Executive brief
GStreamer is a widely used multimedia framework for processing audio and video streams. A security flaw in its DTLS plugin allows a remote attacker to crash applications using the library by sending a specially crafted security certificate during a connection attempt. This results in a denial of service, potentially disrupting video calls or streaming services, though it does not appear to allow for data theft or full system takeover.
Technical details
A stack-based buffer overflow (CWE-121) exists in the openssl_verify_callback() function within GStreamer's DTLS plugin (gst-plugins-bad). The vulnerability occurs when the peer certificate's Subject Distinguished Name (DN) is printed into a fixed-size 2048-byte stack buffer using X509_NAME_print_ex() and BIO_read() without proper bounds checking. An unauthenticated remote attacker can trigger this by presenting a certificate with an oversized Subject DN during a DTLS-SRTP or WebRTC handshake. While the overflow can cause a process crash (DoS), exploitability for remote code execution is limited by stack canaries and the fact that the overflow content is escaped to printable ASCII. A fix is planned for GStreamer version 1.28.5.
Affected products
- Red Hat gst-plugins-bad-free Enterprise Linux 6, 7, 8, 9, 10
- GStreamer gst-plugins-bad 1.28.3
Timeline
- 2026-07-06: disclosed: Reported to Red Hat Bugzilla
- 2026-07-09: advisory: NVD publication date
References
- https://access.redhat.com/downloads/content/package-browser/
- https://access.redhat.com/security/cve/CVE-2026-59692
- https://bugzilla.redhat.com/show_bug.cgi?id=2497344
- https://gitlab.freedesktop.org/gstreamer/gstreamer-security/-/merge_requests/99
- https://gitlab.freedesktop.org/gstreamer/gstreamer/-/work_items/5172