TI-2026-83826 Aliases CVE-2026-120434 GHSA-vm8g-xfgm-cjmm

Stack buffer overflow in Netpbm picttoppm converter

LOW 38CWE-121Published 2026-11-02 · Updated 2026-11-05

Key facts

Attack vector: Local
Privileges required: None
User interaction: Passive
Attack complexity: Low
Attack requirements: None
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Partial Red Hat: 5 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-121 and the CVSS impact.

Summary

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 scanPoly() function of picttoppm (CWE-121). A crafted PICT file with polygon edges that produce more than 5000 points overflows the coord stack array. A local attacker who gets a user to convert such a file can crash the converter or potentially execute code.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00149 4th percentileScored 2026-11-07

Fix Partial Netpbm (Netpbm): 10.86.51, 11.02.30, 11.15.08Red Hat: 5 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Netpbm	Netpbm	before 10.86.51; 11.0 to before 11.02.30; 11.03 to before 11.15.08	10.86.51, 11.02.30, 11.15.08	Patch available	CNA

Netpbm VendorNetpbm Affected before 10.86.51; 11.0 to before 11.02.30; 11.03 to before 11.15.08 Fixed in 10.86.51, 11.02.30, 11.15.08 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:netpbm_project:netpbm::::::::	—	—	Netpbm Project

cpe:2.3:a:netpbm_project:netpbm:*:*:*:*:*:*:*:* Versions — — ·Netpbm Project

Remediation

Upgrade Netpbm to 10.86.51, 11.02.30, or 11.15.08, matching your release branch. Red Hat lists Red Hat Enterprise Linux 6, 7, 8, 9, and 10 as affected without a fix.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Fix · CNA Netpbm (Netpbm) Fixed in 10.86.51, 11.02.30, 11.15.08

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-11-02
Netpbm 10.86.51, 11.02.30, 11.15.08
6 records Highest priority Priority LOW 6 LOW
Other records, highest priority first
- TI-2026-83828 Heap overflow in Netpbm jbigtopnm can crash the tool or run codePriority LOW 38
- TI-2026-83827 Heap overflow in Netpbm xpmtoppm can crash or run codePriority LOW 38
- TI-2026-83825 Stack buffer overflow in Netpbm picttoppm paintPoly()Priority LOW 38
Show all 6 records →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Enterprise Linux 10	Affected	—
Red Hat Enterprise Linux 6	Affected	—
Red Hat Enterprise Linux 7	Affected	—
Red Hat Enterprise Linux 8	Affected	—
Red Hat Enterprise Linux 9	Affected	—

Timeline

2026-11-02 Threatist record created from CVE-2026-120434
2026-11-02 Alias added: GHSA-vm8g-xfgm-cjmm
2026-11-04 Priority changed: MEDIUM → LOW
2026-11-05 CISA SSVC decision points changed
2026-11-06 Affected versions changed · Red Hat
2026-11-06 CVSS score added · Red Hat

References

Patch 1

https://sourceforge.net/p/netpbm/code/5331/

Other 4

TI-2026-76476 Heap out-of-bounds read in Netpbm rasttopnm leaks memory CVSS 4.0MEDIUM 6.9
TI-2003-00141 Multiple vulnerabilities in NetPBM 9.20 and earlier, and possibly other versions, may… CVSS 2.0HIGH 7.5
TI-2005-02810 pnmtopng in netpbm before 10.25, when using the -trans option, uses uninitialized size… CVSS 2.0HIGH 7.5
TI-2009-04054 Stack-based buffer overflow in converter/ppm/xpmtoppm.c in netpbm before 10.47.07 allows… CVSS 2.0HIGH 7.5
TI-2005-02339 pstopnm in netpbm does not properly use the "-dSAFER" option when calling Ghostscript to… CVSS 2.0HIGH 7.5
TI-2026-83828 Heap overflow in Netpbm jbigtopnm can crash the tool or run code CVSS 4.0HIGH 8.5

See all 22 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences