CVE-2026-58055 · cross-distro fix matrix

CVE-2026-58055: It was discovered that the nghttp2 nghttpx proxy incorrectly handled

Affects 5 Linux releases across 29 (distro × package) combinations. First disclosed: 2026-06-28.

CVSS v3:MEDIUM · 5.4(NVD-published)

Fix per ecosystem

Each block below is a distro release where CVE-2026-58055 has a known fix. Run the listed command on that distro to remediate.

Ubuntu jammy

Source: Ubuntu USN

nghttp2→ fixed in1.43.0-1ubuntu0.4USN-8495-1

sudo apt-get install --only-upgrade -y nghttp2

libnghttp2-14→ fixed in1.43.0-1ubuntu0.4USN-8495-1

sudo apt-get install --only-upgrade -y libnghttp2-14

libnghttp2-dev→ fixed in1.43.0-1ubuntu0.4USN-8495-1

sudo apt-get install --only-upgrade -y libnghttp2-dev

libnghttp2-doc→ fixed in1.43.0-1ubuntu0.4USN-8495-1

sudo apt-get install --only-upgrade -y libnghttp2-doc

nghttp2-client→ fixed in1.43.0-1ubuntu0.4USN-8495-1

sudo apt-get install --only-upgrade -y nghttp2-client

nghttp2-proxy→ fixed in1.43.0-1ubuntu0.4USN-8495-1

sudo apt-get install --only-upgrade -y nghttp2-proxy

nghttp2-server→ fixed in1.43.0-1ubuntu0.4USN-8495-1

sudo apt-get install --only-upgrade -y nghttp2-server

Ubuntu noble

Source: Ubuntu USN

nghttp2→ fixed in1.59.0-1ubuntu0.4USN-8495-1

sudo apt-get install --only-upgrade -y nghttp2

libnghttp2-14→ fixed in1.59.0-1ubuntu0.4USN-8495-1

sudo apt-get install --only-upgrade -y libnghttp2-14

libnghttp2-dev→ fixed in1.59.0-1ubuntu0.4USN-8495-1

sudo apt-get install --only-upgrade -y libnghttp2-dev

libnghttp2-doc→ fixed in1.59.0-1ubuntu0.4USN-8495-1

sudo apt-get install --only-upgrade -y libnghttp2-doc

nghttp2-client→ fixed in1.59.0-1ubuntu0.4USN-8495-1

sudo apt-get install --only-upgrade -y nghttp2-client

nghttp2-proxy→ fixed in1.59.0-1ubuntu0.4USN-8495-1

sudo apt-get install --only-upgrade -y nghttp2-proxy

nghttp2-server→ fixed in1.59.0-1ubuntu0.4USN-8495-1

sudo apt-get install --only-upgrade -y nghttp2-server

Ubuntu questing

Source: Ubuntu USN

nghttp2→ fixed in1.64.0-1.1ubuntu1.2USN-8495-1
```
sudo apt-get install --only-upgrade -y nghttp2
```
libnghttp2-14→ fixed in1.64.0-1.1ubuntu1.2USN-8495-1
```
sudo apt-get install --only-upgrade -y libnghttp2-14
```
libnghttp2-dev→ fixed in1.64.0-1.1ubuntu1.2USN-8495-1
```
sudo apt-get install --only-upgrade -y libnghttp2-dev
```
libnghttp2-doc→ fixed in1.64.0-1.1ubuntu1.2USN-8495-1
```
sudo apt-get install --only-upgrade -y libnghttp2-doc
```
nghttp2-client→ fixed in1.64.0-1.1ubuntu1.2USN-8495-1
```
sudo apt-get install --only-upgrade -y nghttp2-client
```
nghttp2-proxy→ fixed in1.64.0-1.1ubuntu1.2USN-8495-1
```
sudo apt-get install --only-upgrade -y nghttp2-proxy
```
nghttp2-server→ fixed in1.64.0-1.1ubuntu1.2USN-8495-1
```
sudo apt-get install --only-upgrade -y nghttp2-server
```

Ubuntu resolute

Source: Ubuntu USN

nghttp2→ fixed in1.68.0-2ubuntu0.2USN-8495-1

sudo apt-get install --only-upgrade -y nghttp2

libnghttp2-14→ fixed in1.68.0-2ubuntu0.2USN-8495-1

sudo apt-get install --only-upgrade -y libnghttp2-14

libnghttp2-dev→ fixed in1.68.0-2ubuntu0.2USN-8495-1

sudo apt-get install --only-upgrade -y libnghttp2-dev

libnghttp2-doc→ fixed in1.68.0-2ubuntu0.2USN-8495-1

sudo apt-get install --only-upgrade -y libnghttp2-doc

nghttp2-client→ fixed in1.68.0-2ubuntu0.2USN-8495-1

sudo apt-get install --only-upgrade -y nghttp2-client

nghttp2-proxy→ fixed in1.68.0-2ubuntu0.2USN-8495-1

sudo apt-get install --only-upgrade -y nghttp2-proxy

nghttp2-server→ fixed in1.68.0-2ubuntu0.2USN-8495-1

sudo apt-get install --only-upgrade -y nghttp2-server

Alpine edge

Source: Alpine secdb

nghttp2→ fixed in1.70.0-r0
```
apk update && apk add --upgrade nghttp2
```

Are YOU affected by CVE-2026-58055?

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.

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