{"id":"CVE-2026-76919","title":"wireshark: Wireshark: Denial of Service vulnerability in ESS protocol dissector (CVE-2026-76919)","summary":"A flaw was found in Wireshark. A remote attacker could exploit a denial of service vulnerability in the ESS protocol dissector by processing a specially crafted network packet. This could lead to the application crashing, preventing networ…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-457","vendor":"Red Hat","product":"Red Hat Enterprise Linux AppStream (v. 8)","affected":["enterprise_linux 6","enterprise_linux 7","enterprise_linux_appstream_v_10","enterprise_linux_appstream_v_8","enterprise_linux_appstream_v_9","enterprise_linux_codeready_linux_builder_v_10","enterprise_linux_crb_v_8","enterprise_linux_codeready_linux_builder_v_9"],"patched":["enterprise_linux_appstream_v_10","enterprise_linux_appstream_v_8","enterprise_linux_appstream_v_9","enterprise_linux_codeready_linux_builder_v_10","enterprise_linux_crb_v_8","enterprise_linux_codeready_linux_builder_v_9"],"published":"2026-08-19","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:23:59+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-76919.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-76919.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-76919"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2520093"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-76919"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-76919"},{"url":"https://gitlab.com/wireshark/wireshark/-/work_items/21467"},{"url":"https://www.wireshark.org/security/wnpa-sec-2026-86.html"},{"url":"https://access.redhat.com/errata/RHSA-2026:84721"},{"url":"https://access.redhat.com/errata/RHSA-2026:83657"},{"url":"https://access.redhat.com/errata/RHSA-2026:83546"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00312,"epssPercentile":0.23892,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-08-20T15:07:55.554982Z"},"scores":{"vendor":6.5,"cna":5.3},"ingestedAt":"2026-09-17T19:26:25.339Z","slug":"CVE-2026-76919","body":"## Overview\n\nA flaw was found in Wireshark. A remote attacker could exploit a denial of service vulnerability in the ESS protocol dissector by processing a specially crafted network packet. This could lead to the application crashing, preventing network traffic analysis. The impact is limited to the availability of the Wireshark application itself.\n\n## Vendor advisories\n\n- **RHSA-2026:84721** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-10-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:84721)\n- **RHSA-2026:83657** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-10-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:83657)\n- **RHSA-2026:83546** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) · released 2026-10-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:83546)\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7 · updated 2026-10-19 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-76919.json)\n\n**wireshark: Wireshark: Denial of Service vulnerability in ESS protocol dissector** — rated Moderate by Red Hat. Released 2026-08-19, updated 2026-10-19.\n\nAffected:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n\nFixed:\n\n- Red Hat Enterprise Linux AppStream (v. 10)\n- Red Hat Enterprise Linux AppStream (v. 8)\n- Red Hat Enterprise Linux AppStream (v. 9)\n- Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)\n- Red Hat Enterprise Linux CRB (v. 8)\n- Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n\n## Remediation\n\nFor details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:84721\nFor details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:83657\nFor details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:83546\n\nWorkarounds / mitigations:\n\n- To mitigate this issue prior to patching, disable the ESS protocol dissector by running tshark --disable-protocol ess or unchecking ESS under Analyze > Enabled Protocols. Additionally, avoid opening packet capture files from untrusted sources and restrict live capture to trusted networks using host firewalls. On systems where packet analysis is non-essential, remove the wireshark package entirely or restrict execution permissions strictly to authorized administrators.","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":224889,"id":"CVE-2026-76919","ts":1792411719554,"field":"cvss","old":"5.3","new":"6.5"}]}