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

Quick assessment

Affected
swami libinstpatch
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

libInstPatch 1.1.7 及更早版本存在堆缓冲区越界写入漏洞，问题出现在 SoundFont 2 (SF2) 格式加载器中。原因是函数 在执行有效性掩码检查之前，未对生成器 ID（generator IDs）进行范围检查。攻击者可以通过构造包含超出范围的 pgen 或 igen 生成器 ID 的恶意 SF2 文件，向 zone genarray 之后的内存区域写入任意值，从而破坏堆内存，导致 Swami 或其他使用该库的应用程序崩溃。

CVSS 6.1 · Medium EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
swami libinstpatch ≤ 1.1.7 affected
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I. Basic Information for CVE-2026-111136

Vulnerability Information
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Vulnerability Title
libInstPatch through 1.1.7 Heap Out-of-Bounds Write via ipatch_sf2_gen_is_valid
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
swami libinstpatch 0 ~ 1.1.7 -

II. Public POCs for CVE-2026-111136

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-111136

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Patches & Fixes for CVE-2026-111136 (1)

Vendor Advisories for CVE-2026-111136 (1)

IV. Related Vulnerabilities

Same weakness: CWE-787

V. Comments for CVE-2026-111136

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