---
id: "CVE-2026-120432"
kind: "vulnerability"
aliases: ["CVE-2026-120432"]
title: "Netpbm: crafted icon file corrupts heap memory in winicontopam"
severity: "high"
cvss: 8.5
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["image-processing", "netpbm", "package", "self-hosted"]
not_affected_if: ["no-untrusted-icon-input"]
published_at: "2026-11-02T15:17:24+00:00"
first_seen_at: "2026-11-02T15:24:01+00:00"
updated_at: "2026-11-02T15:25:59+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-120432", "first_seen_at": "2026-11-02T15:24:01+00:00"}]
---

# Netpbm: crafted icon file corrupts heap memory in winicontopam

Netpbm's winicontopam converter has an integer overflow when reading ICO or CUR files with width or height above 32767. A crafted icon file can corrupt heap memory, causing a crash or possibly code execution.

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

## How to check

- Check the installed Netpbm version (for example with `pnmcat --version` or your package manager) and compare it against the fixed versions listed under Fix.
- Look for `winicontopam` on systems that convert untrusted ICO or CUR files.

## Fix

- Netpbm `10.86.51`, `11.02.30`, or `11.15.08` (the fixed release on each branch)

## Timeline

- 2026-11-02T15:24:01+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-120432

## Documents

- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/netpbm-before-10.86.51-11.02.30-and-11.15.08-integer-overflow-in-winicontopam

## From the sources

Netpbm before 10.86.51, 11.02.30, and 11.15.08 contains an integer overflow vulnerability in winicontopam that allows attackers to corrupt heap memory via oversized ICO/CUR dimensions. Attackers can supply a crafted icon file with width or height above 32767, wrapping int16_t loop counters into negative row buffer indices to cause crashes or potential code execution.

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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_