# CVE-2026-120434: Netpbm before 10.86.51, 11.02.30, and 11.15.08 picttoppm Stack Overflow via scanPoly

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 picttoppm's scanPoly() function in converter/ppm/picttoppm.c. Attackers can supply a crafted PICT file whose polygon edges produce more than 5000 points, overflowing the coord stack array to crash the converter or potentially execute code.

## 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/5331/ (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/5330/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-overflow-via-scanpoly (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-120434; retrieved 2026-11-02; source updated 2026-11-02

Revision: 091a9d2c0f643f840a0b42bf98d9adf21e5ec861e81f4e35af81fc0861962696

Canonical: https://y2.dev/cve/CVE-2026-120434

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.