CVE-2026-34159

9.8

CRITICAL CVSS 3.1

llama.cpp: Unauthenticated RCE via GRAPH_COMPUTE buffer=0 bypass in llama.cpp RPC backend

Overview

Description

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.

Details

INFO

Published Date :

April 1, 2026, 6:16 p.m.

Last Modified :

April 30, 2026, 7:18 p.m.

Remotely Exploit :

Yes !

Source :

[email protected]

Impact

Affected Products

The following products are affected by CVE-2026-34159 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID	Vendor	Product	Action
1	Ggml	llama.cpp

: Total Affected Vendor : 1 | Products : 1

Scoring

CVSS Scores

The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.

Score	Version	Severity	Vector	Exploitability Score	Impact Score	Source
	CVSS 3.1	CRITICAL				[email protected]
	CVSS 3.1	CRITICAL				MITRE-CVE

Solution

Update llama.cpp to b8492 or later to fix memory corruption and RCE.

Update llama.cpp to version b8492 or later.
Ensure RPC backend is configured securely.
Disable RPC backend if not in use.

Public PoC/Exploit Available at Github

CVE-2026-34159 has a 4 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

References

References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-34159.

URL	Resource
https://github.com/ggml-org/llama.cpp/commit/39bf0d3c6a95803e0f41aaba069ffbee26721042	Patch
https://github.com/ggml-org/llama.cpp/pull/20908	Issue Tracking Patch
https://github.com/ggml-org/llama.cpp/security/advisories/GHSA-j8rj-fmpv-wcxw	Exploit Vendor Advisory

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-34159 is associated with the following CWEs:

CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-34159 weaknesses.

CAPEC-8: Buffer Overflow in an API Call Buffer Overflow in an API Call CAPEC-9: Buffer Overflow in Local Command-Line Utilities Buffer Overflow in Local Command-Line Utilities CAPEC-10: Buffer Overflow via Environment Variables Buffer Overflow via Environment Variables CAPEC-14: Client-side Injection-induced Buffer Overflow Client-side Injection-induced Buffer Overflow CAPEC-24: Filter Failure through Buffer Overflow Filter Failure through Buffer Overflow CAPEC-42: MIME Conversion MIME Conversion CAPEC-44: Overflow Binary Resource File Overflow Binary Resource File CAPEC-45: Buffer Overflow via Symbolic Links Buffer Overflow via Symbolic Links CAPEC-46: Overflow Variables and Tags Overflow Variables and Tags CAPEC-47: Buffer Overflow via Parameter Expansion Buffer Overflow via Parameter Expansion CAPEC-100: Overflow Buffers Overflow Buffers CAPEC-123: Buffer Manipulation Buffer Manipulation

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

rohithronanki/CVE-2026-34159-Vulnerability-Research-Analysis-Detection

Critical buffer validation bypass in deserialize_tensor() (llama.cpp < b8492). Null tensor buffer skips bounds check, enabling unauthenticated arbitrary R/W via GRAPH_COMPUTE. ASLR bypass + RCE over TCP 50052.

Updated: 2 weeks, 3 days ago

0 stars 0 fork 0 watcher

Born at : May 4, 2026, 8:59 a.m. This repo has been linked 1 different CVEs too.

casp3r0x0/CVE-2026-34159

0 Click RCE exploit for CVE-2026-34159 Lama.cpp RPC server

Python

Updated: 3 weeks, 4 days ago

16 stars 8 fork 8 watcher

Born at : April 23, 2026, 9:14 p.m. This repo has been linked 1 different CVEs too.

joseruiz1571/ml-pickle-vulnerabilities

Curated knowledge base tracking pickle deserialization vulnerabilities in ML frameworks. For GRC professionals and security teams.

Python

Updated: 3 weeks, 3 days ago

0 stars 0 fork 0 watcher

Born at : Jan. 18, 2026, 2:45 p.m. This repo has been linked 12 different CVEs too.

nomi-sec/PoC-in-GitHub

📡 PoC auto collect from GitHub. ⚠️ Be careful Malware.

security cve exploit poc vulnerability

Updated: 3 weeks, 5 days ago

7667 stars 1247 fork 1247 watcher

Born at : Dec. 8, 2019, 1:03 p.m. This repo has been linked 749 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-34159 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-34159 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

Initial Analysis by [email protected]

Apr. 30, 2026

Action	Type	New Value
Added	CPE Configuration	OR cpe:2.3:a:ggml:llama.cpp::::::::* versions up to (excluding) b8492
Added	Reference Type	GitHub, Inc.: https://github.com/ggml-org/llama.cpp/commit/39bf0d3c6a95803e0f41aaba069ffbee26721042 Types: Patch
Added	Reference Type	GitHub, Inc.: https://github.com/ggml-org/llama.cpp/pull/20908 Types: Issue Tracking, Patch
Added	Reference Type	GitHub, Inc.: https://github.com/ggml-org/llama.cpp/security/advisories/GHSA-j8rj-fmpv-wcxw Types: Exploit, Vendor Advisory

New CVE Received by [email protected]

Apr. 01, 2026

Action	Type	New Value
Added	Description	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.
Added	CVSS V3.1	AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Added	CWE	CWE-119
Added	Reference	https://github.com/ggml-org/llama.cpp/commit/39bf0d3c6a95803e0f41aaba069ffbee26721042
Added	Reference	https://github.com/ggml-org/llama.cpp/pull/20908
Added	Reference	https://github.com/ggml-org/llama.cpp/security/advisories/GHSA-j8rj-fmpv-wcxw

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.