Vulnerability · Published Sep 1, 2026 · Assigned by GitHub_M
CVE-2026-84372Predis: Redis command injection and denial of service via CRLF smuggling in pipelined commands on aggregate connections
Critical 9.8
In plain English
A critical-severity security flaw in predis from predis. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Packagist | predis/predis | 3.3.0 | GHSA-w6f5-v2h6-g786 |
| Ubuntu:26.10 | php-nrk-predis | no fix listed | UBUNTU-CVE-2026-84372 |
Affected products (as reported)
Weakness: CWE-93 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- https://github.com/predis/predis/security/advisories/GHSA-w6f5-v2h6-g786 x_refsource_CONFIRM
- https://github.com/predis/predis/issues/1574 x_refsource_MISC
- https://github.com/predis/predis/pull/1586 x_refsource_MISC
- https://github.com/predis/predis/commit/053cb4b6ac7fb1f469ead96a78d059bc0458e408 x_refsource_MISC
- https://github.com/predis/predis/releases/tag/v3.3.0 x_refsource_MISC