DTLS Plugin - CraftedSignal Threat Feedhttps://feed.craftedsignal.io/products/dtls-plugin/Trending threats, MITRE ATT&CK coverage, and detection metadata. Fed continuously.Hugoenhello@craftedsignal.iohello@craftedsignal.ioThu, 09 Jul 2026 11:22:12 +0000CVE-2026-59692: GStreamer DTLS Plugin Stack Buffer Overflow Leading to DoShttps://feed.craftedsignal.io/briefs/2026-07-gstreamer-dtls-dos/Thu, 09 Jul 2026 11:22:12 +0000hello@craftedsignal.iohttps://feed.craftedsignal.io/briefs/2026-07-gstreamer-dtls-dos/A stack buffer overflow vulnerability, CVE-2026-59692, exists in GStreamer's DTLS plugin, allowing a remote unauthenticated attacker to cause a denial of service by sending a crafted certificate with an oversized Subject Distinguished Name during a DTLS handshake, which the plugin prints into a fixed-size stack buffer without bounds checking, leading to a process crash.A significant denial-of-service vulnerability, CVE-2026-59692, has been identified in the DTLS plugin of GStreamer, a multimedia framework. This flaw allows a remote, unauthenticated attacker to crash any application or service utilizing the vulnerable plugin during a DTLS handshake. The vulnerability stems from a stack buffer overflow where the peer certificate's Subject Distinguished Name (DN) is copied into a fixed 2048-byte stack buffer without proper bounds checking. By presenting a specially crafted certificate containing an excessively long Subject DN, attackers can overwrite adjacent memory on the stack, leading to an immediate process crash and service interruption. This issue was publicly disclosed on July 9, 2026, and primarily impacts systems running GStreamer with the DTLS plugin, including various versions of Red Hat Enterprise Linux. This vulnerability is critical for defenders as it enables complete service disruption without requiring authentication or complex attack vectors.

Attack Chain

  1. A remote unauthenticated attacker identifies a system or application using GStreamer with the vulnerable DTLS plugin.
  2. The attacker crafts a malicious DTLS peer certificate where the Subject Distinguished Name (DN) field is intentionally oversized, exceeding 2048 bytes.
  3. The attacker initiates a DTLS handshake with the targeted vulnerable system or application.
  4. During the handshake process, the GStreamer DTLS plugin receives the attacker's crafted certificate.
  5. The plugin attempts to print the oversized Subject DN from the certificate into a fixed-size 2048-byte stack buffer.
  6. Due to the absence of bounds checking, the oversized Subject DN overflows the allocated stack buffer.
  7. The buffer overflow corrupts adjacent memory on the stack, leading to a critical program error.
  8. The vulnerable process crashes, resulting in a denial-of-service condition for the affected application or system.

Impact

The successful exploitation of CVE-2026-59692 leads directly to a denial-of-service (DoS) condition. Any application or service relying on the vulnerable GStreamer DTLS plugin will crash upon receiving a specially crafted DTLS handshake from an attacker. This can significantly disrupt critical services, leading to operational downtime, financial losses, and reputational damage. While specific victim counts or targeted sectors are not detailed, any organization leveraging GStreamer for multimedia streaming with DTLS capabilities is potentially at risk, including those running Red Hat Enterprise Linux distributions. The unauthenticated and remote nature of the attack makes it a severe threat.

Recommendation

  • Prioritize patching CVE-2026-59692 on all affected GStreamer DTLS plugin installations to prevent denial-of-service.
  • Review the referenced merge request at https://gitlab.freedesktop.org/gstreamer/gstreamer-security/-/merge_requests/99 for official patch details and apply immediately.
  • Consult Red Hat's security advisory at https://access.redhat.com/security/cve/CVE-2026-59692 for specific updates related to Red Hat Enterprise Linux versions.
  • Monitor systems for unexpected crashes or restarts of services utilizing the GStreamer DTLS plugin, which could indicate exploitation attempts.
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