Null Pointer Dereference in SubtableUnicodesCache::create leading to DoS
Summary
Null Pointer Dereference in SubtableUnicodesCache::create leading to DoS
Original description
The description as published by the source.
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.
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-22693 harfbuzz
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov
- patch github.com
- web openwall.com
- web openwall.com