CVE-2023-54356: Kyverno before 1.9.5 Sweet32 Medium Strength Cipher Suites

Q: What conditions are required for exploitation?

An attacker would need a very long-lived TLS connection that carries large volumes of traffic and negotiates one of the affected 3DES cipher suites. Under those conditions, the Sweet32 attack could recover small amounts of plaintext.

Q: Which TLS cipher suites indicate exposure?

Affected TLS endpoints support TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA or TLS_RSA_WITH_3DES_EDE_CBC_SHA. Kyverno 1.9.5 and 1.10.0 contain the fix.

Published Sep 1, 2026

Updated

Kyverno versions 1.9.4 and earlier support insecure 3DES cipher suites (TLSECDHERSAWITH3DESEDECBCSHA and TLSRSAWITH3DESEDECBCSHA) on their TLS endpoints. These 64-bit block ciphers are vulnerable to the Sweet32 attack (CVE-2016-2183), which, over very long-lived TLS connections carrying large volumes of traffic, could allow an attacker to recover small amounts of plaintext. The issue is fixed in Kyverno 1.9.5 and 1.10.0.

Affected Software

1 affected component

kyverno<1.9.5

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade Kyverno to a version that resolves this vulnerability.
Fixed in 1.9.5
Upgrade
Upgrade Kyverno to a version that resolves this vulnerability.
Fixed in 1.10.0

Event History

Sep 1, 2026

CVE Published

via MITRE·11:33 AM

Data Sourced

via MITRE·11:33 AM

DescriptionSeverityWeakness

Frequently Asked Questions

What conditions are required for exploitation?

An attacker would need a very long-lived TLS connection that carries large volumes of traffic and negotiates one of the affected 3DES cipher suites. Under those conditions, the Sweet32 attack could recover small amounts of plaintext.

Which TLS cipher suites indicate exposure?