Redis command injection via pipelined CRLF smuggling
Published Sep 1, 2026 · Updated Sep 2, 2026
CRLF injection in Predis 3.0.0-RC1 through 3.2.0 allows remote attackers to inject Redis commands through pipelined arguments. AbstractAggregateConnection::write() splits an already serialized RESP buffer on CRLF and feeds fragments to Command::deserializeCommand() without honoring RESP length prefixes. Exploitation requires attacker-controlled keys or values in pipeline() on cluster or replication connections; cluster use permits Redis data reads, writes, deletion, and node disruption, while replication use repeatedly crashes affected requests.
Summary
What happened
CRLF injection in Predis 3.0.0-RC1 through 3.2.0 allows remote attackers to inject Redis commands through pipelined arguments. AbstractAggregateConnection::write() splits an already serialized RESP buffer on CRLF and feeds fragments to Command::deserializeCommand() without honoring RESP length prefixes. Exploitation requires attacker-controlled keys or values in pipeline() on cluster or replication connections; cluster use permits Redis data reads, writes, deletion, and node disruption, while replication use repeatedly crashes affected requests.
The record
- CVE
- CVE-2026-84372
- Published
- Sep 1, 2026
- Updated
- Sep 2, 2026
- Vendor
- Predis
- Product
- Predis
- Classifications
- CWE-93, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 1, 2026CVE publishedPublication date reported by the CVE source.
- Sep 2, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=>= 3.0.0-RC1, < 3.3.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- GHSA-w6f5-v2h6-g786 cluster proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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