VDB-360234 · CVE-2026-4873 · Nessus 312298

cURL up to 8.19.0 TLS Requirement missing cryptographic step

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.
3.6	$0-$5k	0.00

Summaryinfo

A vulnerability classified as problematic was found in cURL up to 8.19.0. The affected element is an unknown function of the component TLS Requirement Handler. The manipulation results in missing cryptographic step. This vulnerability is cataloged as CVE-2026-4873. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic has been found in cURL up to 8.19.0. Affected is an unknown function of the component TLS Requirement Handler. The manipulation with an unknown input leads to a missing cryptographic step vulnerability. CWE is classifying the issue as CWE-325. The product does not implement a required step in a cryptographic algorithm, resulting in weaker encryption than advertised by the algorithm. This is going to have an impact on integrity.

The advisory is available at seclists.org. This vulnerability is traded as CVE-2026-4873. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1600 by the MITRE ATT&CK project.

The vulnerability scanner Nessus provides a plugin with the ID 312298 (Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : curl vulnerabilities (USN-8227-1)), 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 (312298) and CERT Bund (WID-SEC-2026-1307). If you want to get best quality of vulnerability data, you may have to visit VulDB.

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: 3.7
VulDB Meta Temp Score: 3.6

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
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: Missing cryptographic step
CWE: CWE-325
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: 312298
Nessus Name: Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : curl vulnerabilities (USN-8227-1)

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-2026-4873 (🔒)
GCVE (CVE): GCVE-0-2026-4873
GCVE (VulDB): GCVE-100-360234
CERT Bund: WID-SEC-2026-1307 - cURL: Mehrere Schwachstellen

Entryinfo

Created: 04/30/2026 07:02
Updated: 05/13/2026 15:31
Changes: 04/30/2026 07:02 (51), 04/30/2026 07:11 (7), 05/06/2026 15:09 (2), 05/13/2026 15:31 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.