CVE-2026-86317Network attack vector

Unauthenticated server crash via unvalidated tensor dimensions

Published Sep 7, 2026 · Updated Sep 8, 2026

Reachable assertion in llama.cpp RPC Server 0.4.0 and earlier allows remote attackers to crash the server via crafted tensor dimensions. rpc_server::deserialize_tensor passes network-supplied ne[0] to ggml_new_tensor_4d without checking quantization block-size alignment. No authentication is required; a HELLO followed by a crafted tensor command triggers SIGABRT and interrupts every RPC client.

CVSS severity5.3
Medium
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reachable assertion in llama.cpp RPC Server 0.4.0 and earlier allows remote attackers to crash the server via crafted tensor dimensions. rpc_server::deserialize_tensor passes network-supplied ne[0] to ggml_new_tensor_4d without checking quantization block-size alignment. No authentication is required; a HELLO followed by a crafted tensor command triggers SIGABRT and interrupts every RPC client.

The record

CVE
CVE-2026-86317
Published
Sep 7, 2026
Updated
Sep 8, 2026
Vendor
Georgi Gerganov
Product
llama.cpp
Classifications
CWE-617, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.1
  2. Affected versionversion=0.2
  3. Affected versionversion=0.3
  4. Affected versionversion=0.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Georgi Gerganov · llama.cppversion=0.1; version=0.2; version=0.3; version=0.4.0

Published CVSS scores

6.9VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
5.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
5.0VulDBAV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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