8

CVE-2026-52831: Nuclio: Unsanitized cron trigger event headers/body injected into CronJob shell command leads to persistent RCE

Deferred
AliasesGHSA-v5px-423j-pf7pGO-2026-5946
Published 02-09-2026Last modified 03-09-2026

Vulnerability summary

CVE-2026-52831 is a high (CVSS 8.0) vulnerability in nuclio. EPSS estimates a 0.53% chance of exploitation in the next 30 days, higher than 45.1% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 8, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
8.0/10
010
High · v3.1 (CVE.org)
EPSS score
0.53%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
OPENSUSE-SU-2026:21483-1

Timeline

  1. 02-09-2026
    PublishedVulnerability first disclosed.
  2. 03-09-2026
    Last modifiedVulnerability information updated.

Description

Nuclio is a "Serverless" framework for Real-Time Events and Data Processing. Prior to version 1.16.4, the Nuclio controller builds a curl invocation string for each cron trigger and stores it as the args of a Kubernetes CronJob container (/bin/sh, -c, <command>). Two fields in the trigger specification flow into this string without adequate sanitization: event.headers keys and event.body. This issue has been patched in version 1.16.4.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.53%

Chance of exploitation in the next 30 days

Percentile

45%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.53% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, administrative account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Github.com/nuclio1 product
  • nuclio< 0.0.0-20260601075854-3356b86a8bfa
Nuclio1 product

2 vendors · 2 products

References

4 links