CVE-2026-6429 · cross-distro fix matrix

CVE-2026-6429: It was discovered that curl incorrectly reused non-TLS connections when

Affects 5 Linux releases across 27 (distro × package) combinations. First disclosed: 2026-05-04.

CVSS v3:MEDIUM · 5.3(NVD-published)

Fix per ecosystem

Each block below is a distro release where CVE-2026-6429 has a known fix. Run the listed command on that distro to remediate.

Ubuntu jammy

Source: Ubuntu USN

curl→ fixed in7.81.0-1ubuntu1.24USN-8227-1
```
sudo apt-get install --only-upgrade -y curl
```
libcurl3-gnutls→ fixed in7.81.0-1ubuntu1.24USN-8227-1
```
sudo apt-get install --only-upgrade -y libcurl3-gnutls
```
libcurl3-nss→ fixed in7.81.0-1ubuntu1.24USN-8227-1
```
sudo apt-get install --only-upgrade -y libcurl3-nss
```
libcurl4→ fixed in7.81.0-1ubuntu1.24USN-8227-1
```
sudo apt-get install --only-upgrade -y libcurl4
```
libcurl4-doc→ fixed in7.81.0-1ubuntu1.24USN-8227-1
```
sudo apt-get install --only-upgrade -y libcurl4-doc
```
libcurl4-gnutls-dev→ fixed in7.81.0-1ubuntu1.24USN-8227-1
```
sudo apt-get install --only-upgrade -y libcurl4-gnutls-dev
```
libcurl4-nss-dev→ fixed in7.81.0-1ubuntu1.24USN-8227-1
```
sudo apt-get install --only-upgrade -y libcurl4-nss-dev
```
libcurl4-openssl-dev→ fixed in7.81.0-1ubuntu1.24USN-8227-1
```
sudo apt-get install --only-upgrade -y libcurl4-openssl-dev
```

Ubuntu noble

Source: Ubuntu USN

curl→ fixed in8.5.0-2ubuntu10.9USN-8227-1

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

libcurl3t64-gnutls→ fixed in8.5.0-2ubuntu10.9USN-8227-1

sudo apt-get install --only-upgrade -y libcurl3t64-gnutls

libcurl4-doc→ fixed in8.5.0-2ubuntu10.9USN-8227-1

sudo apt-get install --only-upgrade -y libcurl4-doc

libcurl4-gnutls-dev→ fixed in8.5.0-2ubuntu10.9USN-8227-1

sudo apt-get install --only-upgrade -y libcurl4-gnutls-dev

libcurl4-openssl-dev→ fixed in8.5.0-2ubuntu10.9USN-8227-1

sudo apt-get install --only-upgrade -y libcurl4-openssl-dev

libcurl4t64→ fixed in8.5.0-2ubuntu10.9USN-8227-1

sudo apt-get install --only-upgrade -y libcurl4t64

Ubuntu questing

Source: Ubuntu USN

curl→ fixed in8.14.1-2ubuntu1.3USN-8227-1

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

libcurl3t64-gnutls→ fixed in8.14.1-2ubuntu1.3USN-8227-1

sudo apt-get install --only-upgrade -y libcurl3t64-gnutls

libcurl4-doc→ fixed in8.14.1-2ubuntu1.3USN-8227-1

sudo apt-get install --only-upgrade -y libcurl4-doc

libcurl4-gnutls-dev→ fixed in8.14.1-2ubuntu1.3USN-8227-1

sudo apt-get install --only-upgrade -y libcurl4-gnutls-dev

libcurl4-openssl-dev→ fixed in8.14.1-2ubuntu1.3USN-8227-1

sudo apt-get install --only-upgrade -y libcurl4-openssl-dev

libcurl4t64→ fixed in8.14.1-2ubuntu1.3USN-8227-1

sudo apt-get install --only-upgrade -y libcurl4t64

Ubuntu resolute

Source: Ubuntu USN

curl→ fixed in8.18.0-1ubuntu2.1USN-8227-1

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

libcurl3t64-gnutls→ fixed in8.18.0-1ubuntu2.1USN-8227-1

sudo apt-get install --only-upgrade -y libcurl3t64-gnutls

libcurl4-doc→ fixed in8.18.0-1ubuntu2.1USN-8227-1

sudo apt-get install --only-upgrade -y libcurl4-doc

libcurl4-gnutls-dev→ fixed in8.18.0-1ubuntu2.1USN-8227-1

sudo apt-get install --only-upgrade -y libcurl4-gnutls-dev

libcurl4-openssl-dev→ fixed in8.18.0-1ubuntu2.1USN-8227-1

sudo apt-get install --only-upgrade -y libcurl4-openssl-dev

libcurl4t64→ fixed in8.18.0-1ubuntu2.1USN-8227-1

sudo apt-get install --only-upgrade -y libcurl4t64

Alpine edge

Source: Alpine secdb

curl→ fixed in8.20.0-r0
```
apk update && apk add --upgrade curl
```

Are YOU affected by CVE-2026-6429?

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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