curl Vulnerability Exposes Sensitive Data in Ubuntu Systems

Linuxsecurity

curl Vulnerability Exposes Sensitive Data in Ubuntu Systems

First seen 20 Aug 2026, 11:54 UTC • •57.8

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ThreatCluster •August 21, 2026 at 11:17 UTC

•curl vulnerability allows sensitive data exposure due to improper connection handling.
•Affected Ubuntu versions include 20.04 LTS, 22.04 LTS, 24.04 LTS, and 26.04 LTS.
•Users should update to the latest package versions to mitigate the risk.

A vulnerability in curl, identified as USN-8651-1, allows remote attackers to exploit improper connection handling when the origin changes between transfers. This flaw can lead to the exposure of sensitive information over the network. Affected systems include multiple versions of Ubuntu, specifically 20.04 LTS, 22.04 LTS, 24.04 LTS, and 26.04 LTS, with various package versions listed. Users are advised to update their systems to the latest package versions to mitigate this risk. The vulnerability is classified under CVE-2026-8651. The issue was confirmed by the Ubuntu security team on August 19, 2026, and a standard system update is recommended for remediation.

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Timeline

2026-08-19

curl vulnerability discovered

The Ubuntu security team confirmed that curl mishandles connections, allowing potential data exposure by remote attackers.

2026-08-19

USN-8651-1 advisory published

Ubuntu released an advisory detailing the curl vulnerability and recommended updates for affected systems.

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Threat Graph

4 entities, 3 inferred relationships (STIX 2.1).

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Technique (1)

Data Breach

Organization (1)

Ubuntu

Weakness (1)

CWE-200 - Exposure of Sensitive Information

Affected Platform (1)

Linux

Relationships

Data Breach targets Linux
Data Breach related to Ubuntu
Data Breach related to CWE-200 - Exposure of Sensitive Information

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