nuclio: Failure to Sanitize Special Elements into a Different Plane
CVE-2026-29042 is a critical-severity failure to sanitize special elements into a different plane vulnerability in nuclio, with a CVSS 3.1 base score of 9.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected nuclio versions: < 1.15.20. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 2.59% chance of exploitation within 30 days, higher than 86% of scored CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Check which version of nuclio you run against the affected versions below, and install the vendor's latest release.
- Read the advisory on github.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 8.9 | High | CNA (github.com) |
| CVSS 3.1 | 9.8 | Critical | NVD |
Official description
Nuclio is a "Serverless" framework for Real-Time Events and Data Processing. Prior to version 1.15.20, the Nuclio Shell Runtime component contains a command injection vulnerability in how it processes user-supplied arguments. When a function is invoked via HTTP, the runtime reads the X-Nuclio-Arguments header and directly incorporates its value into shell commands without any validation or sanitization. This issue has been patched in version 1.15.20.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Failure to Sanitize Special Elements into a Different Plane
The product does not adequately filter user-controlled input for special elements with control implications.
How developers prevent this class of flaw
- Programming languages and supporting technologies might be chosen which are not subject to these issues.
- Utilize an appropriate mix of allowlist and denylist parsing to filter special element syntax from all input.
More Failure to Sanitize Special Elements into a Different Plane vulnerabilities (CWE-75)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: poc, automatable: yes, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Advisories
- github.com/nuclio/nuclio/security/advisories/GHSA-95fj-3w7g-4r27Exploit, Mitigation
Patches and release notes
Other vulnerabilities in nuclio
- 8.7 High severity
- 8.0 High severity
- 7.1 High severity
- 8.0 High severity
- 8.0 High severity
- 8.3 High severity
Recent Failure to Sanitize Special Elements into a Different Plane vulnerabilities
- 9.8 Critical severity
- 8.8 High severity
- 7.5 High severity
- 8.8 High severity
- 7.2 High severity
- 8.1 High severity
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