CVE-2026-51807

critical · 9.8

Heap-based out-of-bounds write in j2k_precinct_subband::parse_packet_header() in OpenHTJ2K versions 0.18.3 and earlier (fixed in v0.18.4) caused by missing bounds validation before coding-pass lengths are written to j2k_codeblock::pass_length[128]. A crafted JPEG 2000 codestream containing malformed PPM packet headers can trigger a heap-based out-of-bounds write in j2k_precinct_subband::parse_packet_header() in source/core/coding/coding_units.cpp due to missing bounds validation for the j2k_codeblock::pass_length[128] array which can lead to heap corruption and process termination.

9.8

CVSS

0.7%

EPSS (exploit prob.)

51st

EPSS percentile

2026-07-14

Published

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-121

References

https://github.com/osamu620/OpenHTJ2K/blob/main/CHANGELOG
https://github.com/osamu620/OpenHTJ2K/commit/0778b93
https://github.com/osamu620/OpenHTJ2K/compare/0778b93...v0.18.4
https://github.com/osamu620/OpenHTJ2K/releases

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-51807