"},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34621","tags":["US Government Resource"],"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-34621","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}