llama.cpp has a Heap Buffer Overflow via Integer Overflow in `mem_size` Calculation — Bypass of CVE-2025-53630 Fix
Summary
llama.cpp has a Heap Buffer Overflow via Integer Overflow in mem_size Calculation — Bypass of CVE-2025-53630 Fix
Original description
The description as published by the source.
llama.cpp is an inference of several LLM models in C/C++. Prior to b8146, the gguf_init_from_file_impl() in gguf.cpp is vulnerable to an Integer overflow, leading to an undersized heap allocation. Using the subsequent fread() writes 528+ bytes of attacker-controlled data past the buffer boundary. This is a bypass of a similar bug in the same file - CVE-2025-53630, but the fix overlooked some areas. This vulnerability is fixed in b8146.
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-2026-27940 llama.cpp Fixed in: 8461+dfsg-1
- Ubuntu UBUNTU-CVE-2026-27940 llama.cpp
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov