ZDI-26-669: Adobe Acrobat Reader DC JBIG2 File Parsing Out-Of-Bounds Read Information Disclosure Vulnerability
ZDI advisory ZDI-26-669 details an out-of-bounds read (CVE-2026-81978) when Adobe Acrobat Reader DC parses JBIG2 files.
The Zero Day Initiative published advisory ZDI-26-669 for an out-of-bounds read triggered when Acrobat Reader DC parses JBIG2 files. Successful exploitation allows a remote attacker to disclose sensitive information from affected installations. User interaction is required, such as opening a malicious file or visiting a malicious page. ZDI rated the issue 3.3 and assigned CVE-2026-81978.
- Out-of-bounds read occurs during JBIG2 file parsing in Acrobat Reader DC
- Flaw enables information disclosure but requires user interaction
- ZDI assigned CVSS 3.3 and CVE-2026-81978
- CVEs
- CVE-2026-81978
- Vendors
- AdobeZero Day Initiative
- Products
- Adobe Acrobat Reader DC
Vulnerabilities mentioned
All| CVE | Vulnerability | CVSS | EPSS | Signals | Published |
|---|---|---|---|---|---|
| CVE-2026-81978 | Out-of-Bounds Read in Adobe Acrobat Reader JBIG2 Parsing Leaks Sensitive Memory | 5.5 | <1% |
From the original article
This vulnerability allows remote attackers to disclose sensitive information on affected installations of Adobe Acrobat Reader DC. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The ZDI has assigned a CVSS rating of 3.
zerodayinitiative.com
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