CVE-2026-120432: Netpbm integer overflow in winicontopam

CVE-2026-120432 · Severity: high · CVSS 7.8 · Published 2026-11-02

Netpbm is a graphics format conversion tool used to process image files. An integer overflow in its Windows icon converter allows an attacker to supply a crafted icon file with oversized dimensions that causes the tool to corrupt heap memory, leading to crashes or potentially executing arbitrary code.

Technologies: Netpbm. Vendors: Netpbm.

Quick answers

Is CVE-2026-120432 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-120432 being exploited in the wild.
How severe is CVE-2026-120432?
High severity, with a CVSS score of 7.8, published 2 November 2026.
Which products and versions are affected?
Netpbm before 10.86.51, 11.02.30, and 11.15.08.
Is there a fix for CVE-2026-120432?
Yes: fixed in Netpbm 10.86.51, 11.02.30, 11.15.08. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-120432 attacked?
It is attacked with local access, in a software library.
Am I affected by CVE-2026-120432?
Check whether you run Netpbm at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • Fixed in: Netpbm 10.86.51, 11.02.30, 11.15.08

Technical details

An integer overflow vulnerability exists in winicontopam's handling of ICO/CUR file dimensions. When width or height values exceed 32767, they wrap int16_t loop counters into negative values, causing out-of-bounds heap buffer access. The vulnerability is triggered by parsing a maliciously crafted icon file with no additional preconditions; exploitation may result in denial of service or code execution.

Affected products

  • Netpbm Netpbm before 10.86.51, 11.02.30, and 11.15.08

Timeline

  • 2026-11-02: disclosed
  • 2026-09-11: patched: Fix committed to repository

References

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