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CVE-2026-34621

is CVE-2026-34621real, exploitable, or a false positive? Here's the community ground truth.

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High · CVSS 8.6EPSS 7.1%CISA KEVCWE-1321

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

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.

References

NVD MITRE CVE.org CISA KEV

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Community ground truth

Community verdict

3 verdicts
Not a real issue

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Community real-world severity: High (High 3) — CVSS base score 8.6

In line with its CVSS base score.

Field notes & remediation

Verdicts are the quick signal — notes are the evidence and fixes behind them.

  • 0
    Field note · Hanna BergCurated

    Adobe Acrobat and Reader Prototype Pollution Vulnerability — Adobe Acrobat and Reader contain a prototype pollution vulnerability that allows for arbitrary code execution. Listed in the CISA KEV catalog (added 2026-04-13) — confirmed exploited in the wild, not theoretical. FIRST EPSS puts the chance of exploitation in the next 30 days at ~7%. Treat it as real and prioritize remediation over triage.

  • 0
    Remediation · Sam WhitakerCurated

    Required action for Adobe Acrobat and Reader: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. CISA set a federal remediation due date of 2026-04-27. After patching, verify the vulnerable path is no longer reachable before closing the finding.