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CVE-2026-90622— GNU libredwg Layer Encoding dwg.spec DWG_TABLE null pointer dereference

Quick assessment

Affected
GNU libredwg
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.

在 GNU libredwg 0.13.4 中发现了一个安全缺陷。该缺陷影响了组件 Layer Encoding 中文件 src/dwg.spec 里的 DWG_TABLE 函数。当执行特定操作时，会引发空指针解引用问题。此漏洞需要本地访问才能利用，且相关的利用代码已公开，可被用于发起攻击。升级到 0.14 版本即可修复此问题，对应的补丁编号为 f5b548c4c1697d66c3dabd0f6a49280a14365a3a。建议将受影响的组件升级至最新版本。 从技术细节来看，FIELD_HANDLE 宏本身具备

CVSS 3.3 · Low

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-90622

Vulnerability Information
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Vulnerability Title
GNU libredwg Layer Encoding dwg.spec DWG_TABLE null pointer dereference
Source: CVE Program / CVE List V5
Vulnerability Description
A security flaw has been discovered in GNU libredwg 0.13.4. This impacts the function DWG_TABLE of the file src/dwg.spec of the component Layer Encoding. Performing a manipulation results in null pointer dereference. The attack needs to be approached locally. The exploit has been released to the public and may be used for attacks. Upgrading to version 0.14 will fix this issue. The patch is named f5b548c4c1697d66c3dabd0f6a49280a14365a3a. The affected component should be upgraded. The FIELD_HANDLE macro itself is NULL-safe (emits null_handle) - only the two raw zeroing assignments added by 27118c40 ("encode: also disable LAYER.material") dereferenced a NULL material handle; the fix restores the file's existing if (_obj->style) guard convention for material.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
GNU libredwg 0.13.4 cpe:2.3:a:gnu:libredwg:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-90622

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III. Intelligence Information for CVE-2026-90622

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Patches & Fixes for CVE-2026-90622 (1)

Vendor Pages for CVE-2026-90622 (2)

Other References for CVE-2026-90622 (1)

Other References for CVE-2026-90622 (1)

IV. Related Vulnerabilities

Same product: libredwg
Same vendor: GNU
Same weakness: CWE-476

V. Comments for CVE-2026-90622

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