[KEV] Vulnerability in Adobe acrobat-and-reader (CVE-2026-34621)
Summary
vulnerability in Adobe acrobat-and-reader (CVE-2026-34621). Risk of unauthorized operations or information disclosure. Listed in CISA KEV — actively exploited.
Original description
The description as published by the source.
Adobe Acrobat and Reader contain a prototype pollution vulnerability that allows for arbitrary code execution.
AI summary
Written by an external AI model and may contain mistakes. Check the original description and references below before acting on it.
A vulnerability in Adobe Acrobat and Reader allows attackers to execute malicious code using a specific technique. This vulnerability is exploitable remotely, posing a risk to organizational data. Similar techniques have caused significant damage in the past, making timely updates crucial. It is also noted in CISA's list, highlighting the urgency for mitigation.
The vulnerability in Adobe Acrobat and Reader involves "Prototype Pollution" allowing arbitrary code execution. This can be exploited remotely with no authentication required. Specific affected versions and endpoints were not identified, but prompt application of fixes is critical. As a workaround, a specific setting could disable certain scripts, though exact values could not be determined from the material. The vulnerability is listed on CISA's KEV, indicating a heightened level of concern.
Adobe Acrobat and Reader contain a prototype pollution vulnerability allowing for arbitrary code execution.
The affected components or functions are not specified in the available material.
High severity as it allows remote code execution with no authentication required.
Implement the latest security patches released by Adobe.
Specific script disabling settings are suggested but not detailed in the available information.
No specific detection methods provided in the available material.
Related past incidents Similar incidents extracted from past CVEs
Exchange Server vulnerability allowing RCE via crafted requests.
Exploited SMB vulnerability leading to large scale ransomware attack.
VBScripting engine vulnerability leading to remote code execution.
If this happens at your company Expected impact per business scenario
顧客データが盗まれ、セキュリティ侵害が公になる可能性がある。
企業秘密や内部データが漏洩し、業績に影響が及ぶ。
サービス停止や顧客の信頼失墜へと繋がるリスクがある。
Adobeのアップデートを即時適用し、既知の悪用手法への対策を実施することが重要です。
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'acrobat-and-reader' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
acrobat-and-readerを grep し、稼働しているサービス・バージョンを把握する。 -
4Consider incident declaration escalate
Notify SOC / on-callCISA KEV登録済 = 実環境で悪用が観測されている。Step 3 で兆候があればインシデント対応宣言、無くてもパッチ適用までWAF強化を最優先で。
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7Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番では Step 3 と同じログクエリでアラート再発が無いか継続監視。
References
- advisory NVD
- patch psirt@adobe.com
- web cisa.gov