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CVE-2026-34621

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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:cc071e951c66c4ff305ac2b689e038654bf767b58b21c86935bbb788b8bf05ca
Known exploited
CISA KEV
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"defaultStatus":"affected","product":"Acrobat Reader","vendor":"Adobe","versions":[{"lessThanOrEqual":"26.001.21367","status":"affected","version":"0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a54fe6b2a371df99563fba3c65319de412dc7e872cb8a94401dd36c4da3bedb9 · sha256:3abc32b2374f8083… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","availabilityRequirement":"NOT_DEFINED","baseScore":8.6,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","confidentialityRequirement":"NOT_DEFINED","environmentalScore":8.6,"environmentalSeverity":"HIGH","exploitCodeMaturity":"NOT_DEFINED","integrityImpact":"HIGH","integrityRequirement":"NOT_DEFINED","modifiedAttackComplexity":"LOW","modifiedAttackVector":"LOCAL","modifiedAvailabilityImpact":"HIGH","modifiedConfidentialityImpact":"HIGH","modifiedIntegrityImpact":"HIGH","modifiedPrivilegesRequired":"NONE"…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:a54fe6b2a371df99563fba3c65319de412dc7e872cb8a94401dd36c4da3bedb9 · sha256:3abc32b2374f8083… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-1321","description":"Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (CWE-1321)","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a54fe6b2a371df99563fba3c65319de412dc7e872cb8a94401dd36c4da3bedb9 · sha256:3abc32b2374f8083… · /containers/cna/problemTypes/0/descriptions/0

Known exploitation assertions

2 source assertions
{"cwes":["CWE-1321"],"dateAdded":"2026-04-13","dueDate":"2026-04-27","knownRansomwareCampaignUse":"Unknown","notes":"https://helpx.adobe.com/security/products/acrobat/apsb26-43.html ; https://nvd.nist.gov/vuln/detail/CVE-2026-34621","product":"Acrobat and Reader","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","shortDescription":"Adobe Acrobat and Reader contain a prototype pollution vulnerability that allows for arbitrary code execution.","vendorProject":"Ad…
  • cisa_kev_jsonknown_exploited
    urn:baitaphish:normalized-source-record:v2:a59460c6c7ae8d82d2f54e7a096732c92f6ac0516f2a9cb0a762a87a4cfb15cb · sha256:16acee8334e59e44… · /vulnerabilities/97
    Open source location →
{"cwes":["CWE-1321"],"dateAdded":"2026-04-13","dueDate":"2026-04-27","knownRansomwareCampaignUse":"Unknown","notes":"https://helpx.adobe.com/security/products/acrobat/apsb26-43.html ; https://nvd.nist.gov/vuln/detail/CVE-2026-34621","product":"Acrobat and Reader","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","shortDescription":"Adobe Acrobat and Reader contain a prototype pollution vulnerability that allows for arbitrary code execution.","vendorProject":"Ad…
  • cisa_kev_jsonknown_exploited
    urn:baitaphish:normalized-source-record:v2:89e51f2e3c6567365c3bb8a701697df0a8f0bc55dd7c367e66982b44468a3551 · sha256:635dff916c4092c0… · /vulnerabilities/100
    Open source location →

Source references

2 source assertions
{"tags":["vendor-advisory"],"url":"https://helpx.adobe.com/security/products/acrobat/apsb26-43.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a54fe6b2a371df99563fba3c65319de412dc7e872cb8a94401dd36c4da3bedb9 · sha256:3abc32b2374f8083… · /containers/cna/references/0
{"tags":["government-resource"],"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34621"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a54fe6b2a371df99563fba3c65319de412dc7e872cb8a94401dd36c4da3bedb9 · sha256:3abc32b2374f8083… · /containers/adp/0/references/0

Attribution and limitations

  • CISA Known Exploited Vulnerabilities JSON: CISA named for provenance; do not use CISA/DHS marks or imply endorsement Source →
  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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