# CVE-2020-15106: etcd: In etcd before versions 3.3.23 and 3.4.10, a large slice causes panic in decodeRecord method

CVE-2020-15106 is fixed in 4 products on 1 platform, first by etcd 3.2.17+dfsg-1ubuntu0.1~esm1, released August 6, 2020. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2020-15106
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0126
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 5, 2020

## Description

In etcd before versions 3.3.23 and 3.4.10, a large slice causes panic in decodeRecord method. The size of a record is stored in the length field of a WAL file and no additional validation is done on this data. Therefore, it is possible to forge an extremely large frame size that can unintentionally panic at the expense of any RAFT participant trying to decode the WAL.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | etcd Ubuntu 18.04.6 LTS (bionic) | 3.2.17+dfsg-1ubuntu0.1~esm1 | [etcd 3.2.17+dfsg-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-etcd-3.2.17-dfsg-1ubuntu0.1-esm1.md) | Aug 6, 2020 |
| Linux | etcd Ubuntu 20.04 LTS (focal) | 3.2.26+dfsg-6ubuntu0.1 | [etcd 3.2.26+dfsg-6ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-etcd-3.2.26-dfsg-6ubuntu0.1.md) | Aug 6, 2020 |
| Linux | etcd opensuse-leap 15.6 | 3.5.12-bp156.4.3.1 | [OPENSUSE-SU-2025:0003-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-0003-1.md) | Jan 7, 2025 |
| Linux | etcd-client Ubuntu 18.04.6 LTS (bionic) | 3.2.17+dfsg-1ubuntu0.1~esm1 | [etcd-client 3.2.17+dfsg-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-etcd-client-3.2.17-dfsg-1ubuntu0.1-esm1.md) | Aug 6, 2020 |
| Linux | etcd-client Ubuntu 20.04 LTS (focal) | 3.2.26+dfsg-6ubuntu0.1 | [etcd-client 3.2.26+dfsg-6ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-etcd-client-3.2.26-dfsg-6ubuntu0.1.md) | Aug 6, 2020 |
| Linux | etcd-server Ubuntu 18.04.6 LTS (bionic) | 3.2.17+dfsg-1ubuntu0.1~esm1 | [etcd-server 3.2.17+dfsg-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-etcd-server-3.2.17-dfsg-1ubuntu0.1-esm1.md) | Aug 6, 2020 |
| Linux | etcd-server Ubuntu 20.04 LTS (focal) | 3.2.26+dfsg-6ubuntu0.1 | [etcd-server 3.2.26+dfsg-6ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-etcd-server-3.2.26-dfsg-6ubuntu0.1.md) | Aug 6, 2020 |
| Linux | golang-etcd-server-dev Ubuntu 18.04.6 LTS (bionic) | 3.2.17+dfsg-1ubuntu0.1~esm1 | [golang-etcd-server-dev 3.2.17+dfsg-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-golang-etcd-server-dev-3.2.17-dfsg-1ubuntu0.1-esm1.md) | Aug 6, 2020 |
| Linux | golang-etcd-server-dev Ubuntu 20.04 LTS (focal) | 3.2.26+dfsg-6ubuntu0.1 | [golang-etcd-server-dev 3.2.26+dfsg-6ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-golang-etcd-server-dev-3.2.26-dfsg-6ubuntu0.1.md) | Aug 6, 2020 |

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Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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