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CVE-2026-120436— Netpbm before 10.86.51, 11.02.30, and 11.15.08 Heap Overflow via jbigtopnm

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.

在 Netpbm 10.86.51 之前版本、11.x 系列中 11.02.30 之前的版本，以及 11.03 系列中 11.15.08 之前的版本中，组件存在整数溢出漏洞。该漏洞在计算输出缓冲区大小时会引发堆缓冲区溢出。攻击者可构造一个具有超大头部尺寸的多平面 JBIG 文件，导致函数溢出尺寸不足的缓冲区，从而造成程序崩溃，甚至可能实现代码执行。

CVSS 7.8 · High Updated Nov 03, 2026

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

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

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Vulnerability Title

Netpbm before 10.86.51, 11.02.30, and 11.15.08 Heap Overflow via jbigtopnm

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 an integer overflow in jbigtopnm that causes heap buffer overflow when computing output buffer size. Attackers can supply a crafted multi-plane JBIG file with large header dimensions so jbg_dec_merge_planes() overflows the undersized buffer, causing crashes or potentially code execution.

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

整数溢出或超界折返

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-2026-120436

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-120436

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Other References for CVE-2026-120436 (6)

https://sourceforge.net/p/netpbm/code/5324/ 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/5323/trunk/converter/other/jbig/jbigtopnm.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-heap-overflow-via-jbigtopnm third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-120436

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-2026-120435	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-2026-120434	7.8 HIGH	Netpbm before 10.86.51, 11.02.30, and 11.15.08 picttoppm Stack Overflow via scanPoly
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-190