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CVE-2026-118445— Use-after-free in INSTRUX structure members in pybddisasm

Quick assessment

Affected
Bitdefender pybddisasm
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.

Python 绑定中存在一个释放后使用（use-after-free）漏洞，该漏洞影响 对象的结构性成员。这些成员通过引用由父级 对象所拥有内存的 Python 对象暴露出来。对某个成员的保留引用并不会维持其父级内存分配的存活状态。因此，在父级 对象被释放后访问该成员，将导致对已释放内存的访问。根据成员的具体用法以及已释放内存是否已被重新分配，该漏洞可能导致进程内存泄露或引发 Python 进程崩溃。利用此漏洞需要应用程序在父级对象被释放后，仍保留并随后访问该成员的引用。目前， 包已不再维护。

CVSS 6.9 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-118445

Vulnerability Information
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Vulnerability Title
Use-after-free in INSTRUX structure members in pybddisasm
Source: CVE Program / CVE List V5
Vulnerability Description
A use-after-free vulnerability in the pybddisasm Python bindings affects structure-valued members of INSTRUX objects. These members are exposed through Python objects that reference memory owned by the parent INSTRUX object. A retained reference to a member does not keep the parent allocation alive. Accessing the member after the parent INSTRUX object has been freed therefore accesses freed memory. Depending on how the member is used and whether the freed allocation has been reused, this may expose process memory or cause the Python process to crash. Exploitation requires an application to retain and subsequently access a member reference after the parent object has been freed. The pybddisasm package is no longer maintained.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Bitdefender pybddisasm 0 ~ 0.3.0 -

II. Public POCs for CVE-2026-118445

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III. Intelligence Information for CVE-2026-118445

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Other References for CVE-2026-118445 (1)

Same Patch Batch · Bitdefender · 2026-11-03 · 5 CVEs total

CVE-2026-118446 6.9 MEDIUM Use-after-free in INSTRUX array members in pybddisasm
CVE-2026-118448 6.9 MEDIUM Uninitialized output buffer returned after nd_to_text failure in pybddisasm
CVE-2026-118444 4.8 MEDIUM Out-of-bounds reads during instruction decoding in pybddisasm
CVE-2026-118447 4.8 MEDIUM Uninitialized INSTRUX contents returned after decoding failure in pybddisasm

IV. Related Vulnerabilities

Same product: pybddisasm
Same vendor: Bitdefender
Same weakness: CWE-416