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    CVE-2026-27940

    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.

    Published:Mar 12, 2026
    Last Modified:Apr 28, 2026
    EPS:Mar 12, 2026
    EPSS Score:0.00015
    CVSS Score:7.8

    Affected Products

    Vendor
    Ggml
    Product
    Llama.cpp

    Exploits

    https://github.com/ggml-org/llama.cpp/security/advisories/GHSA-3p4r-fq3f-q74vhttps://github.com/ngtuonghung/CVE-2026-27940

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-92 Forced Integer Overflow

    Related CVEs

    CVE-2026-52131 (CVSS 7.5) — llama.cpp b5693 and before has a Reachable Assertion via the gguf_reader::read function.…
    CVE-2026-52130 (CVSS 7.5) — llama.cpp b5693 and before is vulnerable to Uncontrolled Recursion in common/json-schema-to-grammar.cpp, resul…
    CVE-2026-52132 (CVSS 7.5) — llama.cpp through commit 97f06e9, when started with the --reranking flag, allows remote attackers to cause a d…
    CVE-2026-43632 (CVSS 9.2) — llama.cpp builds b7492 through the latest b9060 contains a use-after-free vulnerability in llama-server affect…
    CVE-2026-43631 (CVSS 9.2) — llama.cpp builds b7492 through the latest b9060 contains a use-after-free vulnerability in the vocab pointer o…
    CVE-2026-43630 (CVSS 6.3) — llama.cpp builds b5702 through b7653 contain an out-of-bounds read vulnerability in the recurrent memory state…
    CVE-2026-43629 (CVSS 9.2) — llama.cpp builds b4882 through b9058 contain a heap buffer overflow vulnerability in the KV cache state restor…
    CVE-2026-43628 (CVSS 8.5) — llama.cpp builds b3978 through b9058 contain an integer underflow and out-of-bounds read vulnerability in the …
    CVE-2026-43627 (CVSS 8.5) — llama.cpp builds b1283 through b9058 contain an integer overflow vulnerability in the llama_batch_init() funct…
    CVE-2026-70640 (CVSS 7.3) — llama.cpp builds b1886 through b7445 contain a race condition use-after-free vulnerability in the LLaMA-Androi…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High