{"id":"CVE-2025-8556","title":"Github.com/cloudflare/circl: circl-fourq: missing and wrong validation can lead to incorrect results","summary":"A flaw was found in CIRCL's implementation of the FourQ elliptic curve. This vulnerability allows an attacker to compromise session security via low-order point injection and incorrect point validation during Diffie-Hellman key exchange.","severity":"low","cvss":3.7,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","cvssSource":"cna","cwe":["CWE-1287"],"vendor":"Red Hat","product":"circl","affected":["circl < 1.6.1","openshift-builds/openshift-builds-controller-rhel9 (all versions)","openshift-builds/openshift-builds-git-cloner-rhel9 (all versions)","openshift-builds/openshift-builds-image-bundler-rhel9 (all versions)","openshift-builds/openshift-builds-image-processing-rhel9 (all versions)","openshift-builds/openshift-builds-waiters-rhel9 (all versions)","openshift-builds/openshift-builds-webhook-rhel9 (all versions)","custom-metrics-autoscaler/custom-metrics-autoscaler-adapter-rhel9 (all versions)","custom-metrics-autoscaler/custom-metrics-autoscaler-admission-webhooks-rhel9 (all versions)","custom-metrics-autoscaler/custom-metrics-autoscaler-operator-bundle (all versions)","custom-metrics-autoscaler/custom-metrics-autoscaler-rhel9 (all versions)","custom-metrics-autoscaler/custom-metrics-autoscaler-rhel9-operator (all versions)","multicluster-globalhub/multicluster-globalhub-grafana-rhel9 (all versions)","openshift-pipelines/pipelines-chains-controller-rhel8 (all versions)","openshift-pipelines/pipelines-chains-controller-rhel9 (all versions)","openshift-pipelines/pipelines-cli-tkn-rhel8 (all versions)","openshift-pipelines/pipelines-cli-tkn-rhel9 (all versions)","openshift-pipelines/pipelines-controller-rhel8 (all versions)","openshift-pipelines/pipelines-controller-rhel9 (all versions)","openshift-pipelines/pipelines-entrypoint-rhel8 (all versions)","openshift-pipelines/pipelines-entrypoint-rhel9 (all versions)","openshift-pipelines/pipelines-events-rhel8 (all versions)","openshift-pipelines/pipelines-events-rhel9 (all versions)","openshift-pipelines/pipelines-nop-rhel8 (all versions)","openshift-pipelines/pipelines-nop-rhel9 (all versions)","openshift-pipelines/pipelines-operator-bundle (all versions)","openshift-pipelines/pipelines-operator-proxy-rhel8 (all versions)","openshift-pipelines/pipelines-operator-proxy-rhel9 (all versions)","openshift-pipelines/pipelines-operator-webhook-rhel8 (all versions)","openshift-pipelines/pipelines-operator-webhook-rhel9 (all versions)","openshift-pipelines/pipelines-resolvers-rhel8 (all versions)","openshift-pipelines/pipelines-resolvers-rhel9 (all versions)","openshift-pipelines/pipelines-rhel8-operator (all versions)","openshift-pipelines/pipelines-rhel9-operator (all versions)","openshift-pipelines/pipelines-sidecarlogresults-rhel8 (all versions)","openshift-pipelines/pipelines-sidecarlogresults-rhel9 (all versions)","openshift-pipelines/pipelines-webhook-rhel8 (all versions)","openshift-pipelines/pipelines-webhook-rhel9 (all versions)","openshift-pipelines/pipelines-workingdirinit-rhel8 (all versions)","openshift-pipelines/pipelines-workingdirinit-rhel9 (all versions)","openshift-serverless-1/kn-client-cli-artifacts-rhel8 (all versions)","openshift-serverless-1/kn-client-kn-rhel8 (all versions)","openshift-serverless-1/kn-plugin-event-sender-rhel8 (all versions)","openshift-serverless-1/kn-plugin-func-func-util-rhel8 (all versions)","openshift-service-mesh-dev-preview-beta/istio-ztunnel-rhel9 (all versions)","openshift-service-mesh/istio-cni-rhel9 (all versions)","openshift-service-mesh/istio-must-gather-rhel9 (all versions)","openshift-service-mesh/istio-pilot-rhel9 (all versions)","openshift-service-mesh/istio-proxyv2-rhel9 (all versions)","openshift-service-mesh/istio-rhel9-operator (all versions)"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2025-08-06T20:24:48.827225Z"},"published":"2025-08-06","updated":"2026-10-27","sourceUpdated":"2026-10-27T05:42:41.489Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-8556","references":[{"url":"https://access.redhat.com/security/cve/CVE-2025-8556"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2371624","label":"RHBZ#2371624"},{"url":"https://github.com/cloudflare/circl"},{"url":"https://github.com/cloudflare/circl/security/advisories/GHSA-2x5j-vhc8-9cwm"},{"url":"https://github.com/cloudflare/circl/tree/v1.6.1"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-8556"},{"url":"https://news.ycombinator.com/item?id=45669593"},{"url":"https://www.botanica.software/blog/cryptographic-issues-in-cloudflares-circl-fourq-implementation"}],"tags":["cve.org","osv","go"],"epss":0.00531,"epssPercentile":0.44701,"aliases":["GHSA-2x5j-vhc8-9cwm","GO-2025-3754"],"ecosystem":"go","patched":["github.com/cloudflare/circl 1.6.1"],"ingestedAt":"2026-09-12T03:13:01.747Z","slug":"CVE-2025-8556","body":"## Overview\n\nA flaw was found in CIRCL's implementation of the FourQ elliptic curve. This vulnerability allows an attacker to compromise session security via low-order point injection and incorrect point validation during Diffie-Hellman key exchange.