Read the docs
TI-2026-53718 Aliases CVE-2026-76886GHSA-wrhv-64xq-9g54

Heap-based Buffer Overflow in Wireshark

Priority HIGH 76CWE-122Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · 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-122 and the CVSS impact.

Summary

C12.22 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 Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00382 32nd percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged 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
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Wireshark FoundationWireshark4.6.0 to before 4.6.8; 4.4.0 to before 4.4.184.6.8, 4.4.18Patch availableCNA
  • 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

CPEVersionsRoleVendor
cpe:2.3:a:wireshark:wireshark:*:*:*:*:*:*:*:*4.4.0 to before 4.4.18; 4.6.0 to before 4.6.8VulnerableWireshark 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 Important
    wireshark 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 Moderate
    wireshark 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 Important
    wireshark 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-2026-53720 Heap-based Buffer Overflow in WiresharkPriority HIGH 66
    • TI-2026-53716 Buffer Over-read in WiresharkPriority MEDIUM 62
    • TI-2026-53715 Heap-based Buffer Overflow in WiresharkPriority MEDIUM 58
    Show all 25 records →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo 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

  1. 2026-10-02 Threatist record created from CVE-2026-76886
  2. 2026-10-03 Alias added: GHSA-wrhv-64xq-9g54
  3. 2026-10-16 Fix available: RHSA-2026:83546 · Red Hat
  4. 2026-10-16 Fix available: RHSA-2026:83657 · Red Hat
  5. 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
  6. 2026-10-19 Fix available: RHSA-2026:84721 · Red Hat
  7. 2026-10-20 Fix available: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · Red Hat

References

Exploit 2

Advisory 1

  • 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
  • TI-2024-10743 Buffer Over-read in Wireshark CVSS 3.1HIGH 7.8
See all 794 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences