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Wireshark CVE-2026-15165

| EUVDEUVD-2026-42412 MEDIUM
Heap-based Buffer Overflow (CWE-122)
2026-07-08 cve@gitlab.com GHSA-3q2h-7599-7r76
Buffer Overflow Denial Of Service Heap Overflow Red Hat Wireshark Suse
5.5
CVSS 3.1 · NVD
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Severity by source

Vendor (gitlab) PRIMARY
MEDIUM
qualitative
NVD
5.5 MEDIUM
AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
vuln.today AI
7.5 HIGH

Malformed ECH packet is processed without auth or interaction and only crashes the dissector, so AV:N/AC:L/PR:N/UI:N with availability-only A:H and C/I:N.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
MEDIUM
qualitative
Red Hat
6.5 MEDIUM
qualitative

Primary rating from Vendor (gitlab).

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

9
Severity Changed
Jul 10, 2026 - 13:52 NVD
HIGH MEDIUM
CVSS changed
Jul 10, 2026 - 13:52 NVD
7.5 (HIGH) 5.5 (MEDIUM)
Analysis Updated
Jul 09, 2026 - 20:15 vuln.today
v3 (cvss_changed)
Analysis Updated
Jul 09, 2026 - 20:15 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Jul 09, 2026 - 20:07 vuln.today
cvss_changed
Severity Changed
Jul 09, 2026 - 20:07 NVD
MEDIUM HIGH
CVSS changed
Jul 09, 2026 - 20:07 NVD
5.5 (MEDIUM) 7.5 (HIGH)
Analysis Generated
Jul 08, 2026 - 22:11 vuln.today
Patch available
Jul 08, 2026 - 22:04 EUVD

DescriptionNVD

TLS ECH decryptor crash in Wireshark 4.6.0 to 4.6.6 allows denial of service

AnalysisAI

Denial of service in Wireshark 4.6.0 through 4.6.6 lets a remote attacker crash the application by feeding it a malformed TLS packet using the Encrypted Client Hello (ECH) extension, triggering a heap buffer overflow in the ECH decryptor. No authentication or user interaction beyond processing the traffic is required, though impact is limited to availability (analyzer crash) with no code execution or data disclosure claimed. Publicly available exploit code exists per SSVC (POC), EPSS is low at 0.14% (4th percentile), and it is not listed in CISA KEV.

Technical ContextAI

Wireshark is a widely used network protocol analyzer that dissects captured traffic across hundreds of protocols. The flaw lives in its TLS dissector, specifically the code path that decrypts and parses the Encrypted Client Hello (ECH) extension - a TLS 1.3 privacy feature that encrypts the ClientHello inner content. The root cause is classified as CWE-122 (heap-based buffer overflow), consistent with the vendor tags 'Heap Overflow' and 'Buffer Overflow', meaning the ECH decryptor writes past the bounds of a heap-allocated buffer when handling crafted input. The single affected CPE is cpe:2.3:a:wireshark:wireshark, confirming this is the core Wireshark application (dissector engine) rather than a plugin.

RemediationAI

Vendor-released patch: upgrade to Wireshark 4.6.7 or later, which resolves the ECH decryptor heap overflow per advisory wnpa-sec-2026-56 (https://www.wireshark.org/security/wnpa-sec-2026-56.html). Until upgrading, reduce exposure by avoiding opening untrusted capture files and by not running live captures on untrusted segments with the affected 4.6.x build; if analysis of suspect traffic is required, use a patched build or a disposable/isolated host. As a targeted workaround you can disable the TLS dissector (Analyze → Enabled Protocols → uncheck TLS) so the vulnerable ECH parsing path is not invoked - the side effect is loss of all TLS decoding during that session. Because Wireshark is often run with elevated capture privileges, running it as an unprivileged user further limits blast radius.

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Buffer overflow in the mpeg_read function in wiretap/mpeg.c in the MPEG parser in Wireshark 1.8.x before 1.8.13 and 1.10
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5.0 Jun 09

The dissect_capwap_data function in epan/dissectors/packet-capwap.c in the CAPWAP dissector in Wireshark 1.6.x before 1.
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The netmonrec_comment_destroy function in wiretap/netmon.c in Wireshark through 2.4.4 performs a free operation on an un
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wiretap/libpcap.c in the libpcap file parser in Wireshark 1.10.x before 1.10.4 allows remote attackers to execute arbitr
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7.5 Jun 02

In Wireshark 2.2.0 to 2.2.6, the IPv6 dissector could crash. Rated high severity (CVSS 7.5), this vulnerability is remot
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CVE-2017-9347 HIGH POC
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In Wireshark 2.2.0 to 2.2.6, the ROS dissector could crash with a NULL pointer dereference. Rated high severity (CVSS 7.
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7.5 Aug 24

BT SDP dissector memory leak in Wireshark 4.0.0 to 4.0.7 and 3.6.0 to 3.6.15 allows denial of service via packet injecti
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CBOR dissector crash in Wireshark 4.0.0 to 4.0.6 allows denial of service via packet injection or crafted capture file.

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7.5 Apr 12

RPCoRDMA dissector crash in Wireshark 4.0.0 to 4.0.4 and 3.6.0 to 3.6.12 allows denial of service via packet injection o

Same weakness CWE-122 – Heap-based Buffer Overflow

View all
CVE-2023-4911 HIGH POC
7.8
CVE-2023-27997 CRITICAL
9.8
CVE-2025-25249 CRITICAL POC
9.8
CVE-2026-85880 HIGH POC
7.8
CVE-2025-24985 HIGH POC
7.8
CVE-2026-53362 HIGH POC
7.8
CVE-2025-21418 HIGH
7.8
CVE-2023-23376 HIGH
7.8

Same technique Buffer Overflow

View all
CVE-2017-7269 CRITICAL POC
9.8
CVE-2015-5119 CRITICAL POC
9.8
CVE-2015-3113 CRITICAL POC
9.8
CVE-2011-2462 CRITICAL POC
9.8
CVE-2020-0796 CRITICAL POC
10.0
CVE-2019-11043 CRITICAL POC
9.8
CVE-2009-0927 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8

Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Module for Basesystem 15 SP7 Affected
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected

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CVE-2026-15165 vulnerability details – vuln.today
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