Service interrupt via off-by-one heap write
Published Aug 19, 2026 · Updated Aug 20, 2026
Out-of-bounds write in Wireshark 4.6.0 through 4.6.7 and 4.4.0 through 4.4.17 allows attackers to crash the application via crafted 3GPP log data. In wiretap/log3gpp.c, build_packet_record() reserves data_chars / 2 bytes for decoded hex payload but decodes with an inclusive loop bound, so it writes one extra byte past the packet buffer. Exploitation requires Wireshark to ingest malformed 3GPP log content from a capture file or injected traffic, and the published evidence bounds the consequence to a denial-of-service crash rather than code execution.
Summary
What happened
Out-of-bounds write in Wireshark 4.6.0 through 4.6.7 and 4.4.0 through 4.4.17 allows attackers to crash the application via crafted 3GPP log data. In wiretap/log3gpp.c, build_packet_record() reserves data_chars / 2 bytes for decoded hex payload but decodes with an inclusive loop bound, so it writes one extra byte past the packet buffer. Exploitation requires Wireshark to ingest malformed 3GPP log content from a capture file or injected traffic, and the published evidence bounds the consequence to a denial-of-service crash rather than code execution.
The record
- CVE
- CVE-2026-76920
- Published
- Aug 19, 2026
- Updated
- Aug 20, 2026
- Vendor
- Wireshark Foundation
- Product
- Wireshark
- Classifications
- CWE-787
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 19, 2026CVE publishedPublication date reported by the CVE source.
- Aug 20, 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.
- Affected versionversion=4.4.0 <4.4.18
- Affected versionversion=4.6.0 <4.6.8
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
- Aisle Security 3GPP log decoder PoCproof of concept · demonstrated
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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