curl: TLS session cache ignores CURLOPT_SSL_CTX_FUNCTION identity and resumes one client's session for another

Researcher: Maturi Jaswanth Sai Program: curl HackerOne Asset: github.com/curl/curl, lib/vtls/vtlsscache.c Affected: curl 8.21.0, 8.22.0 and 8.23.0 tag curl-8230, 2026-10-14, plus master eb2b201a 8.23.1-DEV, 2026-10-19 Weakness: CWE-295, wrong client identity on a resumed TLS session. Same class ...

CVE-2026-105236

A flaw was found in Erlang/OTP. This issue allows a remote attacker to bypass authentication and gain unauthorized access to protected services. When multiple virtual hosts share a listener, the Transport Layer Security TLS session cache does not bind cached sessions to the specific Server Name...

curl: TLS session cache key omits native_ca_store: a session validated with CURLSSLOPT_NATIVE_CA can be resumed by a transfer that disabled it (incomplete f

Summary CVE-2026-11564 fixed the connection pool so that a connection whose certificate was validated with the native CA store is not reused by a later transfer that switched to custom CA material. That same field, nativecastore, is compared for connection reuse but is NOT part of the TLS session...

curl: CVE-2026-111950: TLS session cache diff scheme reuse

Summary curl 8.12.0 through 8.23.0 can reuse a TLS session created for an FTPS connection when opening an HTTPS connection to the same hostname and port. The TLS session-cache key contains the hostname, port, transport, TLS backend, and TLS configuration, but it does not contain the URL scheme or...

CVE-2026-15924 Use-after-free / double-free from unsynchronized concurrent access to the TLS client session cache in Zephyr sockets

Zephyr's TLS socket layer in subsys/net/lib/sockets/socketstls.c keeps a single process-global array, clientcache, of cached client sessions that is shared by every TLS socket context. The functions that mutate and read it — tlssessionsave, tlssessionget, tlssessioncachereset, and the settings...

CVE-2026-15924

Zephyr RTOS TLS socket layer contains a use-after-free and double-free vulnerability in the process-global client_cache array shared across all TLS socket contexts. The root cause is that the per-socket mutex (ctx->lock) provides no mutual exclusion between different sockets concurrently acces...

curl: TLS session cache case-folds CA paths and bypasses the active trust profile

curl 8.21.0 case-folds the entire TLS session-cache peer key, so two distinct CA files whose Unix paths differ only by case can share a TLS session ticket. At lib/vtls/vtlsscache.c:723, curlstrequal compares keys that include case-sensitive CA, CRL, and issuer paths, even though...

CVE-2026-9545

In this scenario, libcurl first uses a proper HTTP/3 server for the initial transfers, and when it makes a second transfer to the same site it has been replaced by the attacker's impostor machine - without a valid certificate. When libcurl returns to the hostname the second time with a cached SSL...

EUVD-2026-34324

A potential out-of-bounds write/read exists in the TLS socket connect path of the network sockets subsystem subsys/net/lib/sockets/socketstls.c. When the TLS session cache is enabled, tlssessionstore and tlssessionrestore memcpy the caller-supplied address into a fixed-size buffer using the...

CVE-2026-5066 net: sockets: tls: Potential out-of-bounds write/read in socket_op_vtable::connect function

A potential out-of-bounds write/read exists in the TLS socket connect path of the network sockets subsystem subsys/net/lib/sockets/socketstls.c. When the TLS session cache is enabled, tlssessionstore and tlssessionrestore memcpy the caller-supplied address into a fixed-size buffer using the...

EUVD-2017-18086

Malware in sbrugna...

Huawei EulerOS: Security Advisory for freeradius (EulerOS-SA-2017-1134)

The remote host is missing an update for the Huawei EulerOS SPDX-FileCopyrightText: 2020 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only ifdescription...

Huawei EulerOS: Security Advisory for freeradius (EulerOS-SA-2017-1135)

The remote host is missing an update for the Huawei EulerOS SPDX-FileCopyrightText: 2020 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only ifdescription...

EulerOS 2.0 SP2 : freeradius (EulerOS-SA-2017-1135)

According to the version of the freeradius package installed, the EulerOS installation on the remote host is affected by the following vulnerability : - The TLS session cache in FreeRADIUS 2.1.1 through 2.1.7, 3.0.x before 3.0.14, 3.1.x before 2017-02-04, and 4.0.x before 2017-02-04 fails to...

EulerOS 2.0 SP1 : freeradius (EulerOS-SA-2017-1134)

According to the version of the freeradius package installed, the EulerOS installation on the remote host is affected by the following vulnerability : - The TLS session cache in FreeRADIUS 2.1.1 through 2.1.7, 3.0.x before 3.0.14, 3.1.x before 2017-02-04, and 4.0.x before 2017-02-04 fails to...

BSA-2017-342

Security Advisory ID : BSA-2017-342 Component : Freeradius Revision : 2.0: Interim The TLS session cache inFreeRADIUS2.1.1 through 2.1.7, 3.0.x before 3.0.14, 3.1.x before 2017-02-04, and 4.0.x before 2017-02-04 fails to reliably prevent resumption of an unauthenticated session, which allows remo...

USN-3316-1: FreeRADIUS vulnerability

Stefan Winter and Luboš Pavlíček discovered that FreeRADIUS incorrectly handled the TLS session cache. A remote attacker could possibly use this issue to bypass authentication by resuming an unauthenticated session...

[SECURITY] [DLA 977-1] freeradius security update

Package : freeradius Version : 2.1.12+dfsg-1.2+deb7u1 CVE ID : CVE-2014-2015 CVE-2015-4680 CVE-2017-9148 Debian Bug : 742820 789623 863673 Several issues were discovered in FreeRADIUS, a high-performance and highly configurable RADIUS server. CVE-2014-2015 A stack-based buffer overflow was found ...

CVE-2017-9148

The TLS session cache in FreeRADIUS 2.1.1 through 2.1.7, 3.0.x before 3.0.14, 3.1.x before 2017-02-04, and 4.0.x before 2017-02-04 fails to reliably prevent resumption of an unauthenticated session, which allows remote attackers such as malicious 802.1X supplicants to bypass authentication via PE...

Authentication flaw

The TLS session cache in FreeRADIUS 2.1.1 through 2.1.7, 3.0.x before 3.0.14, 3.1.x before 2017-02-04, and 4.0.x before 2017-02-04 fails to reliably prevent resumption of an unauthenticated session, which allows remote attackers such as malicious 802.1X supplicants to bypass authentication via PE...