PT-2026-3101 · Istio · Istio

Petrmc · Published 2026-01-15 · Updated 2026-01-16 · CVE-2026-23766

Positive Technologies (AI Summary)

CVSS v3.1

4.1

Medium

Base vector

AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N

Name of the Vulnerable Software and Affected Versions Istio versions through 1.28.2

Description Istio versions through 1.28.2 permit the injection of iptables rules, potentially altering firewall behavior. This is achieved through the traffic.sidecar.istio.io/excludeInterfaces annotation. The reporter notes that this may not represent a security issue, as pod creators can already prevent sidecar injection.

Recommendations Versions prior to 1.28.3 are affected.

Fix

Argument Injection

Weakness Enumeration

CWE-88

Related Identifiers

CVE-2026-23766

Affected Products

Istio

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-23766 · Security Note
• https://osv.dev/vulnerability/CVE-2026-23766 · Vendor Advisory
• https://github.com/istio/istio/pull/58785 · Note
• https://github.com/istio/istio/issues/58781 · Note
• https://twitter.com/CVEnew/status/2011926062922678329 · Twitter Post
• https://twitter.com/VulmonFeeds/status/2011999847675523227 · Twitter Post