High
llama.cpp — security advisory
llama.cpp builds b1283 through b9058 contain an integer overflow vulnerability in the llama_batch_init() function where unchecked multiplications in malloc() calls can wrap past INT32_MAX when computing allocation sizes. Attackers can pass specially crafted parameters to trigger integer overflow, causing heap corruption and potentially achieving arbitrary code execution through subsequent batch operations that write past allocated buffer boundaries.
- Products
- llama.cpp
- Affected versions
- 10438+dfsg-1, 10438+dfsg-1ubuntu1, 5882+dfsg-2, 8064+dfsg-1ubuntu1, 8681+dfsg-1, 9721+dfsg-1ubuntu1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-43627
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:44 UTC · Revision 1
Source evidence
llama.cpp builds b1283 through b9058 contain an integer overflow vulnerability in the llama_batch_init() function where unchecked multiplications in malloc() calls can wrap past INT32_MAX when computing allocation sizes. Attackers can pass specially crafted parameters to trigger integer overflow, causing heap corruption and potentially achieving arbitrary code execution through subsequent batch operations that write past allocated buffer boundaries.
osv:UBUNTU-CVE-2026-43627
llama.cpp
Fixed versions: Not specified
llama.cpp
Fixed versions: Not specified
Complete source record
{
"id": "0f4e5fee0ed5c07588328946a656aa90ea7df9fa951631ff4b868825987d048b",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-43627",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-43627",
"summary": "llama.cpp builds b1283 through b9058 contain an integer overflow vulnerability in the llama_batch_init() function where unchecked multiplications in malloc() calls can wrap past INT32_MAX when computing allocation sizes. Attackers can pass specially crafted parameters to trigger integer overflow, causing heap corruption and potentially achieving arbitrary code execution through subsequent batch operations that write past allocated buffer boundaries.",
"evidence": "osv:UBUNTU-CVE-2026-43627",
"products": [
{
"name": {
"value": "llama.cpp",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "8681+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "9721+dfsg-1ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "10438+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "10438+dfsg-1ubuntu1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "llama.cpp",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "5882+dfsg-2",
"evidence": "/affected/1/versions"
},
{
"value": "8064+dfsg-1ubuntu1",
"evidence": "/affected/1/versions"
},
{
"value": "8681+dfsg-1",
"evidence": "/affected/1/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-43627",
"aliases": [
"UBUNTU-CVE-2026-43627"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
},
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
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"purl": "pkg:deb/ubuntu/llama.cpp?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"8681+dfsg-1",
"9721+dfsg-1ubuntu1",
"10438+dfsg-1",
"10438+dfsg-1ubuntu1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-43627.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libllama0",
"binary_version": "10438+dfsg-1ubuntu1"
},
{
"binary_name": "llama.cpp",
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},
{
"binary_name": "llama.cpp-examples",
"binary_version": "10438+dfsg-1ubuntu1"
},
{
"binary_name": "llama.cpp-services",
"binary_version": "10438+dfsg-1ubuntu1"
},
{
"binary_name": "llama.cpp-tests",
"binary_version": "10438+dfsg-1ubuntu1"
},
{
"binary_name": "llama.cpp-tools",
"binary_version": "10438+dfsg-1ubuntu1"
},
{
"binary_name": "llama.cpp-tools-extra",
"binary_version": "10438+dfsg-1ubuntu1"
},
{
"binary_name": "python3-gguf",
"binary_version": "10438+dfsg-1ubuntu1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "llama.cpp",
"purl": "pkg:deb/ubuntu/llama.cpp?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"5882+dfsg-2",
"8064+dfsg-1ubuntu1",
"8681+dfsg-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-43627.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libllama0",
"binary_version": "8681+dfsg-1"
},
{
"binary_name": "llama.cpp",
"binary_version": "8681+dfsg-1"
},
{
"binary_name": "llama.cpp-examples",
"binary_version": "8681+dfsg-1"
},
{
"binary_name": "llama.cpp-tests",
"binary_version": "8681+dfsg-1"
},
{
"binary_name": "llama.cpp-tools",
"binary_version": "8681+dfsg-1"
},
{
"binary_name": "llama.cpp-tools-extra",
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{
"binary_name": "python3-gguf",
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}
]
}
}
],
"modified": "2026-10-17T12:58:55.601285010Z",
"provider": "osv",
"upstream": [
"CVE-2026-43627"
],
"references": [
"https://ubuntu.com/security/CVE-2026-43627",
"https://www.cve.org/CVERecord?id=CVE-2026-43627",
"https://github.com/Vladimir-tokarev-cyera/llama-cpp-security-patches"
]
},
"related_cves": [
{
"value": "CVE-2026-43627",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 359178,
"published_at": "2026-08-06T22:17:00+00:00"
}