ZDI-26-669: Adobe Acrobat Reader DC JBIG2 File Parsing Out-Of-Bounds Read Information Disclosure Vulnerability
Admiralty grading (A–F · 1–6)
Source reliability
- A Completely reliable
- B Usually reliable
- C Fairly reliable
- D Not usually reliable
- E Unreliable
- F Cannot be judged
Information credibility
- 1 Confirmed
- 2 Probably true
- 3 Possibly true
- 4 Doubtful
- 5 Improbable
- 6 Cannot be judged
NATO Admiralty (AJP-2.1) grades confidence, independent of the risk score. Cross-source corroboration isn't tracked for non-CVE news, so single-source items are capped at a lower credibility number; a low number does not imply low quality.
Key metrics
- CVSS
- 5.5
- EPSS
- 0%
Key insight
Low-severity vulnerability (CVSS 3.3) in Adobe Acrobat Reader DC with information disclosure potential through malicious PDF files, requires user interaction.
Description
An out-of-bounds read vulnerability in the JBIG2 file parsing of Adobe Acrobat Reader DC allows remote attackers to disclose sensitive information from the memory of affected installations. Exploitation requires user interaction, as the victim must open a malicious file or visit a malicious web page. The CVSS score of 3.3 indicates low severity. The vulnerability is registered as CVE-2026-81978.
Risk score
- cvss base
- 55.00
- kev bonus
- 0.00
- epss bonus
- 0.00
- poc bonus
- 15.00
- raw before weight
- 70.00
- industry weight
- 1.21
- freshness factor
- 1.00
- exploitability factor
- 1.00
- days old
- 0.00
- vendor mismatch penalty
- 0.00
Path: operational