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

Quick assessment

Affected

Netpbm Netpbm

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Netpbm 在 10.86.51 之前、11.x 系列在 11.02.30 之前，以及 11.03 系列在 11.15.08 之前，其的函数（位于）中存在一个基于栈的缓冲区溢出漏洞。攻击者可构造一个特制的 PICT 文件，使其多边形边产生超过 5000 个点，从而导致栈数组溢出，造成转换器崩溃，或可能实现代码执行。

CVSS 7.8 · High Updated Nov 02, 2026

Possible ATT&CK Techniques 2 AI

T1203 · Exploitation for Client Execution T1190 · Exploit Public-Facing Application

Affected Version Matrix 3

Vendor	Product	Version Range	Status
Netpbm	Netpbm	`< 10.86.51`	affected
		`11.0< 11.02.30`	affected
		`11.03< 11.15.08`	affected

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Vulnerability Information

Have questions about the vulnerability? See if Shenlong's analysis helps!

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Vulnerability Title

Netpbm before 10.86.51, 11.02.30, and 11.15.08 picttoppm Stack Overflow via scanPoly

Source: CVE Program / CVE List V5

Vulnerability Description

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.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

栈缓冲区溢出

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Netpbm	Netpbm	0 ~ 10.86.51	-

II. Public POCs for CVE-2026-120434

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-120434

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Other References for CVE-2026-120434 (6)

https://sourceforge.net/p/netpbm/code/5331/ patch
https://svn.code.sf.net/p/netpbm/code/!svn/bc/5371/super_stable/doc/HISTORY release-notes
https://svn.code.sf.net/p/netpbm/code/!svn/bc/5358/stable/doc/HISTORY release-notes
https://svn.code.sf.net/p/netpbm/code/!svn/bc/5330/trunk/converter/ppm/picttoppm.c technical-description
https://svn.code.sf.net/p/netpbm/code/!svn/bc/5357/advanced/doc/HISTORY release-notes
https://www.vulncheck.com/advisories/netpbm-before-10.86.51-11.02.30-and-11.15.08-picttoppm-stack-overflow-via-scanpoly third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-120434

Same Patch Batch · Netpbm · 2026-11-02 · 7 CVEs total

CVE-2026-120433	7.8 HIGH	Netpbm before 10.86.51, 11.02.30, and 11.15.08 picttoppm Stack Buffer Overflow via paintPo
CVE-2026-120436	7.8 HIGH	Netpbm before 10.86.51, 11.02.30, and 11.15.08 Heap Overflow via jbigtopnm
CVE-2026-120435	7.8 HIGH	Netpbm before 10.86.51, 11.02.30, and 11.15.08 Heap Overflow in xpmtoppm
CVE-2026-120432	7.8 HIGH	Netpbm before 10.86.51, 11.02.30, and 11.15.08 Integer Overflow in winicontopam
CVE-2026-120431	7.8 HIGH	Netpbm before 10.86.51, 11.02.29, and 11.15.07 sgitopnm Heap Buffer Overflow
CVE-2026-120437	6.1 MEDIUM	Netpbm before 10.86.51, 11.02.30, and 11.15.08 Out-of-Bounds Read via tgatoppm

IV. Related Vulnerabilities

Same product: Netpbm

Same vendor: Netpbm

Same weakness: CWE-121