etcd's WAL `ReadAll` method vulnerable to an entry with large index causing panic (CVE-2020-15106)

etcd's WAL `ReadAll` method vulnerable to an entry with large index causing panic (CVE-2020-15106) | HOL Guard CVE

Why this deserves its current priority

CVSS is 5.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps go.etcd.io/etcd (go), go.etcd.io/etcd/v3 (go), go.etcd.io/etcd/v3 (go). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
go.etcd.io/etcdgo	>=0 <0.5.0-alpha.5.0.20200423152442-f4b650b51dc4	0.5.0-alpha.5.0.20200423152442-f4b650b51dc4
go.etcd.io/etcd/v3go	>=0 <3.3.23	3.3.23
go.etcd.io/etcd/v3go	>=3.4.0 <3.4.10	3.4.10

Recommended response

Check inventory. Check lockfiles and deployed manifests for go.etcd.io/etcd, go.etcd.io/etcd/v3, go.etcd.io/etcd/v3.
Review the reported fix. Update go.etcd.io/etcd to 0.5.0-alpha.5.0.20200423152442-f4b650b51dc4; go.etcd.io/etcd/v3 to 3.3.23; go.etcd.io/etcd/v3 to 3.4.10 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Oct 6, 2022
Evidence: source:osv:source_dates:source-dates:record
Source modified
Sep 10, 2026
Evidence: source:osv:source_dates:source-dates:record
First seen by HOL
Sep 10, 2026

Sources and claim methodology

Upstream source description

### Vulnerability type Data Validation ### Detail 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. ### Specific Go Packages Affected github.com/etcd-io/etcd/wal ### References Find out more on this vulnerability in the [security audit report](https://github.com/etcd-io/etcd/blob/master/security/SECURITY_AUDIT.pdf) ### For more information If you have any questions or comments about this advisory: * Contact the [etcd security committee](https://github.com/etcd-io/etcd/blob/master/security/security-release-process.md#product-security-committee-psc)

Quoted source text, attributed separately from HOL analysis.