CVE-2026-22693: medium-severity vulnerability in harfbuzz
Null Pointer Dereference in SubtableUnicodesCache::create leading to DoS
Published · Updated
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.3epss 0.5%
HarfBuzz is a text shaping engine. Prior to version 12.3.0, a null pointer dereference vulnerability exists in the SubtableUnicodesCache::create function located in src/hb-ot-cmap-table.hh. The function fails to check if hb_malloc returns NULL before using placement new to construct an object at the returned pointer address. When hb_malloc fails to allocate memory (which can occur in low-memory conditions or when using custom allocators that simulate allocation failures), it returns NULL. The code then attempts to call the constructor on this null pointer using placement new syntax, resulting in undefined behavior and a Segmentation Fault. This issue has been patched in version 12.3.0.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Affected products
harfbuzz · harfbuzzRelated CVEs — harfbuzz
In the same product, most dangerous first.
CVE-2024-56732CRITICALHarfBuzz heap-buffer-overflow on hb_cairo_glyphs_from_bufferEPSS 0.7%CVE-2026-113679HIGHHarfBuzz 8.0.0 through 14.6.0 Out-of-Bounds Write via WebAssembly font_glyph_to_stringEPSS 0.2%CVE-2026-113680MEDIUMHarfBuzz 8.0.0 through 14.6.0 WebAssembly Shaper NULL Pointer Dereference DoSEPSS 0.2%