Is CVE-2026-27940 actively exploited?

No active exploitation of CVE-2026-27940 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-27940 be exploited remotely?

No. CVE-2026-27940 requires local access to exploit.

What is the CVSS score of CVE-2026-27940?

CVE-2026-27940 has a CVSS score of 7.8 (HIGH).

HOME VULNERABILITIESCVE-2026-27940

HIGH

CVE-2026-27940

CWE-122Published: March 12, 2026· Updated: Mar 12, 2026

7.8

CVSS v3.1

EPSS:0.01%probability of exploitation in 30 daysPercentile:2.0th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-27940 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.8.