CVE-2026-84372 Predis: Redis command injection and denial of service via CRLF smuggling in pipelined commands on aggregate connections
Attackers can inject Redis commands or cause denial of service via CRLF smuggling in pipelined operations on aggregate connections.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-84372?
CVE-2026-84372 is a critical command injection vulnerability in predis, published on 1 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Predis is a flexible and feature-complete Redis and Valkey client for PHP. From version 3.0.0-RC1 until version 3.3.0, pipeline handling on aggregate cluster and replication connections reparses an already serialized RESP buffer in AbstractAggregateConnection::write() by splitting it with explode("\r\n") instead of honoring RESP length prefixes. Attacker-controlled keys or values containing CRLF sequences can therefore be interpreted by Command::deserializeCommand() as additional commands. On cluster connections, ClusterStrategy::getFakeKey() can route injected keyless commands using the literal fake key value "key", permitting operations such as shard-wide cache deletion, targeted data modification, data reads, or node disruption. On replication connections, malformed reparsing can throw an uncaught exception and repeatedly terminate affected requests. Only pipeline() reaches this vulnerable path; transaction() and MULTI are not affected. This issue is fixed in version 3.3.0.
Weakness: CWE-93
Which versions are affected by CVE-2026-84372?
2 open source packages ship an affected version, including predis/predis.
| Package | Affected | Fixed in |
|---|---|---|
predis/predis Packagist | From 3.0.0-RC1 | 3.3.0 |
predis/predis Packagist | From 3.0.0-RC1 | 3.3.0 |
How do I fix CVE-2026-84372?
Upgrade predis/predis to 3.3.0 or later.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-84372 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-84372 exists.
Sources
Also known as GHSA-w6f5-v2h6-g786, UBUNTU-CVE-2026-84372.