What’s Vulnerable › Vulnerabilities

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

• Severity: low (CVSS 3.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-01 · updated 2026-10-08
• Weakness: CWE-326

Description

Kyverno versions 1.9.4 and earlier support insecure 3DES cipher suites (TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA and TLS_RSA_WITH_3DES_EDE_CBC_SHA) 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 products

• kyverno: before 1.9.5, 1.10.0 — fixed in 1.10.0, 1.9.5

How to fix

Upgrade to a fixed version: kyverno 1.10.0, 1.9.5. Check the vendor advisory for mitigations.

References

• https://github.com/kyverno/kyverno/security/advisories/GHSA-hgv6-w7r3-w4qw
• https://www.vulncheck.com/advisories/kyverno-before-1.9.5-sweet32-medium-strength-cipher-suites

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