PT-2026-35893 · Curl+2 · Libcurl+2

Daniel Stenberg + 1 · Published 2026-04-29 · Updated 2026-06-05 · CVE-2026-5773

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

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

Description A logical error in the connection pooling mechanism may cause libcurl to reuse an incorrect connection for SMB(S) transfers. When reusing a connection, specific criteria must be met; however, a request could wrongfully reuse an existing SMB connection to the same server that utilized a different share than the subsequent transfer requires. This may result in downloading the wrong file or uploading a file to an incorrect location, provided the same credentials and server name are used.

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

Exploit

SSRF

Weakness Enumeration

CWE-918

CWE-488

Related Identifiers

CVE-2026-5773

ECHO-73DA-59B1-BEFA

OESA-2026-2477

OPENSUSE-SU-2026:10674-1

RHSA-2026:12916

USN-8227-1

Affected Products

Linuxmint

Ubuntu

Libcurl

References · 43

• 🔥 https://hackerone.com/reports/3650689 · Exploit
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-12-CVE-2026-5773 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-5773 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-5773 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-7168 · Security Note
• https://osv.dev/vulnerability/CURL-CVE-2026-5773 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-5773 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-6253 · Security Note
• https://osv.dev/vulnerability/OESA-2026-2477 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-5773 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2026-5773 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-5545 · Security Note
• https://ubuntu.com/security/CVE-2026-6429 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-5773 · Security Note
• https://ubuntu.com/security/CVE-2026-6253 · Vendor Advisory