What’s Vulnerable › Vulnerabilities

CVE-2026-3805: use after free in SMB connection reuse

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-11 · updated 2026-09-14
• Weakness: CWE-416

Description

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

Affected products

• curl: from 8.13.0 before 8.19.0 — fixed in 8.19.0

How to fix

Upgrade to a fixed version: curl 8.19.0. Check the vendor advisory for mitigations.

References

• https://curl.se/docs/CVE-2026-3805.html
• https://curl.se/docs/CVE-2026-3805.json
• https://hackerone.com/reports/3591944
• http://www.openwall.com/lists/oss-security/2026/03/11/4

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