Medium severity · published Oct 27, 2026
CVE-2025-71439
llama.cpp before b5649 Heap Out-of-Bounds Read via llama_vocab::impl::print_info
New
5.5
CVSS
0.1%
EPSS
No
On KEV
Description
llama.cpp before b5649 contains a heap out-of-bounds read vulnerability in llama_vocab::impl::print_info() that allows attackers to crash model loading via oversized special token IDs. Attackers can supply a crafted GGUF model with a short tokenizer.ggml.tokens array, causing llama-cli or llama-server to read past id_to_token and crash.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
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
before b5649 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-71439
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-71439
github.com
https://github.com/ggml-org/llama.cpp/blob/b5648/src/llama-vocab.cpp#L2771
github.com
https://github.com/ggml-org/llama.cpp/commit/c33fe8b8c4427202706b1434e9fc8ab5752c9cac
github.com
https://github.com/ggml-org/llama.cpp/pull/14145
github.com
https://github.com/ggml-org/llama.cpp/releases/tag/b5649
github.com
https://github.com/ggml-org/llama.cpp/security/advisories/GHSA-g4cc-763q-h9h6
www.vulncheck.com
https://www.vulncheck.com/advisories/llama-cpp-before-b5649-heap-out-of-bounds-read-via-llama-vocab-impl-print-info
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