CVE WatchJul 17, 2026

CVE-2026-51807

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) ca

CVSS

9.8

Critical

EPSS

0.5%

p38

KEV

—

Exploit Today

0-100

Published: Jul 14, 2026 · Last modified: Jul 17, 2026 · CWE-121

EPSS · 30d

0.2%EPSS · 30 days0.5%

2026-07-152026-07-17

Technical 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.

Official references

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