CVE-2026-56748: Authenticated RCE via Symlink Following in Cribl Stream Pack Git Import

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-27 · updated 2026-10-24
Weakness: CWE-61

Description

Improper validation of symbolic links in the Pack Git import feature in Cribl Stream before 4.18.2 allows a remote authenticated attacker with Pack import and pipeline preview permissions to execute arbitrary code as the Cribl server process via a crafted Git repository containing a symbolic link in the pack's functions directory.

Affected products

Cribl Stream: before 4.18.2 — fixed in 4.18.2

How to fix

Upgrade to a fixed version: Cribl Stream 4.18.2. Check the vendor advisory for mitigations.

References

https://docs.cribl.io/stream/release-notes/release-v4182/#security-fixes
https://trust.cribl.io/notifications

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