VDB-360235 · CVE-2026-5545 · Nessus 311003

cURL up to 8.19.0 HTTP Negotiate Connection Remote Code Execution

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.
5.4	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in cURL up to 8.19.0. The impacted element is an unknown function of the component HTTP Negotiate Connection Handler. This manipulation causes Remote Code Execution. This vulnerability is registered as CVE-2026-5545. Remote exploitation of the attack is possible. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in cURL up to 8.19.0. Affected by this vulnerability is an unknown functionality of the component HTTP Negotiate Connection Handler. The manipulation with an unknown input leads to a remote code execution vulnerability. As an impact it is known to affect confidentiality, integrity, and availability.

It is possible to read the advisory at seclists.org. This vulnerability is known as CVE-2026-5545. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 311003 (Linux Distros Unpatched Vulnerability : CVE-2026-5545), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 8.20.0 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (311003) and CERT Bund (WID-SEC-2026-1307). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

Red Hat Enterprise Linux
Ubuntu Linux
SUSE Linux
SUSE openSUSE
Open Source cURL

Productinfo

Type

Network Utility Software

Name

cURL

Version

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.4

VulDB Base Score: 5.6
VulDB Temp Score: 5.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Remote Code Execution
CWE: Unknown
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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

Nessus ID: 311003
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-5545

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: cURL 8.20.0

Timelineinfo

04/30/2026 Advisory disclosed
04/30/2026 +0 days VulDB entry created
05/13/2026 +13 days VulDB entry last update

Sourcesinfo

Advisory: seclists.org
Status: Confirmed

CVE: CVE-2026-5545 (🔒)
GCVE (CVE): GCVE-0-2026-5545
GCVE (VulDB): GCVE-100-360235
CERT Bund: WID-SEC-2026-1307 - cURL: Mehrere Schwachstellen

Entryinfo

Created: 04/30/2026 07:02
Updated: 05/13/2026 20:01
Changes: 04/30/2026 07:02 (50), 04/30/2026 07:11 (7), 04/30/2026 13:04 (2), 05/13/2026 20:01 (1)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.