Use of Uninitialized Variable in Wireshark
Priority LOW 33CWE-457Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 6 fixed, 2 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-457 and the CVSS impact.
Summary
ESS protocol dissector crash in 4.6.0 to 4.6.7 and 4.4.0 to 4.4.18 allows denial of service
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00312 24th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial Wireshark (Wireshark Foundation): 4.6.8, 4.4.18Red Hat: 3 advisoriesRed Hat: 6 fixed, 2 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Wireshark Foundation | Wireshark | 4.6.0 to before 4.6.8; 4.4.0 to before 4.4.18 | 4.6.8, 4.4.18 | Patch available | CNA |
- Wireshark VendorWireshark Foundation Affected 4.6.0 to before 4.6.8; 4.4.0 to before 4.4.18 Fixed in 4.6.8, 4.4.18 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:wireshark:wireshark:*:*:*:*:*:*:*:* | 4.4.0 to before 4.4.18; 4.6.0 to before 4.6.8 | Vulnerable | Wireshark Foundation |
- cpe:2.3:a:wireshark:wireshark:*:*:*:*:*:*:*:* Versions 4.4.0 to before 4.4.18; 4.6.0 to before 4.6.8 Vulnerable ·Wireshark Foundation
Remediation
- Fix · CNA Wireshark (Wireshark Foundation) Fixed in 4.6.8, 4.4.18
Red Hat 3 advisories
- RHSA-2026:84721 Released 2026-10-19 · Red Hat rating Importantwireshark security update
- Red Hat Enterprise Linux AppStream (v. 10) wireshark-1:4.4.2-10.el10_2.8, wireshark-cli-1:4.4.2-10.el10_2.8
- Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) wireshark-devel-1:4.4.2-10.el10_2.8
- RHSA-2026:83657 Released 2026-10-15 · Red Hat rating Moderatewireshark security update
- Red Hat Enterprise Linux AppStream (v. 8) wireshark-1:2.6.2-21.el8_10, wireshark-cli-1:2.6.2-21.el8_10
- Red Hat Enterprise Linux CRB (v. 8) wireshark-devel-1:2.6.2-21.el8_10
- RHSA-2026:83546 Released 2026-10-15 · Red Hat rating Importantwireshark security update
- Red Hat Enterprise Linux AppStream (v. 9) wireshark-1:3.4.10-9.el9_8.5, wireshark-cli-1:3.4.10-9.el9_8.5
- Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) wireshark-devel-1:3.4.10-9.el9_8.5
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
Wireshark 4.4.18, 4.6.8
25 records Highest priority Priority HIGH 2 HIGH, 4 MEDIUM, 19 LOW
Other records, highest priority first
- TI-2026-53718 Heap-based Buffer Overflow in WiresharkPriority HIGH 76
- TI-2026-53720 Heap-based Buffer Overflow in WiresharkPriority HIGH 66
- TI-2026-53716 Buffer Over-read in WiresharkPriority MEDIUM 62
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix yet |
| Red Hat Enterprise Linux AppStream (v. 10) | Fixed | RHSA-2026:84721 |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2026:83657 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2026:83546 |
| Red Hat Enterprise Linux CRB (v. 8) | Fixed | RHSA-2026:83657 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) | Fixed | RHSA-2026:84721 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) | Fixed | RHSA-2026:83546 |
Timeline
- 2026-10-02 Threatist record created from CVE-2026-76919
- 2026-10-03 Alias added: GHSA-q6rp-8q4h-v3mc
- 2026-10-16 Fix available: RHSA-2026:83546 · Red Hat
- 2026-10-16 Fix available: RHSA-2026:83657 · Red Hat
- 2026-10-16 Fix available: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CRB (v. 8) +1 · Red Hat
- 2026-10-19 Fix available: RHSA-2026:84721 · Red Hat
- 2026-10-20 Fix available: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · Red Hat
References
More Wireshark Foundation Wireshark vulnerabilities
- TI-2026-53718 Heap-based Buffer Overflow in Wireshark CVSS 3.1CRITICAL 9.8
- TI-2026-63612 Heap-based Buffer Overflow in Wireshark CVSS 3.1HIGH 8.8
- TI-2024-16149 A buffer overflow in Wireshark before 4.2.0 allows a remote attacker to cause a denial of… CVSS 3.1HIGH 7.5
- TI-2010-00291 Multiple buffer overflows in the LWRES dissector in Wireshark 0.9.15 through 1.0.10 and… CVSS 2.0HIGH 7.5
- TI-2026-63614 Heap-based Buffer Overflow in Wireshark CVSS 3.1HIGH 8.1
- TI-2014-01823 Buffer overflow in the mpeg_read function in wiretap/mpeg.c in the MPEG parser in… CVSS 2.0HIGH 9.3
Sources
- CVE-2026-76919 · CVE Program
- CVE-2026-76919 · NVD
- FIRST EPSS
- GHSA-q6rp-8q4h-v3mc · GitHub Advisory Database · CC BY 4.0
- CVE-2026-76919 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences