Out-of-bounds read in cURL - CVE-2026-107928
Published: October 14, 2026
Vulnerability identifier: #VU155694
CSH Severity: Medium
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-107928
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information or cause a denial of service.
The vulnerability exists due to an out-of-bounds read in curl's WebSocket upload handling with GnuTLS when gnutls_record_send() reports more bytes sent than it was given to send following a blocked send. A remote attacker can operate a malicious WebSocket server to disclose sensitive information or cause a denial of service.
Exploitation requires a TLS send to encounter EAGAIN followed by an automated WebSocket PONG response.
Affected software
cURL
How to mitigate CVE-2026-107928
Install security update from vendor's website.
cURL - update to 8.23.0