cURL up to 8.19.0 OCSP Stapling certificate validation

CVSS Meta Temp Score
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CTI Interest Score
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3.6$0-$5k0.00

Summaryinfo

A vulnerability was found in cURL up to 8.19.0. It has been declared as critical. This issue affects some unknown processing of the component OCSP Stapling Handler. Executing a manipulation can lead to certificate validation. This vulnerability is registered as CVE-2026-7009. It is possible to launch the attack remotely. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in cURL up to 8.19.0. This vulnerability affects some unknown processing of the component OCSP Stapling Handler. The manipulation with an unknown input leads to a certificate validation vulnerability. The CWE definition for the vulnerability is CWE-295. The product does not validate, or incorrectly validates, a certificate. As an impact it is known to affect integrity.

The weakness was published by Daniel Stenberg. The advisory is shared for download at seclists.org. This vulnerability was named CVE-2026-7009. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1587.003.

The vulnerability scanner Nessus provides a plugin with the ID 311424 (Curl 8.17.0 < 8.20.0 OCSP Stapling Bypass), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 8.20.0 eliminates this vulnerability. The upgrade is hosted for download at curl.se. Applying the patch 51905671e07f087e28e57 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (311424), EUVD (EUVD-2026-29931) and CERT Bund (WID-SEC-2026-1307). Once again VulDB remains the best source for vulnerability data.

Affected

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

Productinfo

Type

Name

Version

License

Website

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

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

Exploitinginfo

Class: Certificate validation
CWE: CWE-295 / CWE-287
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: 311424
Nessus Name: Curl 8.17.0 < 8.20.0 OCSP Stapling Bypass

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: cURL 8.20.0
Patch: 51905671e07f087e28e57

Timelineinfo

04/29/2026 Advisory disclosed
04/29/2026 +0 days VulDB entry created
05/13/2026 +14 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: seclists.org
Researcher: Daniel Stenberg
Status: Confirmed
Confirmation: 🔒

CVE: CVE-2026-7009 (🔒)
GCVE (CVE): GCVE-0-2026-7009
GCVE (VulDB): GCVE-100-360100
EUVD: 🔒
CERT Bund: WID-SEC-2026-1307 - cURL: Mehrere Schwachstellen

Entryinfo

Created: 04/29/2026 09:45
Updated: 05/13/2026 20:01
Changes: 04/29/2026 09:45 (57), 04/29/2026 19:39 (7), 05/01/2026 23:45 (2), 05/13/2026 14:01 (1), 05/13/2026 20:01 (1)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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