CVE-2026-56748Network attack vector

Authenticated RCE via Pack symlink following

Published Jul 27, 2026 · Updated Jul 27, 2026

Symlink following in Cribl Stream before 4.18.2 allows remote authenticated users to execute code through a crafted Git Pack import. The Git importer preserves a symbolic link in a Pack's functions directory, so pipeline preview resolves and loads code outside the intended Pack tree. Pack import and pipeline preview permissions are both required, and successful exploitation runs arbitrary code with the Cribl server process's privileges.

CVSS severity8.7
High
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Symlink following in Cribl Stream before 4.18.2 allows remote authenticated users to execute code through a crafted Git Pack import. The Git importer preserves a symbolic link in a Pack's functions directory, so pipeline preview resolves and loads code outside the intended Pack tree. Pack import and pipeline preview permissions are both required, and successful exploitation runs arbitrary code with the Cribl server process's privileges.

The record

CVE
CVE-2026-56748
Published
Jul 27, 2026
Updated
Jul 27, 2026
Vendor
Cribl
Product
Cribl Stream
Classifications
CWE-61, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 27, 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.

  1. Affected versionversion=0 <4.18.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Cribl · Cribl Streamversion=0 <4.18.2

Published CVSS scores

8.7CriblCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8CriblCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-61UNIX Symbolic Link (Symlink) Following
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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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