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CVE-2026-53689

Quick assessment

Affected
sahlberg libnfs
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

libnfs是Ronnie Sahlberg个人开发者的一个网络文件系统访问客户端库。 libnfs 55c18ea之前版本存在安全漏洞，该漏洞源于未验证字符串大小，可能导致连接到特制NFS服务器时发生整数溢出。此问题发生在lib/libnfs-zdr.c中的libnfs_zdr_string函数中。

CVSS 7.1 · High EPSS 0.35% · P27

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
sahlberg libnfs < 55c18ea33a83d667f79f0ef209c96895795c729f affected
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I. Basic Information for CVE-2026-53689

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
libnfs through 6.0.2 before 55c18ea does not validate a string size, leading to an integer overflow during a connection to a crafted NFS server. This occurs in libnfs_zdr_string in lib/libnfs-zdr.c.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1284
Source: CVE Program / CVE List V5
Vulnerability Title
libnfs 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libnfs是Ronnie Sahlberg个人开发者的一个网络文件系统访问客户端库。 libnfs 55c18ea之前版本存在安全漏洞，该漏洞源于未验证字符串大小，可能导致连接到特制NFS服务器时发生整数溢出。此问题发生在lib/libnfs-zdr.c中的libnfs_zdr_string函数中。
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
sahlberg libnfs 0 ~ 55c18ea33a83d667f79f0ef209c96895795c729f -

II. Public POCs for CVE-2026-53689

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8641 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-53689

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Patches & Fixes for CVE-2026-53689 (1)

IV. Related Vulnerabilities

Same product: libnfs
Same vendor: sahlberg
Same weakness: CWE-1284

V. Comments for CVE-2026-53689

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