PT-2026-35893 · Curl+3 · Libcurl+3

Daniel Stenberg + 1 · CVE-2026-5773 · Published 2026-04-29 · Updated 2026-07-21

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:C/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-488

CWE-918

Related Identifiers

BDU:2026-09772

CVE-2026-5773

ECHO-73DA-59B1-BEFA

OESA-2026-2477

OPENSUSE-SU-2026:10674-1

RHSA-2026:12916

SUSE-SU-2026:2703-1

USN-8227-1

USN-8525-1

Affected Products

Linuxmint

Red Os

Ubuntu

Libcurl

References · 70

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5773.json · Exploit
• 🔥 https://hackerone.com/reports/3650689 · Exploit
• https://ubuntu.com/security/CVE-2026-11564 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2026-5773 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-10536 · Vendor Advisory
• https://osv.dev/vulnerability/USN-8525-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-6276 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:2703-1 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-5773 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-11352 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-8227-1 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-5773 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-5773 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-4873 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-11-CVE-2026-5773 · Vendor Advisory