CriticalFix available
llama.cpp — security advisory
llama.cpp is an inference of several LLM models in C/C++. Prior to version b8492, the RPC backend's deserialize_tensor() skips all bounds validation when a tensor's buffer field is 0. An unauthenticated attacker can read and write arbitrary process memory via crafted GRAPH_COMPUTE messages. Combined with pointer leaks from ALLOC_BUFFER/BUFFER_GET_BASE, this gives full ASLR bypass and remote code execution. No authentication required, just TCP access to the RPC server port. This issue has been patched in version b8492.
- Products
- llama.cpp
- Affected versions
- 5151+dfsg-1~exp2, 5151+dfsg-1~exp3, 5318+dfsg-1, 5318+dfsg-2, 5713+dfsg-1, 5760+dfsg-1, 5760+dfsg-2, 5760+dfsg-3, 5760+dfsg-4, 5882+dfsg-1, 5882+dfsg-2, 5882+dfsg-3, 5882+dfsg-3~exp1, 5882+dfsg-3~exp2, 5882+dfsg-3~exp3, 5882+dfsg-4, 6641+dfsg-1, 6641+dfsg-2, 6641+dfsg-3, 7593+dfsg-1, 7593+dfsg-2, 7593+dfsg-3, 7965+dfsg-1, 8064+dfsg-1, 8064+dfsg-2, 8461+dfsg-1
- Fixed versions
- 8611+dfsg-1
- CVEs
- CVE-2026-34159
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 17:36 UTC · Revision 2
Source evidence
llama.cpp is an inference of several LLM models in C/C++. Prior to version b8492, the RPC backend's deserialize_tensor() skips all bounds validation when a tensor's buffer field is 0. An unauthenticated attacker can read and write arbitrary process memory via crafted GRAPH_COMPUTE messages. Combined with pointer leaks from ALLOC_BUFFER/BUFFER_GET_BASE, this gives full ASLR bypass and remote code execution. No authentication required, just TCP access to the RPC server port. This issue has been patched in version b8492.
osv:DEBIAN-CVE-2026-34159
llama.cpp
Fixed versions: 8611+dfsg-1
Complete source record
{
"id": "57a5cb4e07342d5f66b27f2881e253399c33d2f63c94c798c9b0082d8ca810c8",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-34159",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-34159",
"summary": "llama.cpp is an inference of several LLM models in C/C++. Prior to version b8492, the RPC backend's deserialize_tensor() skips all bounds validation when a tensor's buffer field is 0. An unauthenticated attacker can read and write arbitrary process memory via crafted GRAPH_COMPUTE messages. Combined with pointer leaks from ALLOC_BUFFER/BUFFER_GET_BASE, this gives full ASLR bypass and remote code execution. No authentication required, just TCP access to the RPC server port. This issue has been patched in version b8492.",
"evidence": "osv:DEBIAN-CVE-2026-34159",
"products": [
{
"name": {
"value": "llama.cpp",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "8611+dfsg-1",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
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"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
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{
"value": "5318+dfsg-2",
"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
},
{
"value": "5760+dfsg-1",
"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
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{
"value": "5760+dfsg-3",
"evidence": "/affected/0/versions"
},
{
"value": "5760+dfsg-4",
"evidence": "/affected/0/versions"
},
{
"value": "5882+dfsg-1",
"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
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{
"value": "5882+dfsg-3~exp2",
"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
},
{
"value": "6641+dfsg-3",
"evidence": "/affected/0/versions"
},
{
"value": "7593+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "7593+dfsg-2",
"evidence": "/affected/0/versions"
},
{
"value": "7593+dfsg-3",
"evidence": "/affected/0/versions"
},
{
"value": "7965+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "8064+dfsg-1",
"evidence": "/affected/0/versions"
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{
"value": "8064+dfsg-2",
"evidence": "/affected/0/versions"
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{
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],
"severity": "critical",
"structured": {
"id": "DEBIAN-CVE-2026-34159",
"aliases": [
"DEBIAN-CVE-2026-34159"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "8611+dfsg-1"
}
]
}
],
"package": {
"name": "llama.cpp",
"purl": "pkg:deb/debian/llama.cpp?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"5151+dfsg-1~exp2",
"5151+dfsg-1~exp3",
"5318+dfsg-1",
"5318+dfsg-2",
"5713+dfsg-1",
"5760+dfsg-1",
"5760+dfsg-2",
"5760+dfsg-3",
"5760+dfsg-4",
"5882+dfsg-1",
"5882+dfsg-2",
"5882+dfsg-3",
"5882+dfsg-3~exp1",
"5882+dfsg-3~exp2",
"5882+dfsg-3~exp3",
"5882+dfsg-4",
"6641+dfsg-1",
"6641+dfsg-2",
"6641+dfsg-3",
"7593+dfsg-1",
"7593+dfsg-2",
"7593+dfsg-3",
"7965+dfsg-1",
"8064+dfsg-1",
"8064+dfsg-2",
"8461+dfsg-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34159.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-27T09:47:33.491021756Z",
"provider": "osv",
"upstream": [
"CVE-2026-34159"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-34159"
]
},
"related_cves": [
{
"value": "CVE-2026-34159",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 460870,
"published_at": "2026-04-01T18:16:29.687+00:00"
}