Stack-Based Buffer Overflow in Netpbm Affected by Unbounded Polygon Point Count
CVE-2026-120433

8.5HIGH

Key Information:

Vendor

Netpbm

Status
Netpbm
Vendor
CVE Published:
2 November 2026

What is CVE-2026-120433?

The vulnerability in Netpbm arises from a stack-based buffer overflow in the paintPoly() function of picttoppm. An attacker can exploit this flaw by crafting a PICT file that includes a polygon with an excessive number of points, exceeding the fixed pts array's capacity. This can lead to code execution or program crashes, posing a substantial risk to systems running vulnerable versions of Netpbm.

Affected Version(s)

Netpbm 0 < 10.86.51

Netpbm 11.0 < 11.02.30

Netpbm 11.03 < 11.15.08

References

https://sourceforge.net/p/netpbm/code/5328/
patch
https://svn.code.sf.net/p/netpbm/code/!svn/bc/5358/stable...
release-notes
https://svn.code.sf.net/p/netpbm/code/!svn/bc/5357/advanc...
release-notes

CVSS V4

Score:
8.5
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Tristan Madani (Talence Security)
Bryan Henderson
.