---
id: "CVE-2026-58966"
kind: "vulnerability"
aliases: ["CVE-2026-58966"]
title: "hppsfilter.c: stack buffer overflow lets a local user gain higher privileges"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["infrastructure", "unknown-product"]
not_affected_if: []
published_at: "2026-11-02T20:17:52+00:00"
first_seen_at: "2026-11-02T20:35:34+00:00"
updated_at: "2026-11-02T20:38:30+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-58966", "first_seen_at": "2026-11-02T20:35:34+00:00"}]
---

# hppsfilter.c: stack buffer overflow lets a local user gain higher privileges

Several functions in hppsfilter.c can write past the end of a stack buffer. An attacker with a local account could use this to escalate their privileges.

_Summary, check and fix written by a model from the sources; labelled as such._

## Timeline

- 2026-11-02T20:35:34+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-58966

## From the sources

In multiple functions of hppsfilter.c, there is a possible out-of-bounds write due to a stack buffer overflow. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_