CVE-2023-54356 Kyverno before 1.9.5 Sweet32 Medium Strength Cipher Suites
Kyverno supports insecure 3DES cipher suites, allowing attackers to recover plaintext via Sweet32 attacks on long-lived TLS connections.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-54356?
CVE-2023-54356 is a critical vulnerability in kyverno, published on 1 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-326
Which versions are affected by CVE-2023-54356?
4 open source packages ship an affected version, including github.com/kyverno/kyverno and kyverno.
| Package | Affected | Fixed in |
|---|---|---|
github.com/kyverno/kyverno Go | All versions | 1.9.5 |
github.com/kyverno/kyverno Go | All versions | 1.9.5 |
github.com/kyverno/kyverno Go | All versions | 1.9.5 |
kyverno Bitnami | All versions | 1.9.5 |
How do I fix CVE-2023-54356?
Upgrade github.com/kyverno/kyverno to 1.9.5 or later.
Is CVE-2023-54356 being exploited?
There is no known exploitation of CVE-2023-54356 in the wild and no public exploit code.
Sources
Also known as BIT-kyverno-2023-54356, CLEANSTART-2026-MH57563, GHSA-hgv6-w7r3-w4qw, GHSA-x85p-7rrx-px32, GO-2023-1804.