PT-2026-35898 · Curl+3 · Curl+3

Daniel Stenberg · Published 2026-04-29 · Updated 2026-06-05 · CVE-2026-7168

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Name of the Vulnerable Software and Affected Versions curl (affected versions not specified)

Description When using libcurl to perform a transfer over a specific HTTP proxy (proxyA) with Digest authentication and subsequently changing the proxy host to a second one (proxyB) while reusing the same handle, libcurl incorrectly sends the Proxy-Authorization: header intended for proxyA to proxyB.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Weakness Enumeration

CWE-294

Related Identifiers

CVE-2026-7168

ECHO-992E-5E26-C10D

OESA-2026-2477

RHSA-2026:19106

USN-8227-1

Affected Products

Linuxmint

Ubuntu

Curl

Libcurl

References · 37

• 🔥 https://hackerone.com/reports/3697719 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-6253 · Security Note
• https://ubuntu.com/security/CVE-2026-7168 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-8227-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-4873 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-12-CVE-2026-7168 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-5545 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-7168 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-6276 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-7168 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2026-7168 · Vendor Advisory
• https://osv.dev/vulnerability/ALPINE-CVE-2026-7168 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-5773 · Vendor Advisory
• https://osv.dev/vulnerability/CURL-CVE-2026-7168 · Vendor Advisory
• http://openwall.com/lists/oss-security/2026/04/29/14 · Patch