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CVE-2026-76889 Wireshark Foundation CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-08-19T23:16:19.953Z and has not been modified since then. The UMTS FP protocol dissector in Wireshark versions 4.6.0 to 4.6.7 and 4.4.0 to 4.4.18 is vulnerable to a denial of service attack. This vulnerability is due to a crash in the dissector when processing certain protocol packets. An attacker could potentially exploit this vulnerability by sending specially crafted packets to a vulnerable Wireshark installation, causing the dissector to crash and potentially leading to a denial of service. Network administrators and security teams should verify the integrity of their Wireshark installations and apply patches or updates as recommended by the vendor. The vulnerability has a CVSS score of 4.7 and a severity of MEDIUM.

Vendor
Wireshark Foundation
Product
Wireshark
CVSS
MEDIUM 4.7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-19
Original CVE updated
2026-08-31
Advisory published
2026-08-19
Advisory updated
2026-08-31

Who should care

Network administrators and security teams responsible for Wireshark installations, as well as individuals concerned with potential denial of service attacks on network infrastructure, should be aware of this vulnerability and take steps to mitigate it. This includes verifying the integrity of their Wireshark installations, applying patches or updates as recommended by the vendor, and implementing compensating controls such as monitoring and exception tracking.

Technical summary

The UMTS FP protocol dissector in Wireshark versions 4.6.0 to 4.6.7 and 4.4.0 to 4.4.18 is vulnerable to a denial of service attack. This vulnerability is due to a crash in the dissector when processing certain protocol packets. An attacker could potentially exploit this vulnerability by sending specially crafted packets to a vulnerable Wireshark installation, causing the dissector to crash and potentially leading to a denial of service.

Defensive priority

Medium-priority defensive actions recommended due to potential denial of service vulnerability in Wireshark.

Recommended defensive actions

  • Inventory and verify Wireshark installations to identify potentially vulnerable versions.
  • Apply vendor patches or updates to affected Wireshark versions.
  • Implement compensating controls, such as monitoring and exception tracking.
  • Review and update incident response plans to address potential denial of service attacks.

Evidence notes

Evidence from official sources indicates a denial of service vulnerability in Wireshark's UMTS FP protocol dissector, affecting versions 4.6.0 to 4.6.7 and 4.4.0 to 4.4.18. The dissector crashes when processing certain protocol packets, which could be triggered by an attacker sending specially crafted packets. Network administrators and security teams should verify the integrity of their Wireshark installations and apply patches or updates as recommended by the vendor.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-76889 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-76889

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-76889 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-76889

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.