Heap Out-of-Bounds Write in OpenJPH Affecting Memory Handling
CVE-2026-111151

6.9MEDIUM

Key Information:

Vendor

Aous72

Status
Openjph
Vendor
CVE Published:
15 October 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-111151?

OpenJPH, up to version 0.32.0, features a vulnerability in the HTJ2K cleanup-pass decoder that permits an attacker to execute a heap out-of-bounds write. This is achievable by supplying a specially crafted .j2c or .jph codestream with small precinct sizes, leading to memory corruption as the decoder erroneously writes data beyond the allocated buffer. This flaw can cause crashes and potentially be exploited to execute code in the context of the affected application.

Affected Version(s)

OpenJPH 0 <= 0.32.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-111151 - Proof of Concept

References

https://hackmd.io/@haind-pwn/openjph-htj2k-degenerate-cod...
technical-descriptionexploit
https://github.com/aous72/OpenJPH/blob/23c422895ce6c3a156...
technical-description
https://github.com/aous72/OpenJPH/blob/23c422895ce6c3a156...
technical-description

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

HaiND from the Post and Telecommunication Institute of Technology
.