CVE-2026-6521
published 2026-04-30CVE-2026-6521: OpenFlow v5 protocol dissector infinite loops in Wireshark 4.6.0 to 4.6.4 and 4.4.0 to 4.4.14 allows denial of service
PriorityP419medium5.5CVSS 3.1
AVLACLPRNUIRSUCNINAH
EPSS
0.14%
4.0th percentile
OpenFlow v5 protocol dissector infinite loops in Wireshark 4.6.0 to 4.6.4 and 4.4.0 to 4.4.14 allows denial of service
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| gitlab | wireshark | — | — |
| wireshark | wireshark | — | — |
| wireshark | wireshark | 4.4.0 – 4.4.14 | — |
| wireshark | wireshark | 4.6.0 – 4.6.4 | — |
| wireshark_foundation | wireshark | >= 4.4.0 < 4.4.15 | 4.4.15 |
| wireshark_foundation | wireshark | >= 4.6.0 < 4.6.5 | 4.6.5 |
CVSS provenance
nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
vendor_redhat5.5MEDIUM
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GHSA
GHSA-9m6f-gr3v-5w4w: OpenFlow v5 protocol dissector infinite loops in Wireshark 4
ghsa_unreviewed·2026-04-30
CVE-2026-6521 [MEDIUM] CWE-835 GHSA-9m6f-gr3v-5w4w: OpenFlow v5 protocol dissector infinite loops in Wireshark 4
OpenFlow v5 protocol dissector infinite loops in Wireshark 4.6.0 to 4.6.4 and 4.4.0 to 4.4.14 allows denial of service
GitLab
Loop with Unreachable Exit Condition ('Infinite Loop') in Wireshark
vendor_gitlab·2026-04-30·CVSS 5.5
CVE-2026-6521 [MEDIUM] CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop') in Wireshark
Loop with Unreachable Exit Condition ('Infinite Loop') in Wireshark
OpenFlow v5 protocol dissector infinite loops in Wireshark 4.6.0 to 4.6.4 and 4.4.0 to 4.4.14 allows denial of service
Affected products: Wireshark
Affected versions: >=4.6.0, =4.4.0, <4.4.15 (affected)
Solution: Upgrade to version 4.6.5 or above
Credit: Sharon Brizinov
Red Hat
Wireshark: Wireshark: Denial of Service via OpenFlow v5 protocol dissector infinite loop
vendor_redhat·2026-04-30·CVSS 5.5
CVE-2026-6521 [MEDIUM] CWE-835 Wireshark: Wireshark: Denial of Service via OpenFlow v5 protocol dissector infinite loop
Wireshark: Wireshark: Denial of Service via OpenFlow v5 protocol dissector infinite loop
A flaw was found in Wireshark. The OpenFlow v5 protocol dissector contains an infinite loop vulnerability. A remote attacker could exploit this by sending a specially crafted packet, leading to a denial of service (DoS) condition, making the application unresponsive.
Mitigation: To reduce exposure, avoid analyzing untrusted network traffic or opening untrusted capture files with Wireshark. The OpenFlow v5 dissector can be disabled in Wireshark's protocol preferences to prevent the vulnerability from being triggered. This action may limit the ability to analyze OpenFlow v5 protocol traffic.
Package: wireshark (Red Hat Enterprise Linux 10) - Fix deferred
Package: wireshark (Red Hat Enterprise Linux 6
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-43399 kernel: drm/amdgpu/userq: Fix reference leak in amdgpu_userq_wait_ioctl
bugzilla·2026-05-08
CVE-2026-43399 CVE-2026-43399 kernel: drm/amdgpu/userq: Fix reference leak in amdgpu_userq_wait_ioctl
CVE-2026-43399 kernel: drm/amdgpu/userq: Fix reference leak in amdgpu_userq_wait_ioctl
In the Linux kernel, the following vulnerability has been resolved:
drm/amdgpu/userq: Fix reference leak in amdgpu_userq_wait_ioctl
Drop reference to syncobj and timeline fence when aborting the ioctl due
output array being too small.
(cherry picked from commit 68951e9c3e6bb22396bc42ef2359751c8315dd27)
Discussion:
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050839-CVE-2026-43399-6521@gregkh/T
Bugzilla
CVE-2026-6521 wireshark: Wireshark: Denial of Service via OpenFlow v5 protocol dissector infinite loop [fedora-all]
bugzilla·2026-05-04·CVSS 5.5
CVE-2026-6521 [MEDIUM] CVE-2026-6521 wireshark: Wireshark: Denial of Service via OpenFlow v5 protocol dissector infinite loop [fedora-all]
CVE-2026-6521 wireshark: Wireshark: Denial of Service via OpenFlow v5 protocol dissector infinite loop [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Bugzilla
CVE-2026-6521 Wireshark: Wireshark: Denial of Service via OpenFlow v5 protocol dissector infinite loop
bugzilla·2026-04-30·CVSS 5.5
CVE-2026-6521 [MEDIUM] CVE-2026-6521 Wireshark: Wireshark: Denial of Service via OpenFlow v5 protocol dissector infinite loop
CVE-2026-6521 Wireshark: Wireshark: Denial of Service via OpenFlow v5 protocol dissector infinite loop
OpenFlow v5 protocol dissector infinite loops in Wireshark 4.6.0 to 4.6.4 and 4.4.0 to 4.4.14 allows denial of service
2026-04-30
Published