Authenticated RCE via Symlink Following in Cribl Stream Pack Git Import
Summary
| CVE | CVE-2026-56748 |
|---|---|
| State | PUBLISHED |
| Assigner | Cribl |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-07-27 20:16:40 UTC |
| Updated | 2026-07-30 19:12:22 UTC |
| 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. |
Risk And Classification
Primary CVSS: v4.0 8.7 HIGH from af879a92-7297-456a-bb0e-905ac6c64bdc
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS: 0.005660000 probability, percentile 0.437740000 (date 2026-08-01)
Problem Types: CWE-61 | CWE-61 CWE-61: UNIX Symbolic Link ('Symlink') Following
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | af879a92-7297-456a-bb0e-905ac6c64bdc | Secondary | 8.7 | HIGH | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/C... |
| 4.0 | CNA | CVSS | 8.7 | HIGH | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N |
| 3.1 | af879a92-7297-456a-bb0e-905ac6c64bdc | Secondary | 8.8 | HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | CNA | CVSS | 8.8 | HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
CVSS v4.0 Breakdown
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS v3.1 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Cribl | Cribl Stream | affected 4.18.2 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| docs.cribl.io/stream/release-notes/release-v4182 | af879a92-7297-456a-bb0e-905ac6c64bdc | docs.cribl.io | |
| trust.cribl.io/notifications | af879a92-7297-456a-bb0e-905ac6c64bdc | trust.cribl.io | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Robert Lackey, Cribl Product Security (en)
Additional Advisory Data
Solutions
CNA: Upgrade Cribl Stream to v4.18.2 or higher. Upgrading fully resolves this vulnerability and no additional mitigation is required.