cURL up to 8.18.0 SMB Request use after free

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.2$0-$5k0.00

Summaryinfo

A vulnerability classified as critical was found in cURL up to 8.18.0. The affected element is an unknown function of the component SMB Request Handler. Such manipulation leads to use after free. This vulnerability is listed as CVE-2026-3805. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in cURL up to 8.18.0. It has been rated as critical. Affected by this issue is an unknown function of the component SMB Request Handler. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability. CVE summarizes:

When doing a second SMB request to the same host again, curl would wrongly use a data pointer pointing into already freed memory.

The weakness was presented by Daniel Wade. The advisory is available at curl.se. This vulnerability is handled as CVE-2026-3805 since 03/08/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available.

The vulnerability scanner Nessus provides a plugin with the ID 302096 (SUSE SLES15 / openSUSE 15 Security Update : curl (SUSE-SU-2026:0885-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (302096) and CERT Bund (WID-SEC-2026-0690). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

  • Open Source cURL

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.4
VulDB Meta Temp Score: 7.2

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

ADP CISA Base Score: 7.5
ADP CISA Vector: 🔒

CVSSv2info

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

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 302096
Nessus Name: SUSE SLES15 / openSUSE 15 Security Update : curl (SUSE-SU-2026:0885-1)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Timelineinfo

03/08/2026 CVE reserved
03/11/2026 +3 days Advisory disclosed
03/11/2026 +0 days VulDB entry created
03/14/2026 +3 days VulDB entry last update

Sourcesinfo

Advisory: curl.se
Researcher: Daniel Wade
Status: Confirmed

CVE: CVE-2026-3805 (🔒)
GCVE (CVE): GCVE-0-2026-3805
GCVE (VulDB): GCVE-100-350378
CERT Bund: WID-SEC-2026-0690 - cURL: Mehrere Schwachstellen

Entryinfo

Created: 03/11/2026 12:50
Updated: 03/14/2026 06:29
Changes: 03/11/2026 12:50 (55), 03/12/2026 05:12 (7), 03/13/2026 19:06 (2), 03/14/2026 06:29 (12)
Complete: 🔍
Cache ID: 216::103

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

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