Netpbm up to 10.86.50/11.02.29/11.15.07 JBIG File jbg_dec_merge_planes integer overflow

Summaryinfo

A vulnerability was found in Netpbm up to 10.86.50/11.02.29/11.15.07 and classified as problematic. Affected is the function jbg_dec_merge_planes of the component JBIG File Handler. The manipulation results in integer overflow. This vulnerability is identified as CVE-2026-120436. The attack is only possible with local access. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Netpbm up to 10.86.50/11.02.29/11.15.07. It has been classified as problematic. Affected is the function jbg_dec_merge_planes of the component JBIG File Handler. The manipulation with an unknown input leads to a integer overflow vulnerability. CWE is classifying the issue as CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at sourceforge.net. This vulnerability is traded as CVE-2026-120436 since 11/02/2026. The exploitability is told to be easy. Local access is required to approach this attack. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit.

Upgrading to version 10.86.51, 11.02.30 or 11.15.08 eliminates this vulnerability.

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Productinfo

Name

• Netpbm

Version

• 10.86.0
• 10.86.1
• 10.86.2
• 10.86.3
• 10.86.4
• 10.86.5
• 10.86.6
• 10.86.7
• 10.86.8
• 10.86.9
• 10.86.10
• 10.86.11
• 10.86.12
• 10.86.13
• 10.86.14
• 10.86.15
• 10.86.16
• 10.86.17
• 10.86.18
• 10.86.19
• 10.86.20
• 10.86.21
• 10.86.22
• 10.86.23
• 10.86.24
• 10.86.25
• 10.86.26
• 10.86.27
• 10.86.28
• 10.86.29
• 10.86.30
• 10.86.31
• 10.86.32
• 10.86.33
• 10.86.34
• 10.86.35
• 10.86.36
• 10.86.37
• 10.86.38
• 10.86.39
• 10.86.40
• 10.86.41
• 10.86.42
• 10.86.43
• 10.86.44
• 10.86.45
• 10.86.46
• 10.86.47
• 10.86.48
• 10.86.49
• 10.86.50
• 11.02.0
• 11.02.1
• 11.02.2
• 11.02.3
• 11.02.4
• 11.02.5
• 11.02.6
• 11.02.7
• 11.02.8
• 11.02.9
• 11.02.10
• 11.02.11
• 11.02.12
• 11.02.13
• 11.02.14
• 11.02.15
• 11.02.16
• 11.02.17
• 11.02.18
• 11.02.19
• 11.02.20
• 11.02.21
• 11.02.22
• 11.02.23
• 11.02.24
• 11.02.25
• 11.02.26
• 11.02.27
• 11.02.28
• 11.02.29
• 11.15.07

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