Predis up to 3.2.x Pipeline write injection

Summaryinfo

A vulnerability described as critical has been identified in Predis up to 3.2.x. This vulnerability affects the function AbstractAggregateConnection::write of the component Pipeline Handler. Executing a manipulation can lead to injection. This vulnerability is handled as CVE-2026-84372. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Predis up to 3.2.x. It has been declared as critical. This vulnerability affects the function AbstractAggregateConnection::write of the component Pipeline Handler. The manipulation with an unknown input leads to a injection vulnerability. The CWE definition for the vulnerability is CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-84372 since 09/01/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1055 by the MITRE ATT&CK project.

Upgrading to version 3.3.0 eliminates this vulnerability.

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Productinfo

Name

• Predis

Version

• 3.0
• 3.1
• 3.2

Website

• Product: https://github.com/predis/predis/

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