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4.1
MEDIUM CVSS 3.1
CVE-2026-23766
Istio Iptables Rule Injection Vulnerability
Description

Rejected reason: DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: none. Reason: This candidate was withdrawn by its CNA. Further investigation showed that it was not a security issue. Notes: none.

INFO

Published Date :

Jan. 15, 2026, 8:16 p.m.

Last Modified :

Feb. 14, 2026, 6:16 p.m.

Remotely Exploit :

No

Source :

[email protected]
Affected Products

The following products are affected by CVE-2026-23766 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Istio istio
: Total Affected Vendor : 1 | Products : 1
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 MEDIUM 8254265b-2729-46b6-b9e3-3dfca2d5bfca
CVSS 3.1 MEDIUM [email protected]
CVSS 3.1 MEDIUM MITRE-CVE
Solution
Mitigate iptables rule injection by validating input and restricting annotation usage.
  • Validate input for the excludeInterfaces annotation.
  • Restrict annotation usage to trusted users.
  • Update Istio to a patched version.
  • Review and harden iptables configurations.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-23766 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-23766 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Rejected by [email protected]

    Feb. 14, 2026

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    Feb. 14, 2026

    Action Type Old Value New Value
    Changed Description Istio through 1.28.2 allows iptables rule injection for changing firewall behavior via the traffic.sidecar.istio.io/excludeInterfaces annotation. NOTE: the reporter's position is "this doesn't represent a security vulnerability (pod creators can already exclude sidecar injection entirely)." Rejected reason: DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: none. Reason: This candidate was withdrawn by its CNA. Further investigation showed that it was not a security issue. Notes: none.
    Removed CVSS V3.1 MITRE: AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N
    Removed CWE MITRE: CWE-88
    Removed Reference MITRE: https://github.com/istio/istio/issues/58781
    Removed Reference MITRE: https://github.com/istio/istio/pull/58785
  • New CVE Received by [email protected]

    Jan. 15, 2026

    Action Type Old Value New Value
    Added Description Istio through 1.28.2 allows iptables rule injection for changing firewall behavior via the traffic.sidecar.istio.io/excludeInterfaces annotation. NOTE: the reporter's position is "this doesn't represent a security vulnerability (pod creators can already exclude sidecar injection entirely)."
    Added CVSS V3.1 AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N
    Added CWE CWE-88
    Added Reference https://github.com/istio/istio/issues/58781
    Added Reference https://github.com/istio/istio/pull/58785
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 4.1
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact