# CVE-2026-120433: Netpbm before 10.86.51, 11.02.30, and 11.15.08 picttoppm Stack Buffer Overflow via paintPoly

Status: published. Published: 2026-11-02. Updated: 2026-11-02.

Netpbm before 10.86.51, 11.x before 11.02.30, and 11.03 before 11.15.08 contains a stack-based buffer overflow in the picttoppm paintPoly() function due to an unbounded polygon point count. Attackers can supply a crafted PICT file with a polygon exceeding 100 points to overwrite the fixed pts array, causing crashes or potentially code execution.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Netpbm / Netpbm: ≥ 0; < 10.86.51 (affected, custom); ≥ 11.0; < 11.02.30 (affected, custom); ≥ 11.03; < 11.15.08 (affected, custom). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 8.5 (high); 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; source: CNA: VulnCheck

- CVSS 3.1: 7.8 (high); CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-121

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://sourceforge.net/p/netpbm/code/5328/ (CNA: VulnCheck; patch)

- https://svn.code.sf.net/p/netpbm/code/!svn/bc/5358/stable/doc/HISTORY (CNA: VulnCheck; release-notes)

- https://svn.code.sf.net/p/netpbm/code/!svn/bc/5357/advanced/doc/HISTORY (CNA: VulnCheck; release-notes)

- https://svn.code.sf.net/p/netpbm/code/!svn/bc/5371/super_stable/doc/HISTORY (CNA: VulnCheck; release-notes)

- https://svn.code.sf.net/p/netpbm/code/!svn/bc/5327/trunk/converter/ppm/picttoppm.c (CNA: VulnCheck; technical-description)

- https://www.vulncheck.com/advisories/netpbm-before-10.86.51-11.02.30-and-11.15.08-picttoppm-stack-buffer-overflow-via-paintpoly (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-120433; retrieved 2026-11-02; source updated 2026-11-02

Revision: 56623e4ac04ead7190481659269b9dec51c86896e846a1ca3c43a0e28521c546

Canonical: https://y2.dev/cve/CVE-2026-120433

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