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

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

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.

cURL
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Micro for Rancher
Ubuntu
Basesystem Module
openSUSE Leap
openEuler
Anolis OS
Fedora
LANTIME Operating System Firmware (LTOS)
curl (Ubuntu package)
curl
curl-debuginfo
curl-debugsource
libcurl
libcurl-devel
curl-help
libcurl4-debuginfo-32bit
libcurl4
libcurl4-debuginfo
libcurl4-32bit
curl-minimal
libcurl-minimal
curl-doc
libcurl-mini4-debuginfo
libcurl-mini4
libcurl4-32bit-debuginfo
libcurl-devel-32bit
curl-mini-debugsource
curl-fish-completion
curl-zsh-completion
libcurl-devel-doc
libcurl4-64bit-debuginfo
libcurl-devel-64bit
libcurl4-64bit

Install updates from vendor's website.

cURL - update to 8.20.0
LANTIME Operating System Firmware (LTOS) - update to 7.10.012
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 - addressed in versions 7.71.1-48, 7.79.1-49, 8.4.0-29, 8.4.0-30
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
libcurl4-debuginfo-32bit - update to 8.0.1-11.126.1
curl-debuginfo - addressed in versions 8.0.1-11.126.1, 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1, 8.14.1-150700.7.23.1
libcurl4 - addressed in versions 8.0.1-11.126.1, 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1, 8.14.1-150700.7.23.1
libcurl4-debuginfo - addressed in versions 8.0.1-11.126.1, 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1, 8.14.1-150700.7.23.1
libcurl-devel - addressed in versions 8.0.1-11.126.1, 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1, 8.14.1-150700.7.23.1
curl - addressed in versions 8.0.1-11.126.1, 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1, 8.14.1-150700.7.23.1
curl-debugsource - addressed in versions 8.0.1-11.126.1, 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1, 8.14.1-150700.7.23.1
libcurl4-32bit - addressed in versions 8.0.1-11.126.1, 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1, 8.14.1-150700.7.23.1
curl - update to 8.4.0-19
curl-minimal - update to 8.4.0-19
libcurl - update to 8.4.0-19
libcurl-devel - update to 8.4.0-19
libcurl-minimal - update to 8.4.0-19
curl-doc - update to 8.4.0-19
libcurl-mini4-debuginfo - addressed in versions 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1
libcurl-mini4 - addressed in versions 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1
libcurl4-32bit-debuginfo - addressed in versions 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1, 8.14.1-150700.7.23.1
libcurl-devel-32bit - addressed in versions 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1
curl-mini-debugsource - addressed in versions 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1
curl-fish-completion - addressed in versions 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1
curl-zsh-completion - addressed in versions 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1
libcurl-devel-doc - addressed in versions 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1
libcurl4-64bit-debuginfo - addressed in versions 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1
libcurl-devel-64bit - addressed in versions 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1
libcurl4-64bit - addressed in versions 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1
curl - addressed in versions 8.15.0-8.fc43, 8.18.0-8.fc44

• https://curl.se/docs/CVE-2026-7168.html

• Multiple vulnerabilities in curl
• Ubuntu update for curl
• openEuler 20.03 LTS SP4 update for curl
• openEuler 24.03 LTS SP3 update for curl
• openEuler 24.03 LTS update for curl
• openEuler 22.03 LTS SP4 update for curl
• Anolis OS update for curl
• openEuler 24.03 LTS SP1 update for curl
• Ubuntu update for curl
• Fedora 44 update for curl
• Fedora 43 update for curl
• Multiple vulnerabilities in Meinberg LANTIME Operating System Firmware
• SUSE update for curl
• SUSE update for curl
• SUSE update for curl
• SUSE update for curl