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Vulnerability · Published Aug 7, 2026 · Assigned by GitHub_M

CVE-2026-65819gopacket: Multiple layer decoders panic on crafted packets (out-of-bounds/underflow) enabling unauthenticated remote DoS via DecodingLayerParser

High 7.5

In plain English

A high-severity out-of-bounds read in gopacket from gopacket. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.4%top 69.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

gopacket provides packet processing capabilities for Go. Through version 1.7.0, multiple layer decoders use attacker-controlled lengths, counts, or offsets before validating them against packet buffers, allowing a crafted packet decoded through DecodingLayerParser or DecodeFromBytes to trigger an unrecovered panic and remotely deny service. A patch commit is available at 210f25f.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12golang-github-gopacket-gopacketno fix listedDEBIAN-CVE-2026-65819
Debian:13golang-github-gopacket-gopacketno fix listedDEBIAN-CVE-2026-65819
Debian:14golang-github-gopacket-gopacketno fix listedDEBIAN-CVE-2026-65819
Debian:12gopacketno fix listedDEBIAN-CVE-2026-65819
Debian:13gopacketno fix listedDEBIAN-CVE-2026-65819
Debian:14gopacketno fix listedDEBIAN-CVE-2026-65819
Ubuntu:24.04:LTSgolang-github-gopacket-gopacketno fix listedUBUNTU-CVE-2026-65819
Ubuntu:26.04:LTSgolang-github-gopacket-gopacketno fix listedUBUNTU-CVE-2026-65819
Ubuntu:26.10golang-github-gopacket-gopacketno fix listedUBUNTU-CVE-2026-65819

Affected products (as reported)

VendorProductVersions
gopacket gopacket <= 1.7.0

Weakness: CWE-125, CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References