GitHub Advisoryadvisory · NuGet

GHSA-4v55-cpmv-3vcm CoreWCF: WS-Security Reference DigestMethod Algorithm-Suite Bypass

LOW Published 2026-06-19 Modified 2026-06-19 Official page ↗
Aliases
CVE-2026-54780
Ecosystem
NuGet
Packages
CoreWCF.Primitives
Severity
Low
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Weaknesses
CWE-327, CWE-757
Reviewed
2026-06-19

Affected packages

• NuGet CoreWCF.Primitives: < 1.8.1 → fixed in 1.8.1 • NuGet CoreWCF.Primitives: >= 1.9.0, < 1.9.1 → fixed in 1.9.1

Description

Impact CoreWCF’s WS-Security 1.0 receive pipeline validates the `SignatureMethod` of an incoming `ds:SignedInfo` against the configured `SecurityAlgorithmSuite`, but does not validate the `DigestMethod` declared on each `ds:Reference`. As a result, a sender can populate `ds:SignedInfo` with `SignatureMethod` values the suite accepts (for example rsa-sha256 under Basic256Sha256) while declaring a per-reference `DigestMethod` the suite rejects (for example http://www.w3.org/2000/09/xmldsig#sha1). The signature is then verified where it permits SHA-1 digests, and the message is accepted. Patches Fixed in CoreWCF v1.8.1 and v1.9.1 Workarounds None

Related

Alias · CVE (1)

  • CVE-2026-54780 CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. vulnerability

Weakness · CWE (2)

  • CWE-327 Use of a Broken or Risky Cryptographic Algorithm weakness
  • CWE-757 Selection of Less-Secure Algorithm During Negotiation weakness

References