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TI-2025-40975 Aliases CVE-2025-66564GHSA-4qg8-fj49-pxjh

Sigstore Timestamp Authority allocates excessive memory during request parsing

Priority LOW 39CWE-405Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 6 fixed, 5 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat.

Summary

Sigstore Timestamp Authority is a service for issuing RFC 3161 timestamps. Prior to 2.0.3, Function api.ParseJSONRequest currently splits (via a call to strings.Split) an optionally-provided OID (which is untrusted data) on periods. Similarly, function api.getContentType splits the Content-Type header (which is also untrusted data) on an application string. As a result, in the face of a malicious request with either an excessively long OID in the payload containing many period characters or a malformed Content-Type header, a call to api.ParseJSONRequest or api.getContentType incurs allocations of O(n) bytes (where n stands for the length of the function's argument). This vulnerability is fixed in 2.0.3.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00475 41st percentileScored 2026-11-07
Fix Partial timestamp-authority (sigstore): 2.0.3github.com/sigstore/timestamp-authority (Go): 2.0.3Red Hat: 10 advisoriesRed Hat: 6 fixed, 5 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
sigstoretimestamp-authoritybefore 2.0.32.0.3Patch availableCNA
—github.com/sigstore/timestamp-authority (Go)before 2.0.32.0.3Patch availableGHSA-4qg8-fj49-pxjh
  • timestamp-authority Vendorsigstore Affected before 2.0.3 Fixed in 2.0.3 Patch available CNA
  • github.com/sigstore/timestamp-authority (Go) Vendor— Affected before 2.0.3 Fixed in 2.0.3 Patch available GHSA-4qg8-fj49-pxjh

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:linuxfoundation:sigstore_timestamp_authority:*:*:*:*:*:*:*:*before 2.0.3Vulnerablebackstage
  • cpe:2.3:a:linuxfoundation:sigstore_timestamp_authority:*:*:*:*:*:*:*:* Versions before 2.0.3 Vulnerable ·backstage

Remediation

  • Fix · CNA timestamp-authority (sigstore) Fixed in 2.0.3
  • Fix · GHSA-4qg8-fj49-pxjh github.com/sigstore/timestamp-authority (Go) Fixed in 2.0.3 Advisory →

Red Hat 10 advisories

  • RHSA-2026:3827 Released 2026-03-05 · Red Hat rating Important
    Red Hat OpenShift Pipelines Release 1.20.3
    • Red Hat OpenShift Pipelines 1.20 registry.redhat.io/openshift-pipelines/pipelines-cli-tkn-rhel9, registry.redhat.io/openshift-pipelines/pipelines-serve-tkn-cli-rhel9
  • RHSA-2026:3825 Released 2026-03-05 · Red Hat rating Important
    Red Hat OpenShift Pipelines Release 1.20.3
    • Red Hat OpenShift Pipelines 1.20 registry.redhat.io/openshift-pipelines/pipelines-chains-controller-rhel9, registry.redhat.io/openshift-pipelines/pipelines-console-plugin-rhel9
  • RHSA-2026:3712 Released 2026-03-04 · Red Hat rating Important
    Red Hat OpenShift Pipelines Release 1.15.4
    • Red Hat OpenShift Pipelines 1.15 registry.redhat.io/openshift-pipelines/pipelines-chains-controller-rhel8, registry.redhat.io/openshift-pipelines/pipelines-console-plugin-rhel8, registry.redhat.io/openshift-pipelines/pipelines-hub-api-rhel8 +2
Show 7 more Red Hat advisories
  • RHSA-2026:3710 Released 2026-03-04 · Red Hat rating Important
    Red Hat OpenShift Pipelines Release 1.15.3
    • Red Hat OpenShift Pipelines 1.15 registry.redhat.io/openshift-pipelines/pipelines-chains-controller-rhel8, registry.redhat.io/openshift-pipelines/pipelines-console-plugin-rhel8, registry.redhat.io/openshift-pipelines/pipelines-hub-api-rhel8 +2
  • RHSA-2026:3087 Released 2026-02-23 · Red Hat rating Important
    RHTAS 1.3.2 - Red Hat Trusted Artifact Signer Release
    • Red Hat Trusted Artifact Signer 1.3 registry.redhat.io/rhtas/rhtas-console-rhel9, registry.redhat.io/rhtas/rhtas-console-ui-rhel9
  • RHSA-2026:2852 Released 2026-02-17 · Red Hat rating Important
    OpenShift Security Profiles Operator bug fix and enhancement update
    • OpenShift Security Profiles Operator 1 registry.redhat.io/compliance/openshift-security-profiles-operator-bundle, registry.redhat.io/compliance/openshift-security-profiles-rhel8-operator
  • RHSA-2026:2568 Released 2026-02-11 · Red Hat rating Important
    RHACS 4.9.3 security and bug fix update
    • Red Hat Advanced Cluster Security 4.9 registry.redhat.io/advanced-cluster-security/rhacs-central-db-rhel8, registry.redhat.io/advanced-cluster-security/rhacs-collector-rhel8, registry.redhat.io/advanced-cluster-security/rhacs-main-rhel8 +6
  • RHSA-2026:2350 Released 2026-02-09 · Red Hat rating Important
    RHACS 4.9.3 security and bug fix update
    • Red Hat Advanced Cluster Security 4.9 registry.redhat.io/advanced-cluster-security/rhacs-central-db-rhel8, registry.redhat.io/advanced-cluster-security/rhacs-collector-rhel8, registry.redhat.io/advanced-cluster-security/rhacs-main-rhel8 +6
  • RHSA-2026:2144 Released 2026-02-05 · Red Hat rating Important
    RHTAS 1.3.2 - Red Hat Trusted Artifact Signer Release
    • Red Hat Trusted Artifact Signer 1.3 registry.redhat.io/rhtas/certificate-transparency-rhel9, registry.redhat.io/rhtas/fulcio-rhel9, registry.redhat.io/rhtas/rekor-backfill-redis-rhel9 +7
  • RHSA-2026:1517 Released 2026-01-28 · Red Hat rating Important
    RHACS 4.8.8 security and bug fix update
    • Red Hat Advanced Cluster Security 4.8 registry.redhat.io/advanced-cluster-security/rhacs-central-db-rhel8, registry.redhat.io/advanced-cluster-security/rhacs-collector-rhel8, registry.redhat.io/advanced-cluster-security/rhacs-main-rhel8 +8

