CVE-2026-0961

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{"bugzilla": {"description": "Wireshark: Wireshark: Denial of Service vulnerability in BLF file parser", "id": "2429763", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2429763"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["A flaw was found in Wireshark. This vulnerability allows an attacker to trigger a crash in the BLF file parser by providing a specially crafted file. Successful exploitation leads to a denial of service (DoS), making the application unavailable to legitimate users."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, users should avoid opening or processing untrusted BLF (Binary Logging Format) files with Wireshark. Exercise caution when handling BLF files from unknown or unverified sources to prevent potential denial of service attacks."}, "name": "CVE-2026-0961", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "wireshark", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Fix deferred", "package_name": "wireshark", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "wireshark", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "wireshark", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "wireshark", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-01-14T20:23:48Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-0961\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-0961\nhttps://gitlab.com/wireshark/wireshark/-/issues/20880\nhttps://www.wireshark.org/security/wnpa-sec-2026-01.html"], "statement": "This vulnerability is rated Moderate for Red Hat. An out-of-bounds write flaw in the Wireshark BLF file parser can lead to a denial of service. This issue requires user interaction, as an attacker would need to trick a user into opening a specially crafted BLF file.", "threat_severity": "Moderate"}

{"analysis": {"en": {"generated_at": "2026-04-18T06:14:20.634997+00:00", "value": {"mitigation_remediation": ["Upgrade Wireshark to version 4.6.3 or later", "If an upgrade is not possible, disable BLF parsing in Wireshark preferences to prevent processing of potentially malicious files", "Run Wireshark in a sandboxed environment or restrict its ability to open arbitrary files to limit the impact of crashes"], "summary": {"action": "Apply Patch", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "Wireshark Foundation\u2019s Wireshark suffers from this flaw in versions 4.6.0 through 4.6.2 and 4.4.0 through 4.4.12. Any system running one of those releases and that accepts external BLF files is vulnerable.", "description_and_impact": "An out-of-bounds write in the BLF file parser causes Wireshark to crash when it processes a crafted BLF file. The vulnerability is classified as CWE-787 and can cause a denial of service if Wireshark processes a crafted BLF file. The potential attack vector is not explicitly described, but it appears to require malicious file input. No escalation of privileges or remote code execution is described in the available data, so the effect is limited to service interruption.", "risk_and_exploitability": "The CVSS score of 5.5 indicates a medium severity, and the EPSS score of less than 1% suggests a low probability that this weakness will be actively exploited. The issue is not listed in the CISA KEV catalog, further implying limited existing exploitation. The likely attack condition requires a user or an attacker to provide a crafted BLF file to Wireshark, making it most relevant in environments where untrusted files can be opened. Based on the description, the specific origin of the attacker is not explicitly stated."}}}}, "created": "2026-01-15T08:03:15.159278+00:00", "updated": "2026-04-18T06:15:15.877187+00:00", "vendors": ["wireshark", "wireshark$PRODUCT$wireshark"]}