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CVE-2026-118446— Use-after-free in INSTRUX array 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.

pybddisasm 的 Python 绑定中存在一个释放后使用（use-after-free）漏洞，该漏洞影响 INSTRUX 对象的数组型成员，包括 ND_OPERAND 数组。这些数组以 Python 列表的形式暴露，其元素引用由父级 INSTRUX 对象所拥有的内存。保留该列表或其元素并不会维持父级分配的内存存活。因此，在父级 INSTRUX 对象被释放后访问其元素，实际上是在访问已被释放的内存。具体后果取决于该元素的使用方式以及已释放的内存是否被重新分配：可能泄露进程内存，或导致 Python 进程崩溃。

CVSS 6.9 · Medium
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I. Basic Information for CVE-2026-118446

Vulnerability Information
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Vulnerability Title
Use-after-free in INSTRUX array members in pybddisasm
Source: CVE Program / CVE List V5
Vulnerability Description
A use-after-free vulnerability in the pybddisasm Python bindings affects array-valued members of INSTRUX objects, including ND_OPERAND arrays. These arrays are exposed as Python lists whose elements reference memory owned by the parent INSTRUX object. Retaining a list or an element does not keep the parent allocation alive. Accessing an element after the parent INSTRUX object has been freed therefore accesses freed memory. Depending on how the element 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 an array element 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 The pybddisasm package is no longer maintained.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-2026-118446

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III. Intelligence Information for CVE-2026-118446

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Other References for CVE-2026-118446 (1)

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

CVE-2026-118448 6.9 MEDIUM Uninitialized output buffer returned after nd_to_text failure in pybddisasm
CVE-2026-118445 6.9 MEDIUM Use-after-free in INSTRUX structure members 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