{"id":"CVE-2026-34621","aliases":["EUVD-2026-21675","GHSA-vcqh-932g-m3qj"],"status":"published","title":"Acrobat Reader | Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (CWE-1321)","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.","severity":{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.0734,"percentile":0.94478,"model":"v2026.06.15"},"facts":{"in_kev":true,"known_exploited":true,"public_exploit":true,"fix_available":false},"cwes":["CWE-1321"],"published":"2026-04-11T06:45:43Z","modified":"2026-10-26T21:10:00Z","kev":{"date_added":"2026-04-13","due_date":"2026-04-27","required_action":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","known_ransomware_use":"Unknown"},"exploitation":[{"source":"euvd","since":"2026-04-13"},{"source":"kev","since":"2026-04-13"}],"exploits":[{"source":"pocgithub","id":"ercihan/CVE-2026-34621","title":"ercihan/CVE-2026-34621","date":"2026-04-13","url":"https://github.com/ercihan/CVE-2026-34621"},{"source":"pocgithub","id":"KeulenR01/Remediate-AdobeAcrobat-CVE-2026-34621","title":"KeulenR01/Remediate-AdobeAcrobat-CVE-2026-34621","date":"2026-04-14","url":"https://github.com/KeulenR01/Remediate-AdobeAcrobat-CVE-2026-34621"},{"source":"pocgithub","id":"NULL200OK/cve_2026_34621_advanced","title":"NULL200OK/cve_2026_34621_advanced","date":"2026-04-15","url":"https://github.com/NULL200OK/cve_2026_34621_advanced"},{"source":"pocgithub","id":"ercihan/CVE-2026-34621_PDF_SAMPLE","title":"ercihan/CVE-2026-34621_PDF_SAMPLE","date":"2026-04-17","url":"https://github.com/ercihan/CVE-2026-34621_PDF_SAMPLE"},{"source":"pocgithub","id":"azefzafyoussef/CVE-2026-34621","title":"azefzafyoussef/CVE-2026-34621","date":"2026-05-12","url":"https://github.com/azefzafyoussef/CVE-2026-34621"}],"products":[{"vendor":"adobe","product":"acrobat"},{"vendor":"adobe","product":"acrobat 2024"},{"vendor":"adobe","product":"acrobat and reader"},{"vendor":"adobe","product":"acrobat dc"},{"vendor":"adobe","product":"acrobat reader dc"},{"vendor":"adobe","product":"acrobat_dc"},{"vendor":"adobe","product":"acrobat_reader_dc"}],"references":[{"url":"https://helpx.adobe.com/security/products/acrobat/apsb26-43.html","tags":["vendor-advisory","Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34621","tags":["government-resource","US Government Resource"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34621"},{"url":"https://github.com/advisories/GHSA-vcqh-932g-m3qj"}],"sources":{"cve":[{"id":"CVE-2026-34621","title":"Acrobat Reader | Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (CWE-1321)","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. 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Exploitation of this issue requires user interaction in that a victim must open a malicious file.","status":"published","published":"2026-04-11T06:45:43Z","modified":"2026-08-27T22:15:48Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"high"}],"exploited_since":"2026-04-13","updated_at":"2026-11-02T18:01:25.95978Z"}],"ghsa":[{"id":"GHSA-vcqh-932g-m3qj","title":"Acrobat Reader versions 24.001.30356, 26.001.21367 and earlier are affected by an Improperly...","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.","status":"published","published":"2026-04-11T09:30:27Z","modified":"2026-04-13T18:31:44Z","cvss":[{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T15:07:26.169567Z"}],"kev":[{"id":"CVE-2026-34621","title":"Adobe Acrobat and Reader Prototype Pollution Vulnerability","description":"Adobe Acrobat and Reader contain a prototype pollution vulnerability that allows for arbitrary code execution.","cwes":["CWE-1321"],"kev":{"date_added":"2026-04-13","due_date":"2026-04-27","required_action":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","known_ransomware_use":"Unknown"},"updated_at":"2026-11-02T17:00:15.999436Z"}],"nvd":[{"id":"CVE-2026-34621","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.","status":"published","published":"2026-04-11T07:16:03.633Z","modified":"2026-10-26T21:10:00.17Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T14:12:14.37744Z"}]}}