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Vulnerability · Published Oct 15, 2026 · Assigned by VulnCheck

CVE-2026-111136libInstPatch through 1.1.7 Heap Out-of-Bounds Write via ipatch_sf2_gen_is_valid

Medium 6.1

In plain English

A medium-severity out-of-bounds write in libinstpatch from swami. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.1Medium
Exploit odds (30 days)0.2%top 90.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

libInstPatch through 1.1.7 contains a heap out-of-bounds write vulnerability in the SoundFont 2 loader because ipatch_sf2_gen_is_valid() does not range-check generator IDs before the validity mask test. Attackers can supply crafted SF2 files with out-of-range pgen or igen generator IDs to write attacker-chosen values past the zone genarray, corrupting heap memory and crashing Swami or other consumers.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12libinstpatchno fix listedDEBIAN-CVE-2026-111136
Debian:13libinstpatchno fix listedDEBIAN-CVE-2026-111136
Debian:14libinstpatch1.1.8-1DEBIAN-CVE-2026-111136
Ubuntu:22.04:LTSlibinstpatchno fix listedUBUNTU-CVE-2026-111136
Ubuntu:24.04:LTSlibinstpatchno fix listedUBUNTU-CVE-2026-111136
Ubuntu:26.04:LTSlibinstpatchno fix listedUBUNTU-CVE-2026-111136
Ubuntu:26.10libinstpatchno fix listedUBUNTU-CVE-2026-111136

Affected products (as reported)

VendorProductVersions
swami libinstpatch 0 – through 1.1.7

Weakness: CWE-787 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H

References