\n\n## Affected\n\n- `circl < 1.6.1`\n- `openshift-builds/openshift-builds-controller-rhel9 (all versions)`\n- `openshift-builds/openshift-builds-git-cloner-rhel9 (all versions)`\n- `openshift-builds/openshift-builds-image-bundler-rhel9 (all versions)`\n- `openshift-builds/openshift-builds-image-processing-rhel9 (all versions)`\n- `openshift-builds/openshift-builds-waiters-rhel9 (all versions)`\n- `openshift-builds/openshift-builds-webhook-rhel9 (all versions)`\n- `custom-metrics-autoscaler/custom-metrics-autoscaler-adapter-rhel9 (all versions)`\n- `custom-metrics-autoscaler/custom-metrics-autoscaler-admission-webhooks-rhel9 (all versions)`\n- `custom-metrics-autoscaler/custom-metrics-autoscaler-operator-bundle (all versions)`\n- `custom-metrics-autoscaler/custom-metrics-autoscaler-rhel9 (all versions)`\n- `custom-metrics-autoscaler/custom-metrics-autoscaler-rhel9-operator (all versions)`\n- `multicluster-globalhub/multicluster-globalhub-grafana-rhel9 (all versions)`\n- `openshift-pipelines/pipelines-chains-controller-rhel8 (all versions)`\n- `openshift-pipelines/pipelines-chains-controller-rhel9 (all versions)`\n- `openshift-pipelines/pipelines-cli-tkn-rhel8 (all versions)`\n- `openshift-pipelines/pipelines-cli-tkn-rhel9 (all versions)`\n- `openshift-pipelines/pipelines-controller-rhel8 (all versions)`\n- `openshift-pipelines/pipelines-controller-rhel9 (all versions)`\n- `openshift-pipelines/pipelines-entrypoint-rhel8 (all versions)`\n- `openshift-pipelines/pipelines-entrypoint-rhel9 (all versions)`\n- `openshift-pipelines/pipelines-events-rhel8 (all versions)`\n- `openshift-pipelines/pipelines-events-rhel9 (all versions)`\n- `openshift-pipelines/pipelines-nop-rhel8 (all versions)`\n- `openshift-pipelines/pipelines-nop-rhel9 (all versions)`\n- `openshift-pipelines/pipelines-operator-bundle (all versions)`\n- `openshift-pipelines/pipelines-operator-proxy-rhel8 (all versions)`\n- `openshift-pipelines/pipelines-operator-proxy-rhel9 (all versions)`\n- `openshift-pipelines/pipelines-operator-webhook-rhel8 (all versions)`\n- `openshift-pipelines/pipelines-operator-webhook-rhel9 (all versions)`\n- `openshift-pipelines/pipelines-resolvers-rhel8 (all versions)`\n- `openshift-pipelines/pipelines-resolvers-rhel9 (all versions)`\n- `openshift-pipelines/pipelines-rhel8-operator (all versions)`\n- `openshift-pipelines/pipelines-rhel9-operator (all versions)`\n- `openshift-pipelines/pipelines-sidecarlogresults-rhel8 (all versions)`\n- `openshift-pipelines/pipelines-sidecarlogresults-rhel9 (all versions)`\n- `openshift-pipelines/pipelines-webhook-rhel8 (all versions)`\n- `openshift-pipelines/pipelines-webhook-rhel9 (all versions)`\n- `openshift-pipelines/pipelines-workingdirinit-rhel8 (all versions)`\n- `openshift-pipelines/pipelines-workingdirinit-rhel9 (all versions)`\n- `openshift-serverless-1/kn-client-cli-artifacts-rhel8 (all versions)`\n- `openshift-serverless-1/kn-client-kn-rhel8 (all versions)`\n- `openshift-serverless-1/kn-plugin-event-sender-rhel8 (all versions)`\n- `openshift-serverless-1/kn-plugin-func-func-util-rhel8 (all versions)`\n- `openshift-service-mesh-dev-preview-beta/istio-ztunnel-rhel9 (all versions)`\n- `openshift-service-mesh/istio-cni-rhel9 (all versions)`\n- `openshift-service-mesh/istio-must-gather-rhel9 (all versions)`\n- `openshift-service-mesh/istio-pilot-rhel9 (all versions)`\n- `openshift-service-mesh/istio-proxyv2-rhel9 (all versions)`\n- `openshift-service-mesh/istio-rhel9-operator (all versions)`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n### Workarounds\n\nMitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.\n\n## Package advisory (CVE-2025-8556)\n\nAffected packages:\n\n- `github.com/cloudflare/circl < 1.6.1`\n\nPatched in:\n\n- `github.com/cloudflare/circl 1.6.1`\n\nSource: https://osv.dev/vulnerability/GHSA-2x5j-vhc8-9cwm","depth":"sunlit","depthScore":20,"depthScoreParts":{"impact":20.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}