Medium severity · published Oct 27, 2026
CVE-2026-116840
llama.cpp b5854 before b11275 Integer Overflow in gguf_init_from_reader
New
6.1
CVSS
0.1%
EPSS
No
On KEV
Description
llama.cpp b5854 before b11275 contains an integer overflow vulnerability in gguf_init_from_reader that bypasses the CVE-2025-53630 size check when padding near-SIZE_MAX tensor sizes. Attackers can supply a crafted GGUF file whose tensor size pads to zero, causing an undersized data blob and out-of-bounds reads by consumers.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 2% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LL
llama.cpp · ggml-org
b5854 before b11275; 0.1.0 before 0.6.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-116840
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-116840
github.com
https://github.com/ggml-org/llama.cpp/blob/v0.5.0/ggml/src/gguf.cpp#L794-L795
github.com
https://github.com/ggml-org/llama.cpp/commit/a6ea155d3d38b3f6f43d0c0dc29c2d592413ef44
github.com
https://github.com/ggml-org/llama.cpp/issues/26978
github.com
https://github.com/ggml-org/llama.cpp/pull/26979
github.com
https://github.com/ggml-org/llama.cpp/releases/tag/b11275
www.vulncheck.com
https://www.vulncheck.com/advisories/llama-cpp-b5854-before-b11275-integer-overflow-in-gguf-init-from-reader
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