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CVE-2026-6535· NVD / CVE Program· CNA GitLab

Improperly Controlled Sequential Memory Allocation in Wireshark

Dissection engine zlib decompression crash in Wireshark 4.6.0 to 4.6.4 and 4.4.0 to 4.4.14 allows denial of service

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Apr 30, 2026
Updated
Jun 17, 2026
EPSS
0.2% · 4th percentile
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Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · GitLab
5.5
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
wiresharkwireshark

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • wireshark wireshark4.4.0 and later · up to 4.4.14 inclusive
  • wireshark wireshark4.6.0 and later · up to 4.6.4 inclusive

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitLab). Independent of NVD's CPE analysis and usually ahead of it.

  • Wireshark Foundation Wireshark

    • 4.6.0 and later · before 4.6.5affected · semver
    • 4.4.0 and later · before 4.4.15affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12wiresharkall versions—
Debian:13wiresharkbefore 4.4.15-0+deb13u14.4.15-0+deb13u1
Debian:14wiresharkbefore 4.6.5-14.6.5-1
SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5wiresharkbefore 2.4.16-48.69.12.4.16-48.69.1

Same product

wireshark: all records

Other highest-scoring records for the same primary product.

  • CVE-2010-0304Multiple buffer overflows in the LWRES dissector in Wireshark 0.9.15 through 1.0.10 and 1.2.0 through 1.2.5 allow remote attackers to cause
    52Plan
  • CVE-2014-2299Buffer 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.x before 1.10.6 all
    51Plan
  • CVE-2011-1591Stack-based buffer overflow in the DECT dissector in epan/dissectors/packet-dect.c in Wireshark 1.4.x before 1.4.5 allows remote attackers t
    50Plan
  • CVE-2011-3360Untrusted search path vulnerability in Wireshark 1.4.x before 1.4.9 and 1.6.x before 1.6.2 allows local users to gain privileges via a Troja
    47Plan
  • CVE-2010-4538Buffer overflow in the sect_enttec_dmx_da function in epan/dissectors/packet-enttec.c in Wireshark 1.4.2 allows remote attackers to cause a
    46Plan
  • CVE-2009-1210Format string vulnerability in the PROFINET/DCP (PN-DCP) dissector in Wireshark 1.0.6 and earlier allows remote attackers to execute arbitra
    45Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Wireshark Foundation Wireshark4.4.15Vendor (CNA)
Wireshark Foundation Wireshark4.6.5Vendor (CNA)
debian:wireshark4.4.15-0+deb13u1 · Debian:13Package registry (OSV)
suse:wireshark2.4.16-48.69.1 · SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-320164 days apartImproperly Controlled Sequential Memory Allocation in Wireshark
    30Monitor
  • CVE-2026-65330 days apartImproperly Controlled Sequential Memory Allocation in Wireshark
    22Monitor
  • CVE-2026-68670 days apartImproperly Controlled Sequential Memory Allocation in Wireshark
    22Monitor
  • CVE-2026-68690 days apartImproperly Controlled Sequential Memory Allocation in Wireshark
    22Monitor
  • CVE-2025-13945148 days apartImproperly Controlled Sequential Memory Allocation in Wireshark
    22Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-1325 · Improperly Controlled Sequential Memory Allocation

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records