CVE-2026-42764 · cross-distro fix matrix

CVE-2026-42764: Frank Buss discovered that OpenSSL had a heap buffer over-read in ASN.1

Affects 5 Linux releases across 19 (distro × package) combinations. First disclosed: 2026-06-09.

Fix per ecosystem

Each block below is a distro release where CVE-2026-42764 has a known fix. Run the listed command on that distro to remediate.

Ubuntu jammy

Source: Ubuntu USN

openssl→ fixed in3.0.2-0ubuntu1.25USN-8414-1

sudo apt-get install --only-upgrade -y openssl

libssl-dev→ fixed in3.0.2-0ubuntu1.25USN-8414-1

sudo apt-get install --only-upgrade -y libssl-dev

libssl-doc→ fixed in3.0.2-0ubuntu1.25USN-8414-1

sudo apt-get install --only-upgrade -y libssl-doc

libssl3→ fixed in3.0.2-0ubuntu1.25USN-8414-1

sudo apt-get install --only-upgrade -y libssl3

Ubuntu noble

Source: Ubuntu USN

openssl→ fixed in3.0.13-0ubuntu3.11USN-8414-1
```
sudo apt-get install --only-upgrade -y openssl
```
libssl-dev→ fixed in3.0.13-0ubuntu3.11USN-8414-1
```
sudo apt-get install --only-upgrade -y libssl-dev
```
libssl-doc→ fixed in3.0.13-0ubuntu3.11USN-8414-1
```
sudo apt-get install --only-upgrade -y libssl-doc
```
libssl3t64→ fixed in3.0.13-0ubuntu3.11USN-8414-1
```
sudo apt-get install --only-upgrade -y libssl3t64
```

Ubuntu questing

Source: Ubuntu USN

openssl→ fixed in3.5.3-1ubuntu3.4USN-8414-1

sudo apt-get install --only-upgrade -y openssl

libssl-dev→ fixed in3.5.3-1ubuntu3.4USN-8414-1

sudo apt-get install --only-upgrade -y libssl-dev

libssl-doc→ fixed in3.5.3-1ubuntu3.4USN-8414-1

sudo apt-get install --only-upgrade -y libssl-doc

libssl3t64→ fixed in3.5.3-1ubuntu3.4USN-8414-1

sudo apt-get install --only-upgrade -y libssl3t64

openssl-provider-legacy→ fixed in3.5.3-1ubuntu3.4USN-8414-1

sudo apt-get install --only-upgrade -y openssl-provider-legacy

Ubuntu resolute

Source: Ubuntu USN

openssl→ fixed in3.5.5-1ubuntu3.2USN-8414-1

sudo apt-get install --only-upgrade -y openssl

libssl-dev→ fixed in3.5.5-1ubuntu3.2USN-8414-1

sudo apt-get install --only-upgrade -y libssl-dev

libssl-doc→ fixed in3.5.5-1ubuntu3.2USN-8414-1

sudo apt-get install --only-upgrade -y libssl-doc

libssl3t64→ fixed in3.5.5-1ubuntu3.2USN-8414-1

sudo apt-get install --only-upgrade -y libssl3t64

openssl-provider-legacy→ fixed in3.5.5-1ubuntu3.2USN-8414-1

sudo apt-get install --only-upgrade -y openssl-provider-legacy

Debian trixie

Source: Debian Security Tracker

openssl→ fixed in3.5.6-1~deb13u2urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y openssl
```

Are YOU affected by CVE-2026-42764?

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

Form-based quickscan View on NVD

Continuous monitoring beats manual checking

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