Authentication Bypass by Capture-replay in cURL - CVE-2026-7168

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Main Vulnerability Database Vulnerabilities #VU128459

Authentication Bypass by Capture-replay in cURL - CVE-2026-7168

Published: April 29, 2026


Vulnerability identifier: #VU128459
CSH Severity: Medium
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-7168
CWE-ID: CWE-294
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to authentication bypass by capture-replay. A remote attacker can leak and reuse Digest proxy authentication state across proxies to impersonate the client.


Affected software

cURL
Ubuntu
openEuler
Anolis OS
Fedora
curl (Ubuntu package)
curl-debuginfo
curl-debugsource
libcurl
libcurl-devel
curl-help
curl
curl-doc
libcurl-minimal
curl-minimal

How to mitigate CVE-2026-7168

Install updates from vendor's website.

cURL - update to 8.20.0
curl (Ubuntu package) - addressed in versions 7.35.0-1ubuntu2.20+esm21, 7.47.0-1ubuntu2.19+esm17, 7.58.0-2ubuntu3.24+esm10, 7.68.0-1ubuntu2.25+esm5, 7.81.0-1ubuntu1.24, 8.5.0-2ubuntu10.9, 8.5.0-2ubuntu10.11, 8.14.1-2ubuntu1.3, 8.14.1-2ubuntu1.5, 8.18.0-1ubuntu2.1, 8.18.0-1ubuntu2.3
curl-debuginfo - addressed in versions 7.71.1-48, 7.79.1-49, 8.4.0-29, 8.4.0-30
curl-debugsource - addressed in versions 7.71.1-48, 7.79.1-49, 8.4.0-29, 8.4.0-30
libcurl - addressed in versions 7.71.1-48, 7.79.1-49, 8.4.0-29, 8.4.0-30
libcurl-devel - addressed in versions 7.71.1-48, 7.79.1-49, 8.4.0-29, 8.4.0-30
curl-help - addressed in versions 7.71.1-48, 7.79.1-49, 8.4.0-29, 8.4.0-30
curl - addressed in versions 7.71.1-48, 7.79.1-49, 8.4.0-29, 8.4.0-30
curl-doc - update to 8.4.0-19
libcurl-minimal - update to 8.4.0-19
libcurl-devel - update to 8.4.0-19
libcurl - update to 8.4.0-19
curl-minimal - update to 8.4.0-19
curl - update to 8.4.0-19
curl - addressed in versions 8.15.0-8.fc43, 8.18.0-8.fc44

External References

Related Security Bulletins