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
OpenShift PipelinesAffectedNo fix yet
OpenShift ServerlessAffectedNo fix planned: Will not fix
Red Hat Advanced Cluster Security 4AffectedNo fix yet
Red Hat OpenShift Dev SpacesAffectedNo fix yet
Zero Trust Workload Identity Manager - Tech PreviewAffectedNo fix yet
Red Hat Advanced Cluster Security 4.8Fixed RHSA-2026:1517
Red Hat Advanced Cluster Security 4.9Fixed RHSA-2026:2350, RHSA-2026:2568
Red Hat OpenShift Pipelines 1.15Fixed RHSA-2026:3710
Red Hat OpenShift Pipelines 1.2Fixed RHSA-2026:3825, RHSA-2026:3827
Red Hat Trusted Artifact Signer 1.3Fixed RHSA-2026:2144, RHSA-2026:3087
Security Profiles Operator 1Fixed RHSA-2026:2852
Not affected: 9 products
  • Red Hat Advanced Cluster Security 4
  • Red Hat Advanced Cluster Security 4.8
  • Red Hat Advanced Cluster Security 4.9
  • Red Hat OpenShift Container Platform 4
  • Red Hat OpenShift Pipelines 1.15
  • Red Hat OpenShift Pipelines 1.2
  • Red Hat Trusted Artifact Signer
  • Red Hat Trusted Artifact Signer 1.3
  • Security Profiles Operator 1

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-66564
  2. 2026-10-03 Alias added: GHSA-4qg8-fj49-pxjh

References

Patch 1

Advisory 2

Other 1

  • TI-2022-16356 False positive signature verification in cosign CVSS 3.1CRITICAL 9.8
  • TI-2026-36084 sigstore-js: `certificateOIDs` verification constraints are silently dropped and never enforced CVSS 3.1HIGH 7.5
  • TI-2024-19670 Cosign vulnerable to machine-wide denial of service via malicious artifacts CVSS 3.1HIGH 7.5
  • TI-2026-18290 Fulcio vulnerable to Server-Side Request Forgery (SSRF) via MetaIssuer Regex Bypass CVSS 3.1MEDIUM 5.8
  • TI-2026-36085 sigstore-js: Insufficient Verification of Data Authenticity CVSS 3.1MEDIUM 6.5
  • TI-2024-19669 Cosign vulnerable to system-wide denial of service via malicious attachments CVSS 3.1MEDIUM 5.9
See all 39 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences