Sigstore Timestamp Authority: Denial of Service via excessive OID or Content-Type header parsing
CVE: CVE-2025-66564
Component: github.com/sigstore/timestamp-authority
CWE: CWE-405
Severity: Important
CVSS v3: 7.5/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Release date: 2025-12-04T22:37:13.307000+00:00

A flaw was found in Sigstore Timestamp Authority. This vulnerability allows a denial of service via excessive memory allocation when processing a specially crafted Object Identifier or Content-Type header.

Statement: This vulnerability is rated Important for Red Hat products. The Sigstore Timestamp Authority, a service for issuing RFC 3161 timestamps, is prone to excessive memory allocation. This occurs when processing untrusted OID payloads with many period characters or malformed Content-Type headers. An unauthenticated attacker could exploit this flaw to trigger a denial of service in affected Red Hat products that utilize this component.

Remediation:
Before applying this update, make sure all previously released errata relevant to your
system have been applied. For details on how to apply this update, refer to:
  
https://docs.openshift.com/container-platform/latest/updating/updating_a_cluster/updating-cluster-cli.html
If you are using an earlier version of RHACS, you are advised to
upgrade to the version of RHACS mentioned in the synopsis and release
notes in order to take advantage of the enhancements, bug fixes, and/or
security patches in the release.
If you are using an earlier version of RHACS, you are advised to
upgrade to the version of RHACS mentioned in the synopsis and release
notes in order to take advantage of the enhancements, bug fixes, and/or
security patches in the release.
If you are using an earlier version of RHACS, you are advised to
upgrade to the version of RHACS mentioned in the synopsis and release
notes in order to take advantage of the enhancements, bug fixes, and/or
security patches in the release.
Red Hat OpenShift Pipelines is a cloud-native, continuous integration and
continuous delivery (CI/CD) solution based on Kubernetes resources.
It uses Tekton building blocks to automate deployments across multiple
platforms by abstracting away the underlying implementation details.
Tekton introduces a number of standard custom resource definitions (CRDs)
for defining CI/CD pipelines that are portable across Kubernetes distributions.
Red Hat OpenShift Pipelines is a cloud-native, continuous integration and
continuous delivery (CI/CD) solution based on Kubernetes resources.
It uses Tekton building blocks to automate deployments across multiple
platforms by abstracting away the underlying implementation details.
Tekton introduces a number of standard custom resource definitions (CRDs)
for defining CI/CD pipelines that are portable across Kubernetes distributions.
Red Hat OpenShift Pipelines is a cloud-native, continuous integration and
continuous delivery (CI/CD) solution based on Kubernetes resources.
It uses Tekton building blocks to automate deployments across multiple
platforms by abstracting away the underlying implementation details.
Tekton introduces a number of standard custom resource definitions (CRDs)
for defining CI/CD pipelines that are portable across Kubernetes distributions.
Red Hat Trusted Artifact Signer simplifies cryptographic signing and verifying of software artifacts such as container images, binaries and source code changes. It is a self-managed on-premise deployment of the Sigstore project available at https://sigstore.dev

Platform Engineers, Software Developers and Security Professionals may use RHTAS to ensure the integrity, transparency and assurance of their organization's software supply chain.

For details on using the operator, refer to the product documentation at https://access.redhat.com/documentation/en-us/red_hat_trusted_artifact_signer/1.3

You can find the release notes for this version of Red Hat Trusted Artifact Signer at https://access.redhat.com/documentation/en-us/red_hat_trusted_artifact_signer/1.3/html-single/release_notes/index
Red Hat Trusted Artifact Signer simplifies cryptographic signing and verifying of software artifacts such as container images, binaries and source code changes. It is a self-managed on-premise deployment of the Sigstore project available at https://sigstore.dev

Platform Engineers, Software Developers and Security Professionals may use RHTAS to ensure the integrity, transparency and assurance of their organization's software supply chain.

For details on using the operator, refer to the product documentation at https://access.redhat.com/documentation/en-us/red_hat_trusted_artifact_signer/1.3

You can find the release notes for this version of Red Hat Trusted Artifact Signer at https://access.redhat.com/documentation/en-us/red_hat_trusted_artifact_signer/1.3/html-single/release_notes/index