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A stack buffer overflow was found in GStreamer's DTLS plugin (gst-plugins-bad). In openssl_verify_callback(), the peer certificate Subject DN is printed using X509_NAME_print_ex() into a memory BIO, then read via BIO_read() into a fixed gchar buf[2048] on the stack. The number of bytes read comes directly from the X509_NAME_print_ex() return value without bounds checking against the buffer size. A remote DTLS peer can send a certificate with an oversized Subject DN (many long OU fields) so that the formatted output exceeds 2048 bytes, causing a stack buffer overflow during the DTLS handshake. File: subprojects/gst-plugins-bad/ext/dtls/gstdtlsconnection.c Function: openssl_verify_callback() (lines 1136-1144) Exploitability analysis: - The overflow content is TEXT ONLY (X509_NAME_print_ex with XN_FLAG_MULTILINE escapes all binary/control characters to printable ASCII sequences like \XX) - Stack canary (-fstack-protector-strong) terminates the process before return address corruption is exploitable - Arbitrary byte injection is impossible: null bytes become \00 (3 printable chars), high-bit bytes become \XX - RCE is NOT achievable. Maximum impact is denial of service (crash) Attack vector: Unauthenticated remote DTLS-SRTP/WebRTC peer triggers this during handshake by presenting a crafted certificate. No user interaction required. Affected: GStreamer gst-plugins-bad (reproduced on 1.28.3) Fixed: Planned for GStreamer 1.28.5 Fix MR: https://gitlab.freedesktop.org/gstreamer/gstreamer-security/-/merge_requests/99 Upstream issue: https://gitlab.freedesktop.org/gstreamer/gstreamer/-/work_items/5172 (confidential) Advisory: GST-SA-2026-0062 Reporter: Clouditera Security; Z.ai Security; NSFOCUS PSIRT Ticket: PSIRTSUPT-19090
This issue has been addressed in the following products: Red Hat Enterprise Linux 10 Via RHSA-2026:47180 https://access.redhat.com/errata/RHSA-2026:47180
This issue has been addressed in the following products: Red Hat Enterprise Linux 9 Via RHSA-2026:47179 https://access.redhat.com/errata/RHSA-2026:47179
This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2026:47731 https://access.redhat.com/errata/RHSA-2026:47731
This issue has been addressed in the following products: Red Hat Enterprise Linux 10.0 Extended Update Support Via RHSA-2026:54659 https://access.redhat.com/errata/RHSA-2026:54659
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.6 Extended Update Support Via RHSA-2026:54660 https://access.redhat.com/errata/RHSA-2026:54660
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Via RHSA-2026:54658 https://access.redhat.com/errata/RHSA-2026:54658
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Via RHSA-2026:54665 https://access.redhat.com/errata/RHSA-2026:54665
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Red Hat Enterprise Linux 8.8 Telecommunications Update Service Via RHSA-2026:54664 https://access.redhat.com/errata/RHSA-2026:54664
This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Extended Lifecycle Support Via RHSA-2026:54752 https://access.redhat.com/errata/RHSA-2026:54752
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Via RHSA-2026:56658 https://access.redhat.com/errata/RHSA-2026:56658
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Via RHSA-2026:56772 https://access.redhat.com/errata/RHSA-2026:56772