CVE-2020-28196 · cross-distro fix matrix

CVE-2020-28196: MIT Kerberos 5 (aka krb5) before 1.17.2 and 1.18.x before 1.18.3 allows unbounded recursion via an ASN.1-encoded Kerberos message because the lib/krb5/asn.1/asn1_encode.c support for BER indefinite lengths lacks a recursion limit.

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

Fix per ecosystem

Each block below is a distro release where CVE-2020-28196 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

krb5→ fixed in1.18.3-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y krb5
```

Debian bookworm

Source: Debian Security Tracker

krb5→ fixed in1.18.3-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y krb5
```

Debian trixie

Source: Debian Security Tracker

krb5→ fixed in1.18.3-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y krb5
```

Alpine v3.20

Source: Alpine secdb

krb5→ fixed in1.18.3-r0
```
apk update && apk add --upgrade krb5
```

Alpine v3.21

Source: Alpine secdb

krb5→ fixed in1.18.3-r0
```
apk update && apk add --upgrade krb5
```

Alpine edge

Source: Alpine secdb

krb5→ fixed in1.18.3-r0
```
apk update && apk add --upgrade krb5
```

Alpine v3.18

Source: Alpine secdb

krb5→ fixed in1.18.3-r0
```
apk update && apk add --upgrade krb5
```

Alpine v3.19

Source: Alpine secdb

krb5→ fixed in1.18.3-r0
```
apk update && apk add --upgrade krb5
```

Are YOU affected by CVE-2020-28196?

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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