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CVE-2026-39821 · cross-distro fix matrix

CVE-2026-39821: It was discovered that Go Networking incorrectly handled certain

Affects 2 Linux releases across 4 (distro × package) combinations. First disclosed: 2026-05-22.

CVSS v3:CRITICAL · 9.6(NVD-published)

Fix per ecosystem

Each block below is a distro release where CVE-2026-39821 has a known fix. Run the listed command on that distro to remediate.

Ubuntu bionic

Source: Ubuntu USN

  • golang-golang-x-net-dev→ fixed in1:0.0+git20170629.c81e7f2+dfsg-2ubuntu0.1~esm3USN-8416-1
    sudo apt-get install --only-upgrade -y golang-golang-x-net-dev
  • golang-go.net-dev→ fixed in1:0.0+git20170629.c81e7f2+dfsg-2ubuntu0.1~esm3USN-8416-1
    sudo apt-get install --only-upgrade -y golang-go.net-dev

Ubuntu focal

Source: Ubuntu USN

  • golang-golang-x-net-dev→ fixed in1:0.0+git20190811.74dc4d7+dfsg-1ubuntu0.1~esm3USN-8416-1
    sudo apt-get install --only-upgrade -y golang-golang-x-net-dev
  • golang-go.net-dev→ fixed in1:0.0+git20190811.74dc4d7+dfsg-1ubuntu0.1~esm3USN-8416-1
    sudo apt-get install --only-upgrade -y golang-go.net-dev
Are YOU affected by CVE-2026-39821?

5-second check on your actual server. Reads /etc/os-release, uname -r, and the distro's package manager; matches against this same cross-source index live.

curl https://mindsparkstack.com/scan.sh | bash
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