AIKIDO-2026-542525
harfbuzz.harfbuzz is vulnerable to Out-of-bounds Read
44
Medium Risk
This Affects:
harfbuzz.harfbuzzTL;DR
HarfBuzz's buffer addition functions such as hb_buffer_add_utf8 share a template that validates item_length is non-negative but never checks that item_offset does not exceed the input text length. When a caller supplies an out-of-range item_offset together with a zero item_length, the pre-context collection step computes and then dereferences a pointer past the end of the input buffer. This produces a heap buffer over-read of up to a few characters that can disclose adjacent heap memory or crash the process. The fix clamps item_offset and item_length to the valid text range before the buffer is accessed.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and your application calls the buffer-add functions (such as hb_buffer_add_utf8) with an item_offset that can exceed the input text length.
Background info
harfbuzz.harfbuzz is vulnerable to Out-of-bounds Read in versions 0.9.5 - 13.2.1.
How to fix this
Upgrade the harfbuzz.harfbuzz library to the patch version.
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