PT-2026-51743 · Libcurl+3 · Libcurl+3

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CVE-2026-11856

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Published

2026-06-24

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Updated

2026-08-26

CVSS v3.1

9.8

Critical

VectorAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Name of the Vulnerable Software and Affected Versions libcurl (affected versions not specified)
Description When performing a transfer to a specific HTTP origin (hostA) using Digest authentication and subsequently changing the origin to a different one (hostB) while reusing the same handle, libcurl incorrectly forwards the Authorization: header intended for hostA to hostB.
Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

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Weakness Enumeration

Related Identifiers

AZL-91803
AZL-91830
CVE-2026-11856
ECHO-895D-0FCF-45BD
JLSEC-2026-1201
OPENSUSE-SU-2026:11230-1
RHSA-2026:34975
USN-8651-1

Affected Products

Ibm Aix
Linuxmint
Ubuntu
Libcurl