Out-of-bounds read in HarfBuzz - #VU144328
Published: August 19, 2026
Vulnerability identifier: #VU144328
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to disclose sensitive information and cause a denial of service.
The vulnerability exists due to out-of-bounds read in hb_buffer_add_utf() when processing caller-supplied text buffers with an item_offset greater than text_length and an explicit item_length of 0. A local user can supply crafted item_offset and item_length values to disclose sensitive information and cause a denial of service.
The issue occurs during the pre-context collection phase and affects the public APIs hb_buffer_add_utf8(), hb_buffer_add_utf16(), hb_buffer_add_utf32(), and hb_buffer_add_latin1().
Affected software
HarfBuzz
Remediation
Install security update from vendor's website.
HarfBuzz - update to 14.0.0