PHP package security

Is lcobucci/jwt vulnerable?

Q: Does lcobucci/jwt have known vulnerabilities?

Yes. Packagist lists 1 security advisory for lcobucci/jwt (1 medium severity). The most recent, reported 2021-09-28, is "CVE-2021-41106: File reference keys leads to incorrect hashes on HMAC algorithms". The newest release, 5.6.1, is outside every affected range.

Q: Which version of lcobucci/jwt should I run?

The newest stable release is 5.6.1 (published 2026-10-10). The most recent advisory is fixed in 3.4.6, 4.0.4 and 4.1.5, so stay on or above the fixed version for your major version. Run composer update lcobucci/jwt, then composer audit to confirm nothing else is flagged.

Q: How do I check if my lcobucci/jwt version is affected?

Run composer show lcobucci/jwt in your project to see the installed version, then enter it in the version check on this page. You can also run composer audit, which reads the same Packagist advisory data for every package in your composer.lock.

1 known security advisory for lcobucci/jwt. The latest was reported on 2021-09-28 and is fixed in 3.4.6, 4.0.4 and 4.1.5. The newest release, 5.6.1, is not affected by any of them.

1 medium

Known advisories: 1
Newest release: 5.6.1
Released: 2026-10-10
Affecting newest release: 0
Last synced: 2026-11-03

A simple library to work with JSON Web Token and JSON Web Signature · packagist.org/packages/lcobucci/jwt

Check your version

Run composer show lcobucci/jwt in your project to see the installed version, then enter it here.

Security advisories for lcobucci/jwt

Newest first. “Affected” is the Composer version constraint from the advisory; “fixed in” is each version the advisory names as the first safe one on its release line.

Reported	Advisory	Severity	Affected	Fixed in
2021-09-28	CVE-2021-41106: File reference keys leads to incorrect hashes on HMAC algorithms CVE-2021-41106 · GitHub, FriendsOfPHP/security-advisories	medium	>=3.4.0,<3.4.6 \| >=4.0.0,<4.0.4 \| >=4.1.0,<4.1.5	3.4.6, 4.0.4, 4.1.5

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Questions about lcobucci/jwt

Does lcobucci/jwt have known vulnerabilities?

Yes. Packagist lists 1 security advisory for lcobucci/jwt (1 medium severity). The most recent, reported 2021-09-28, is "CVE-2021-41106: File reference keys leads to incorrect hashes on HMAC algorithms". The newest release, 5.6.1, is outside every affected range.

Which version of lcobucci/jwt should I run?

The newest stable release is 5.6.1 (published 2026-10-10). The most recent advisory is fixed in 3.4.6, 4.0.4 and 4.1.5, so stay on or above the fixed version for your major version. Run composer update lcobucci/jwt, then composer audit to confirm nothing else is flagged.

How do I check if my lcobucci/jwt version is affected?

Run composer show lcobucci/jwt in your project to see the installed version, then enter it in the version check on this page. You can also run composer audit, which reads the same Packagist advisory data for every package in your composer.lock.

Where this data comes from

Advisories come from the Packagist security advisories API, which collects the GitHub Advisory Database and the FriendsOfPHP security advisories. composer audit reads the same data. Releases come from packagist.org. Last synced 2026-11-03; we re-check daily. Each advisory links to its source. Spot an error? Tell us.

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