# CVE-2023-54356: Kyverno weak cipher suite support in TLS

Source: https://junglewise.ai/threats/cve-2023-54356-kyverno-weak-cipher-suite-support-in-tls  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-01. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2023-54356 · Severity: low · CVSS 3.7 · Published 2026-09-01

Kyverno, a policy management tool for Kubernetes, enables legacy and weak 3DES cipher suites on its TLS endpoints. These deprecated ciphers are vulnerable to cryptanalytic attacks (Sweet32) that could allow attackers to recover small amounts of encrypted data over long-lived connections with high traffic volumes. This primarily affects administrators managing container security policies and could weaken the security of communications with Kyverno services.

Technologies: [github.com/kyverno/kyverno (Go)](https://junglewise.ai/threats/technologies/github-com-kyverno-kyverno), [Kyverno](https://junglewise.ai/threats/technologies/kyverno). Vendors: [Go](https://junglewise.ai/threats/vendors/go), [Kyverno](https://junglewise.ai/threats/vendors/kyverno).

## Quick answers

**Is CVE-2023-54356 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2023-54356 being exploited in the wild.

**How severe is CVE-2023-54356?** Low severity, with a CVSS score of 3.7, published 1 September 2026.

**Which products and versions are affected?** github.com/kyverno/kyverno (Go) SEMVER:introduced=0,fixed=1.9.5; Kyverno ≤1.9.4.

**Is there a fix for CVE-2023-54356?** Yes. github.com/kyverno/kyverno (Go): upgrade to 1.9.5 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2023-54356 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2023-54356?** Check whether you run github.com/kyverno/kyverno (Go) or Kyverno at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/kyverno/kyverno (Go): upgrade to 1.9.5 or later

  ```sh
  go get github.com/kyverno/kyverno@v1.9.5
  ```


## Technical details

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 TLS endpoints. These 64-bit block ciphers are vulnerable to the Sweet32 attack (CVE-2016-2183), a plaintext recovery attack that requires long-lived TLS connections carrying large volumes of traffic. The vulnerability is a weak cryptographic configuration issue rather than a protocol flaw. The issue is fixed in Kyverno 1.9.5 and 1.10.0. No exploitation in the wild is known.

## Affected products

- Kyverno Kyverno ≤1.9.4

## Identifiers

- CVE-2023-54356
- GHSA-hgv6-w7r3-w4qw
- GO-2023-1804

## Timeline

- 2023-05-29: disclosed
- 2023: patched: Fixed in Kyverno 1.9.5 and 1.10.0

## References

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

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