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archive/Patch now/AIR-2026-1321
closedclosed 1 Sep 2026Patch now2 Disclosed vulnerabilityAI

llama.cpp vulnerable to denial of service via negative top_n reranking value

llama.cpp

The llama.cpp framework when started with the reranking flag allows remote attackers to cause a denial of service via a negative top_n value in POST requests. The issue results in std::bad_alloc errors and HTTP 500 status codes.

disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why

CVSS
7.5
EPSS
0.01 · top 52% · 2026-11-13
EPSS scores by FIRST
fix status
Fix status unknown
first report
1 Sep 2026
last update
1 Sep 2026
CVE ids
CVE-2026-52132other records

Timeline · 1

  1. 1 Sep 2026CVE-2026-52132: llama.cpp through commit 97f06e9, when started with the --reranking flag, allows remote attackers to cause a denial of service…

Sources · 1

Advisories and databases

  1. 2026-09-01
    CVE-2026-52132: llama.cpp through commit 97f06e9, when started with the --reranking flag, allows remote attackers to cause a denial of service…
    NVD · nvd.nist.gov/vuln/detail/CVE-2026-52132

Titles and links belong to their publishers. The summary above is written by gcdRadar in its own words; data is CC BY-SA 4.0.

Classification

lane
Patch now
AI role
Attack on AI
categories
Infrastructure vulnerability
severity
2 · Disclosed vulnerability
fix status
Fix status unknown
targets
Framework / tooling
owasp llm top 10
LLM03:2025 Supply Chain
mitre atlas
no technique for these categories
tags
denial-of-service
dates
happened 1 Sep 2026 · first reported 1 Sep 2026
origin
NVD
Vulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
record
confidence 0.95 · created 2026-10-18 10:04Z · updated 2026-10-18 10:04Z

Lane, AI role, categories and severity come from the classifier; the OWASP and ATLAS rows are derived from the categories. How these are assigned

Copy a brief

This record as a short Markdown brief, for a ticket, a chat or a coding agent.

the brief as text
# llama.cpp vulnerable to denial of service via negative top_n reranking value

https://gcdradar.vercel.app/incidents/llama-cpp-vulnerable-to-denial-of-service-via-negative-top-n · AIR-2026-1321 · closed 2026-09-01

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-09-01
- AI role: Attack on AI
- Products: llama.cpp
- CVE ids: CVE-2026-52132
- CVSS: 7.5

## Summary

The llama.cpp framework when started with the reranking flag allows remote attackers to cause a denial of service via a negative top_n value in POST requests. The issue results in std::bad_alloc errors and HTTP 500 status codes.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2026-09-01: CVE-2026-52132: llama.cpp through commit 97f06e9, when started with the --reranking flag, allows remote attackers to cause a denial of service… (https://nvd.nist.gov/vuln/detail/CVE-2026-52132)

## Sources

- 2026-09-01 NVD: CVE-2026-52132: llama.cpp through commit 97f06e9, when started with the --reranking flag, allows remote attackers to cause a denial of service… https://nvd.nist.gov/vuln/detail/CVE-2026-52132

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.

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