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Fencer Intel
medium 5.5

CVE-2026-96421 json

Improperly Controlled Sequential Memory Allocation in Wireshark

published last mo. modified last mo. also EUVD-2026-88709

cvss
5.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 3%
public exploits
0
none known

Summary

USB HID protocol dissector infinite loop and memory leak in 4.6.0 to 4.6.8 and 4.4.0 to 4.4.18 allows denial of service

Patch / fix

  • Wireshark Foundation Wireshark 4.4.19, 4.6.9
  • wireshark Debian 13 4.4.19-0+deb13u1
  • wireshark Debian 14 4.6.9-1

debian advisories DEBIAN-CVE-2026-96421

  • wireshark openSUSE Tumbleweed 4.6.9-1.1

opensuse advisories openSUSE-SU-2026:11912-1

Is CVE-2026-96421 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-96421 updated cvss 5.5

wireshark: Wireshark: Denial of Service via USB HID dissector infinite loop

  • Red Hat Enterprise Linux 10 wireshark 4.4.2-10.el10_2
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Enterprise Linux 6 wireshark, wireshark-gnome, wireshark 4.4.2-10.el10_2 Red Hat Enterprise Linux 7 wireshark, wireshark-gnome, wireshark 4.4.2-10.el10_2 Red Hat Enterprise Linux 8 wireshark, wireshark-cli, wireshark 4.4.2-10.el10_2 Red Hat Enterprise Linux 9 wireshark, wireshark-cli, wireshark 4.4.2-10.el10_2
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
last mo.

Exploit prediction

0.14% chance of exploitation in the next 30 days, higher than 3% of all scored CVEs (FIRST EPSS, 2026-11-11).

Exploits and checks

  • gitlab.com https://gitlab.com/wireshark/wireshark/-/work_items/21566 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected products

  • Wireshark Foundation Wireshark

Classification

Weakness
  • CWE-1325 Improperly Controlled Sequential Memory Allocation

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.