CVE-2023-50868 · cross-distro fix matrix

CVE-2023-50868: The Closest Encloser Proof aspect of the DNS protocol (in RFC 5155 when RFC 9276 guidance is skipped) allows remote attackers to cause a denial of service (CPU consumption for SHA-1 computations) via DNSSEC responses in a random subdomain attack, aka the "NSEC3" issue. The RFC 5155 specification imp

Affects 8 Linux releases across 42 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2023-50868 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

bind9→ fixed in1:9.16.48-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y bind9
```
dnsmasq→ fixed in2.85-1+deb11u1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y dnsmasq
```
systemd→ fixed in247.3-7+deb11u6urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y systemd
```
unbound→ fixed in1.13.1-1+deb11u2urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y unbound
```

Debian bookworm

Source: Debian Security Tracker

bind9→ fixed in1:9.18.24-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y bind9
```
dnsmasq→ fixed in2.90-4~deb12u1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y dnsmasq
```
knot-resolver→ fixed in5.6.0-1+deb12u1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y knot-resolver
```
pdns-recursor→ fixed in4.8.6-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y pdns-recursor
```
systemd→ fixed in252.23-1~deb12u1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y systemd
```
unbound→ fixed in1.17.1-2+deb12u2urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y unbound
```

Debian trixie

Source: Debian Security Tracker

bind9→ fixed in1:9.19.21-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y bind9
```
dnsjava→ fixed in3.6.2-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y dnsjava
```
dnsmasq→ fixed in2.90-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y dnsmasq
```
knot-resolver→ fixed in5.7.1-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y knot-resolver
```
pdns-recursor→ fixed in4.9.3-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y pdns-recursor
```
systemd→ fixed in255.4-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y systemd
```
unbound→ fixed in1.19.1-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y unbound
```

Alpine v3.20

Source: Alpine secdb

bind→ fixed in9.18.24-r0
```
apk update && apk add --upgrade bind
```
dnsmasq→ fixed in2.90-r0
```
apk update && apk add --upgrade dnsmasq
```
unbound→ fixed in1.19.1-r0
```
apk update && apk add --upgrade unbound
```

knot-resolver→ fixed in5.7.1-r0

apk update && apk add --upgrade knot-resolver

pdns-recursor→ fixed in5.0.2-r0

apk update && apk add --upgrade pdns-recursor

Alpine v3.21

Source: Alpine secdb

bind→ fixed in9.18.24-r0
```
apk update && apk add --upgrade bind
```
dnsmasq→ fixed in2.90-r0
```
apk update && apk add --upgrade dnsmasq
```
unbound→ fixed in1.19.1-r0
```
apk update && apk add --upgrade unbound
```

knot-resolver→ fixed in5.7.1-r0

apk update && apk add --upgrade knot-resolver

pdns-recursor→ fixed in5.0.2-r0

apk update && apk add --upgrade pdns-recursor

Alpine edge

Source: Alpine secdb

bind→ fixed in9.18.24-r0
```
apk update && apk add --upgrade bind
```
dnsmasq→ fixed in2.90-r0
```
apk update && apk add --upgrade dnsmasq
```
unbound→ fixed in1.19.1-r0
```
apk update && apk add --upgrade unbound
```

knot-resolver→ fixed in5.7.1-r0

apk update && apk add --upgrade knot-resolver

pdns-recursor→ fixed in5.0.2-r0

apk update && apk add --upgrade pdns-recursor

Alpine v3.18

Source: Alpine secdb

bind→ fixed in9.18.24-r0
```
apk update && apk add --upgrade bind
```
dnsmasq→ fixed in2.90-r0
```
apk update && apk add --upgrade dnsmasq
```
unbound→ fixed in1.19.1-r0
```
apk update && apk add --upgrade unbound
```

knot-resolver→ fixed in5.7.1-r0

apk update && apk add --upgrade knot-resolver

pdns-recursor→ fixed in4.9.3-r0

apk update && apk add --upgrade pdns-recursor

Alpine v3.19

Source: Alpine secdb

bind→ fixed in9.18.24-r0
```
apk update && apk add --upgrade bind
```
dnsmasq→ fixed in2.90-r0
```
apk update && apk add --upgrade dnsmasq
```
unbound→ fixed in1.19.1-r0
```
apk update && apk add --upgrade unbound
```

knot-resolver→ fixed in5.7.1-r0

apk update && apk add --upgrade knot-resolver

pdns-recursor→ fixed in4.9.3-r0

apk update && apk add --upgrade pdns-recursor

Are YOU affected by CVE-2023-50868?

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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Continuous monitoring beats manual checking

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