ZDI-26-777: Adobe Photoshop AdobePDFL PDF JPEG Parsing Integer Overflow Remote Code Execution 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
- 7.8
- EPSS
- 0%
Affected versions
Key insight
The advisory contains no indication of active exploitation or KEV listing; exploitation requires user interaction.
Description
CVE-2026-83661 is an integer overflow vulnerability in Adobe Photoshop's PDF/JPEG parsing via AdobePDFL. A remote attacker can execute arbitrary code in the user's context by using a crafted file or a malicious webpage. Exploitation requires user interaction, such as opening a prepared PDF or JPEG file. ZDI rates the vulnerability as high with a CVSS score of 7.8. The advisory contains no indication of active exploitation or CISA KEV listing.
Risk score
- cvss base
- 78.00
- kev bonus
- 0.00
- epss bonus
- 0.00
- poc bonus
- 15.00
- raw before weight
- 93.00
- industry weight
- 1.21
- freshness factor
- 0.50
- exploitability factor
- 1.00
- days old
- 27.00
- vendor mismatch penalty
- 0.00
Path: operational
MITRE ATT&CK mapping
1 TTPProcedure details
| Technique | Tactic | Procedure | Conf. | Source |
|---|---|---|---|---|
| T1203 Exploitation for Client Execution | Execution | The attacker crafts a malicious PDF or JPEG file that exploits an integer overflow vulnerability in Adobe Photoshop's AdobePDFL PDF JPEG parsing. When the user opens the malicious file (or visits a malicious page that invokes the vulnerable component), arbitrary code is executed on the victim's system. | high | llm |