Description
libcurl keeps previously used connections in a connection pool for subsequenttransfers to reuse, if one of them matches the setup.Due to errors in the logic, the config matching function did not take 'issuercert' into account and it compared the involved paths *case insensitively*,which could lead to libcurl reusing wrong connections.File paths are, or can be, case sensitive on many systems but not all, and caneven vary depending on used file systems.The comparison also didn't include the 'issuer cert' which a transfer can setto qualify how to verify the server certificate.
Affected products
haxx: libcurl; fedoraproject: fedora; debian: debian linux; netapp: cloud backup; netapp: clustered data ontap; netapp: solidfire \& hci management node; netapp: solidfire baseboard management controller firmware; oracle: mysql server; oracle: peoplesoft enterprise peopletools; siemens: sinec infrastructure network services; siemens: sinema remote connect server; siemens: logo\! cmr2040 firmware; siemens: logo\! cmr2040; siemens: logo\! cmr2020 firmware; siemens: logo\! cmr2020
References10
- cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf PatchThird Party Advisory
- hackerone.com/reports/1223565 ExploitIssue TrackingPatchThird Party Advisory
- www.oracle.com/security-alerts/cpujan2022.html PatchThird Party Advisory
- www.oracle.com/security-alerts/cpuoct2021.html PatchThird Party Advisory
- cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf PatchThird Party Advisory
- hackerone.com/reports/1223565 ExploitIssue TrackingPatchThird Party Advisory
- www.oracle.com/security-alerts/cpujan2022.html PatchThird Party Advisory
- www.oracle.com/security-alerts/cpuoct2021.html PatchThird Party Advisory
- cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf Third Party Advisory
- cert-portal.siemens.com/productcert/pdf/ssa-732250.pdf Third Party Advisory
Metrics
- CVSS 3.1
-
3.7
LOW
Score source: NVD
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N - EPSS — exploit probability
- 6% percentile: 94 · as of 4 November 2026
- CWE
- CWE-20CWE-706
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.