Vulnerability · Published Oct 15, 2026 · Assigned by VulnCheck
CVE-2026-111151OpenJPH through 0.32.0 Heap Out-of-Bounds Write in HTJ2K Cleanup-Pass Decoder
Medium 6.1
In plain English
A medium-severity out-of-bounds write in OpenJPH from aous72. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities).
Severity (CVSS 3.1)6.1Medium
Exploit odds (30 days)0.1%top 97.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
OpenJPH through 0.32.0 contains a heap out-of-bounds write vulnerability in the HTJ2K cleanup-pass decoder that allows attackers to corrupt memory via one-row codeblocks. Attackers can supply a crafted .j2c or .jph codestream with small precinct sizes, causing the decoder to write a second row past the codeblock buffer, resulting in memory corruption and crashes.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | openjph | no fix listed | DEBIAN-CVE-2026-111151 |
| Debian:13 | openjph | no fix listed | DEBIAN-CVE-2026-111151 |
| Debian:14 | openjph | no fix listed | DEBIAN-CVE-2026-111151 |
| Ubuntu:24.04:LTS | openjph | no fix listed | UBUNTU-CVE-2026-111151 |
| Ubuntu:26.04:LTS | openjph | no fix listed | UBUNTU-CVE-2026-111151 |
| Ubuntu:26.10 | openjph | no fix listed | UBUNTU-CVE-2026-111151 |
Affected products (as reported)
Weakness: CWE-787 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
References
- https://hackmd.io/@haind-pwn/openjph-htj2k-degenerate-codeblock-cleanup-oob-write technical-description, exploit
- https://github.com/aous72/OpenJPH/blob/23c422895ce6c3a156935222e4715ee0b7be952c/src/core/codestream/ojph_subband.cpp#L136-L142 technical-description
- https://github.com/aous72/OpenJPH/blob/23c422895ce6c3a156935222e4715ee0b7be952c/src/core/codestream/ojph_codeblock.cpp#L79-L84 technical-description
- https://github.com/aous72/OpenJPH/blob/23c422895ce6c3a156935222e4715ee0b7be952c/src/core/coding/ojph_block_decoder32.cpp#L1135-L1155 technical-description
- https://github.com/aous72/OpenJPH product
- VulnCheck Advisory: OpenJPH through 0.32.0 Heap Out-of-Bounds Write in HTJ2K Cleanup-Pass Decoder third-party-advisory