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Vulnerability record · CVE-2026-51807 · published 14 July 2026

CVE-2026-51807: Stack-based buffer overflow vulnerability

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 3.1 Critical EPSS 0.67% · top 50.0% CWE-121 · Stack-based buffer overflow Deferred
9.8CVSS 3.1 base score
0.67%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
17 Jul 2026Last modified by NVD

Description

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.

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

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-51807), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.