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Vulnerability · Published Nov 2, 2026 · Assigned by VulnCheck

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

High 7.8

In plain English

A high-severity integer overflow in Netpbm from Netpbm. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities).

Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.2%top 92.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12netpbm-freeno fix listedDEBIAN-CVE-2026-120436
Debian:13netpbm-freeno fix listedDEBIAN-CVE-2026-120436
Debian:14netpbm-freeno fix listedDEBIAN-CVE-2026-120436
Ubuntu:22.04:LTSnetpbm-freeno fix listedUBUNTU-CVE-2026-120436
Ubuntu:24.04:LTSnetpbm-freeno fix listedUBUNTU-CVE-2026-120436
Ubuntu:26.04:LTSnetpbm-freeno fix listedUBUNTU-CVE-2026-120436
Ubuntu:26.10netpbm-freeno fix listedUBUNTU-CVE-2026-120436

Affected products (as reported)

VendorProductVersions
Netpbm Netpbm 0 – before 10.86.5111.0 – before 11.02.3011.03 – before 11.15.08

Weakness: CWE-190 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References