# CVE-2026-78147 — ggml-org llama.cpp

> As of 2026-08-23, CVE-2026-78147 is a HIGH-severity vulnerability in ggml-org llama.cpp, CVSS v3.1 7.3, EPSS 0.4% (35.8th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-78147 as of 2026-08-23; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-08-23

## What is CVE-2026-78147?

A vulnerability was found in ggml-org llama.cpp bec4772f6. The impacted element is the function deserialize_tensor of the file ggml/src/ggml-rpc/ggml-rpc.cpp of the component ggml-RPC Server. Performing a manipulation of the argument op/op_params results in deserialization. The attack may be initiated remotely. This vulnerability is distinct from CVE-2026-34159 (GHSA-j8rj-fmpv-wcxw, PR #20908), which only added a buffer==nullptr rejection in create_node() and does not validate op or op_params. The reported GitHub issue was closed automatically due to inactivity.

The record classifies CVE-2026-78147 under weakness classes [CWE-502](https://intel.threadlinqs.com/cwe/CWE-502), [CWE-20](https://intel.threadlinqs.com/cwe/CWE-20). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 43 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 7.3 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:X/RC:R`)
- **CVSS v4.0 base score:** 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X`)
- **EPSS (FIRST):** 0.4% probability of exploitation in the next 30 days, higher than 35.8% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 5.1/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-23

## Is CVE-2026-78147 being exploited?

It currently carries a trending score of 39 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **ggml-org**: llama.cpp

## How to fix CVE-2026-78147

No vendor patch reference has been recorded for CVE-2026-78147 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-78147

No threat campaign in the Threadlinqs corpus currently references CVE-2026-78147, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, GitHub Security Advisories, FIRST EPSS. Last verified by Threadlinqs on 2026-08-24.

**Technical analysis**

- [vuldb.com — vdb entry](https://vuldb.com/vuln/394534)

**Third-party advisory**

- [vuldb.com — signature](https://vuldb.com/vuln/394534/cti)
- [vuldb.com — third party advisory](https://vuldb.com/cve/CVE-2026-78147)
- [vuldb.com — third party advisory (882534)](https://vuldb.com/submit/882534)

**Issue tracking and product pages**

- [github.com — issue tracking](https://github.com/ggml-org/llama.cpp/issues/25289)
- [github.com — product](https://github.com/ggml-org/llama.cpp/)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-78147
Full detection coverage and IOCs for threats exploiting CVE-2026-78147 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp