CVE-2026-9759

Application crash via zero-length ROHC buffer write

Published May 27, 2026 · Updated May 27, 2026

NULL pointer dereference in Wireshark 4.6.0 through 4.6.5 and 4.4.0 through 4.4.15 allows attackers to crash the application. The ROHC dissector allocates a zero-length buffer when an uncompressed-profile packet ends at a large CID field, then tvb_memcpy writes one byte through the resulting NULL pointer. A user must capture injected traffic or open a crafted trace containing a multi-packet GTP-U or PPP sequence that establishes an uncompressed ROHC context with large CIDs; small CIDs are the default.

CVSS severity5.5
Medium
EPSS probability0.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Wireshark 4.6.0 through 4.6.5 and 4.4.0 through 4.4.15 allows attackers to crash the application. The ROHC dissector allocates a zero-length buffer when an uncompressed-profile packet ends at a large CID field, then tvb_memcpy writes one byte through the resulting NULL pointer. A user must capture injected traffic or open a crafted trace containing a multi-packet GTP-U or PPP sequence that establishes an uncompressed ROHC context with large CIDs; small CIDs are the default.

The record

CVE
CVE-2026-9759
Published
May 27, 2026
Updated
May 27, 2026
Vendor
Wireshark Foundation
Product
Wireshark
Classifications
CWE-476
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.4.0 <4.4.16
  2. Affected versionversion=4.6.0 <4.6.6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Wireshark Foundation · Wiresharkversion=4.4.0 <4.4.16; version=4.6.0 <4.6.6

Published CVSS scores

5.5GitLab Inc.CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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