VDB-370191 · CVE-2026-53689 · GCVE-0-2026-53689

sahlberg libnfs up to up to 6.0.2 NFS lib/libnfs-zdr.c libnfs_zdr_string improper validation of specified quantity in input

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.9	$0-$5k	3.15-

Summaryinfo

A vulnerability has been found in sahlberg libnfs up to up to 6.0.2 and classified as problematic. This affects the function libnfs_zdr_string in the library lib/libnfs-zdr.c of the component NFS Handler. Performing a manipulation results in improper validation of specified quantity in input. This vulnerability is identified as CVE-2026-53689. The attack can be initiated remotely. There is not any exploit available. It is recommended to apply a patch to fix this issue.

Detailsinfo

A vulnerability, which was classified as problematic, was found in sahlberg libnfs up to up to 6.0.2. This affects the function libnfs_zdr_string in the library lib/libnfs-zdr.c of the component NFS Handler. The manipulation with an unknown input leads to a improper validation of specified quantity in input vulnerability. CWE is classifying the issue as CWE-1284. The product receives input that is expected to specify a quantity (such as size or length), but it does not validate or incorrectly validates that the quantity has the required properties. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-53689 since 06/10/2026. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit.

Applying the patch 55c18ea33a83d667f79f0ef209c96895795c729f is able to eliminate this problem.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

sahlberg

Name

libnfs

Version

Website

Product: https://github.com/sahlberg/libnfs/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.0
VulDB Meta Temp Score: 5.9

VulDB Base Score: 5.0
VulDB Temp Score: 4.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.1
CNA Vector (MITRE): 🔒

CVSSv2info

AV	AC	Au	C	I	A
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Improper validation of specified quantity in input
CWE: CWE-1284 / CWE-703
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: 55c18ea33a83d667f79f0ef209c96895795c729f

Timelineinfo

06/10/2026 Advisory disclosed
06/10/2026 +0 days CVE reserved
06/10/2026 +0 days VulDB entry created
06/10/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: 55c18ea33a83d667f79f0ef209c96895795c729f
Status: Confirmed

CVE: CVE-2026-53689 (🔒)
GCVE (CVE): GCVE-0-2026-53689
GCVE (VulDB): GCVE-100-370191

Entryinfo

Created: 06/10/2026 17:21
Changes: 06/10/2026 17:21 (66)
Complete: 🔍
Cache ID: 216::103