GHSA-m27r-m6rx-mhm4: laravel/reverb (CVE-2026-23524)

Package	Ecosystem	Affected	Fixed in
laravel/reverb	Packagist	<1.7.0	1.7.0

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Laravel Reverb versions prior to 1.7.0 are vulnerable when horizontal scaling is enabled, because data received from Redis PubSub is passed to PHP's unserialize() without restricting which classes can be instantiated. An attacker who can reach the Redis server, which is often deployed without authentication, may be able to achieve remote code execution. Upgrade laravel/reverb to 1.7.0 or later; if that is not possible, require a strong Redis password and restrict Redis to a private network or loopback, or set REVERB_SCALING_ENABLED=false on single-node deployments.

Written 3 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
9.8	Critical	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0098, the 62nd percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:26 UTC First seen by agentprime
31 Oct 2026, 14:26 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.