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CVE-2026-9503— GNU LibreDWG DWG File decode.c dwg_next_entity 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.

GNU LibreDWG是美国GNU社区的一个用于处理DWG文件的C语言库。 GNU LibreDWG 0.14版本及之前版本存在代码问题漏洞，该漏洞源于DWG File Handler组件中src/decode.c文件的dwg_next_entity函数存在空指针取消引用，可能导致本地攻击者利用该漏洞。

CVSS 3.3 · Low EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1055 · Process Injection

Affected Version Matrix 14

VendorProduct Version RangeStatus
GNU LibreDWG 0.1 affected
0.2 affected
0.3 affected
0.4 affected
0.5 affected
0.6 affected
0.7 affected
0.8 affected
… +6 more rows
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I. Basic Information for CVE-2026-9503

Vulnerability Information
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Vulnerability Title
GNU LibreDWG DWG File decode.c dwg_next_entity null pointer dereference
Source: CVE Program / CVE List V5
Vulnerability Description
A security flaw has been discovered in GNU LibreDWG up to 0.14. This impacts the function dwg_next_entity of the file src/decode.c of the component DWG File Handler. The manipulation results in null pointer dereference. The attack must be initiated from a local position. The exploit has been released to the public and may be used for attacks. The patch is identified as 8f03865f37f5d4ffd616fef802acc980be54d300. Upgrading the affected component is advised.
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
Vulnerability Title
GNU LibreDWG 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GNU LibreDWG是美国GNU社区的一个用于处理DWG文件的C语言库。 GNU LibreDWG 0.14版本及之前版本存在代码问题漏洞，该漏洞源于DWG File Handler组件中src/decode.c文件的dwg_next_entity函数存在空指针取消引用，可能导致本地攻击者利用该漏洞。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
GNU LibreDWG 0.1 cpe:2.3:a:gnu:libredwg:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-9503

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III. Intelligence Information for CVE-2026-9503

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Patches & Fixes for CVE-2026-9503 (1)

Vendor Pages for CVE-2026-9503 (1)

Other References for CVE-2026-9503 (2)

Same Patch Batch · GNU · 2026-05-25 · 5 CVEs total

CVE-2026-9500 5.3 MEDIUM GNU LibreDWG Dwgread Utility decode.c read_2004_compressed_section heap-based overflow
CVE-2026-9502 5.3 MEDIUM GNU LibreDWG Dwgread Utility decode.c decompress_R2004_section heap-based overflow
CVE-2026-9501 3.3 LOW GNU LibreDWG Dwgread Utility decode.c decompress_R2004_section assertion
CVE-2026-9504 3.3 LOW GNU LibreDWG Dwggrep Utility dwggrep.c bit_convert_TU out-of-bounds

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-9503

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