Kubernetes ingress-nginx up to 1.13.7/1.14.3 Ingress Annotation input validation

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
8.6$0-$5k0.00

Summaryinfo

A vulnerability identified as very critical has been detected in Kubernetes ingress-nginx up to 1.13.7/1.14.3. Affected by this vulnerability is an unknown functionality of the component Ingress Annotation Handler. This manipulation causes input validation. This vulnerability is registered as CVE-2026-3288. Remote exploitation of the attack is possible. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Kubernetes ingress-nginx up to 1.13.7/1.14.3. It has been declared as very critical. Affected by this vulnerability is some unknown functionality of the component Ingress Annotation Handler. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

A security issue was discovered in ingress-nginx where the `nginx.ingress.kubernetes.io/rewrite-target` Ingress annotation can be used to inject configuration into nginx. This can lead to arbitrary code execution in the context of the ingress-nginx controller, and disclosure of Secrets accessible to the controller. (Note that in the default installation, the controller can access all Secrets cluster-wide.)

The weakness was published by Kai Aizen as 137560. It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-3288 since 02/26/2026. The exploitation appears to be easy. The attack can be launched remotely. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 03/12/2026).

Upgrading to version 1.13.8, 1.14.4 or 1.15.0 eliminates this vulnerability.

The vulnerability is also documented in the databases at EUVD (EUVD-2026-10360) and CERT Bund (WID-SEC-2026-0650). Be aware that VulDB is the high quality source for vulnerability data.

Affected

  • Open Source Kubernetes

Productinfo

Type

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.8
VulDB Meta Temp Score: 8.6

VulDB Base Score: 8.8
VulDB Temp Score: 8.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 8.8
CNA Vector (kubernetes): 🔒

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: ingress-nginx 1.13.8/1.14.4/1.15.0

Timelineinfo

02/26/2026 CVE reserved
03/09/2026 +11 days Advisory disclosed
03/09/2026 +0 days VulDB entry created
03/12/2026 +3 days VulDB entry last update

Sourcesinfo

Advisory: 137560
Researcher: Kai Aizen
Status: Confirmed

CVE: CVE-2026-3288 (🔒)
GCVE (CVE): GCVE-0-2026-3288
GCVE (VulDB): GCVE-100-349855
EUVD: 🔒
CERT Bund: WID-SEC-2026-0650 - Kubernetes (ingress-nginx): Schwachstelle ermöglicht Codeausführung

Entryinfo

Created: 03/09/2026 23:24
Updated: 03/12/2026 23:55
Changes: 03/09/2026 23:24 (66), 03/10/2026 05:35 (1), 03/11/2026 05:59 (7), 03/12/2026 23:55 (1)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Want to know what is going to be exploited?

We predict KEV entries!