Acrobat Reader | Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (CWE-1321)
Priority CRITICAL 96Exploited in the wildCWE-1321Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
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.
Why it matters now
Exploitation Active In CISA KEV since 2026-04-13CISA due date 2026-04-27
EPSS 0.0723 94th percentileScored 2026-11-07
Fix Fixed Acrobat DC (Adobe): 26.001.21411Acrobat Reader DC (Adobe): 26.001.21411+1 more product
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Active
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Adobe | Acrobat DC | up to 26.001.21367 | 26.001.21411 | Patch available | CNA |
| Adobe | Acrobat Reader DC | up to 26.001.21367 | 26.001.21411 | Patch available | CNA |
| Adobe | Acrobat 2024 | up to 24.001.30356 | 24.001.30362 (Win), 24.001.30360 (Mac) | Patch available | CNA |
- Acrobat DC VendorAdobe Affected up to 26.001.21367 Fixed in 26.001.21411 Patch available CNA
- Acrobat Reader DC VendorAdobe Affected up to 26.001.21367 Fixed in 26.001.21411 Patch available CNA
- Acrobat 2024 VendorAdobe Affected up to 24.001.30356 Fixed in 24.001.30362 (Win), 24.001.30360 (Mac) Patch available CNA
CPE configurations NVD · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:adobe:acrobat_dc:*:*:*:*:continuous:*:*:* | before 26.001.21411 | Vulnerable | Adobe |
| cpe:2.3:a:adobe:acrobat_reader_dc:*:*:*:*:continuous:*:*:* | before 26.001.21411 | Vulnerable | Adobe |
| cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Apple |
| cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Microsoft |
| cpe:2.3:a:adobe:acrobat:*:*:*:*:classic:*:*:* | 24.0.0 to before 24.001.30362; 24.0.0 to before 24.001.30360 | Vulnerable | Adobe |
- cpe:2.3:a:adobe:acrobat_dc:*:*:*:*:continuous:*:*:* Versions before 26.001.21411 Vulnerable ·Adobe
- cpe:2.3:a:adobe:acrobat_reader_dc:*:*:*:*:continuous:*:*:* Versions before 26.001.21411 Vulnerable ·Adobe
- cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Apple
- cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft
- cpe:2.3:a:adobe:acrobat:*:*:*:*:classic:*:*:* Versions 24.0.0 to before 24.001.30362; 24.0.0 to before 24.001.30360 Vulnerable ·Adobe
Remediation
- Fix · CNA Acrobat DC (Adobe) Fixed in 26.001.21411
- Fix · CNA Acrobat Reader DC (Adobe) Fixed in 26.001.21411
- Fix · CNA Acrobat 2024 (Adobe) Fixed in 24.001.30362 (Win), 24.001.30360 (Mac)
Timeline
- 2026-04-13 Added to CISA KEV
- 2026-10-02 Threatist record created from CVE-2026-34621
- 2026-10-03 Alias added: GHSA-vcqh-932g-m3qj
- 2026-10-25 EPSS moved to the 90th–95th percentile
References
More Adobe Acrobat vulnerabilities
- TI-2014-00524 Adobe Reader and Acrobat 10.x before 10.1.11 and 11.x before 11.0.08 on Windows allow… KEVCVSS 3.1CRITICAL 9.8
- TI-2013-02915 Adobe Reader and Acrobat 9.x before 9.5.5, 10.x before 10.1.7, and 11.x before 11.0.03… KEVCVSS 3.1CRITICAL 9.8
- TI-2013-02389 Integer overflow in Adobe Reader and Acrobat 9.x before 9.5.5, 10.x before 10.1.7, and… KEVCVSS 3.1CRITICAL 9.8
- TI-2011-02156 Unspecified vulnerability in the U3D component in Adobe Reader and Acrobat 10.1.1 and… KEVCVSS 3.1CRITICAL 9.8
- TI-2021-09626 Adobe Acrobat Reader use after free vulnerability could lead to arbitrary code execution KEVCVSS 3.1HIGH 8.8
- TI-2021-04123 Acrobat Reader DC Heap-based Buffer Overflow Vulnerability Could Lead To Arbitrary Code Execution KEVCVSS 3.1HIGH 8.8
Sources
- CVE-2026-34621 · CVE Program
- CVE-2026-34621 · NVD
- CISA Known Exploited Vulnerabilities
- FIRST EPSS
- GHSA-vcqh-932g-m3qj · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences