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Fencer Vulns
low 2.2

CVE-2026-93600 json

rustls webpki Name Constraints URI Validation Bypass

published 2026-04-14 6 mo ago modified 2026-09-22 47 d ago also GHSA-965h-392x-2mh5 , RUSTSEC-2026-0098 , EUVD-2026-82895

cvss
2.2
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 10%
public exploits
0
none known

Summary

rustls-webpki (rustls/webpki) versions 0.101.0 through 0.103.11 and 0.104.0-alpha releases before 0.104.0-alpha.6 ignore X.509 name constraints that apply to URI names, causing such constraints to be accepted rather than enforced. Because name constraints are restrictions on otherwise properly issued certificates, the flaw is only reachable after successful signature verification and requires a misissued certificate to exploit; the library also provides no API for asserting URI names, and URI name constraints are otherwise unimplemented. Versions 0.103.12 and 0.104.0-alpha.6 reject URI name constraints unconditionally.

Patch / fix

  • crates.io rustls-webpki 0.103.12, 0.104.0-alpha.6
  • rustls webpki 0.103.12, 0.104.0-alpha.6
  • rust-rustls-webpki Debian 14 0.103.13+ds-1

debian advisories DEBIAN-CVE-2026-93600

  • aws-nitro-enclaves-cli SLE Module for Public Cloud 15 SP7, SLE Module for Public Cloud 15 SP6 1.5.2~git0.1c496ed-150600.10.18.1
  • aws-nitro-enclaves-cli SLES for SAP applications 16.0, SLES 16.0 1.5.2~git0.1c496ed-160000.1.1
  • rustup SLES for SAP applications 16.0, SLES 16.0 1.29.1~0-160000.1.1
  • sccache SLES for SAP applications 16.0, SLES 16.0 0.18.0~2-160000.1.1

suse advisories SUSE-SU-2026:5066-1SUSE-SU-2026:24467-1SUSE-SU-2026:24014-1SUSE-SU-2026:23983-1

  • zed openSUSE Tumbleweed 1.24.2-1.1
  • aws-nitro-enclaves-cli openSUSE Leap 16.0 1.5.2~git0.1c496ed-160000.1.1
  • shadowsocks-libev openSUSE Leap 16.0 3.3.6-bp160.3.1
  • shadowsocks-rust openSUSE Leap 16.0 1.25.0-bp160.1.1
  • sequoia-sq openSUSE Leap 16.0 1.5.0-bp160.1.1
  • rustup openSUSE Leap 16.0 1.29.1~0-160000.1.1
  • sccache openSUSE Leap 16.0 0.18.0~2-160000.1.1
  • python-tokenizers openSUSE Tumbleweed 0.23.2-1.1

opensuse advisories openSUSE-SU-2026:12355-1openSUSE-SU-2026:22175-1openSUSE-SU-2026:22189-1openSUSE-RU-2026:22132-1openSUSE-SU-2026:22016-1openSUSE-SU-2026:21982-1

  • kata-containers-cc Azure Linux 3.0 3.15.0.aks0-23

azure linux advisories AZL-103466

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-93600 updated cvss 2.2

rustls-webpki: rustls-webpki: URI Name Constraint Bypass via X.509 Certificate Misissue

  • Red Hat Confidential Cluster Operator confidential-clusters-beta/compute-pcrs-rhel9, confidential-clusters-beta/registration-server-rhel9, confidential-clusters-beta/attestation-key-register-rhel9, confidential-clusters-beta/confidential-cluster-rhel9-operator, confidential-clusters-beta/confidential-cluster-operator-bundle Red Hat Confidential Compute Attestation build-of-trustee/trustee-rhel9
    affected: no fix available “Fix deferred”
  • Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/vector-rhel9 Red Hat Migration Toolkit for Applications 8 mta/mta-dotnet-external-provider-rhel9
    affected: no fix planned “Out of support scope”
  • Red Hat OpenShift Lightspeed openshift-lightspeed/lightspeed-ocp-rag-rhel9, openshift-lightspeed-tech-preview/lightspeed-rag-tool-rhel9, openshift-lightspeed/lightspeed-to-dataverse-exporter-rhel9
    affected: no fix available “Fix deferred”
  • Red Hat OpenShift Service Mesh 3 openshift-service-mesh/istio-ztunnel-rhel9
    affected: no fix planned “Out of support scope”
  • Red Hat Pen Drive Powered by Red Hat Lightspeed pen-drive/pen-drive-scanner-rhel9
    affected: no fix available “Fix deferred”
  • Red Hat Ansible Automation Platform 2 ansible-automation-platform-26/hub-rhel9, ansible-automation-platform-27/hub-rhel9, ansible-automation-platform-26/gateway-rhel9, ansible-automation-platform-27/gateway-rhel9, ansible-automation-platform-24/lightspeed-rhel8, ansible-automation-platform-25/lightspeed-rhel8, +13 more
    affected: no fix available, no fix planned “Out of support scope”
  • Red Hat Ansible Automation Platform Ansible Core 2 ansible-automation-platform-tech-preview/ee-minimal-rhel8, ansible-automation-platform-tech-preview/ee-minimal-rhel9 Red Hat Enterprise Linux 9 coreos-installer, coreos-installer-dracut, coreos-installer-bootinfra, clevis-pin-trustee 0.1.0-4.el10, trustee-guest-components 0.10.0^124.git0061d03-3.el10 Red Hat Enterprise Linux 10 trustee 0.15.0-2.el10, clevis-pin-trustee 0.1.0-4.el10, rust-coreos-installer 0.26.0-1.el10_2, trustee-guest-components 0.10.0^124.git0061d03-3.el10 Red Hat OpenShift AI (RHOAI) rhoai/odh-llm-d-inference-scheduler-rhel9, rhoai/odh-fms-guardrails-orchestrator-rhel9, rhoai/odh-ml-pipelines-runtime-generic-rhel9, rhoai/odh-model-registry-job-async-upload-rhel9, rhoai/odh-trustyai-garak-lls-provider-dsp-rhel9 Red Hat OpenShift Container Platform 4 conmon-rs, coreos-installer, coreos-installer-dracut, coreos-installer-bootinfra Red Hat OpenShift Container Platform 5 conmon-rs
    +4 more products
    Red Hat OpenShift Update Service openshift-update-service/openshift-update-service-rhel8 Red Hat Satellite 6 satellite/iop-vmaas-rhel9, satellite/iop-host-inventory-rhel9, satellite/iop-vulnerability-engine-rhel9 Red Hat Trusted Artifact Signer rhtas/tuffer-rhel9, rhtas/tuftool-rhel9 Red Hat Trusted Profile Analyzer rhtpa/rhtpa-rhel10, rhtpa/rhtpa-trustification-service-rhel9
    affected: no fix available “Fix deferred”
  • Red Hat Ansible Automation Orchestrator 2026 ansible-automation-platform/automation-orchestrator-backend-rhel9 Red Hat Confidential Compute Attestation agent-sandbox/agent-sandbox-router, openshift-sandboxed-containers/osc-podvm-builder-rhel9, openshift-sandboxed-containers/osc-podvm-payload-rhel9 Red Hat Lightspeed Services for Advanced Cluster Management lightspeed-services-acm/ocp-rules-rhel9 Red Hat Ansible Automation Platform 2 ansible-automation-platform-26/mcp-tools-rhel9, ansible-automation-platform-27/mcp-tools-rhel9, ansible-automation-platform-26/de-minimal-rhel9, ansible-automation-platform-26/ee-minimal-rhel9, ansible-automation-platform-27/de-minimal-rhel9, ansible-automation-platform-27/ee-minimal-rhel9, +5 more Red Hat Ansible Automation Platform Ansible Core 2 ansible-automation-platform/ee-minimal-rhel8, ansible-automation-platform/ee-minimal-rhel9 Red Hat Discovery 2 discovery/discovery-server-rhel9
    +13 more products
    Red Hat Enterprise Linux 7 firefox, firefox 140.16.0-1.el10_2 Red Hat Enterprise Linux 8 rls, rust, cargo, clippy, rustfmt, rust-gdb, +10 more Red Hat Enterprise Linux 9 ctdb, rust, cargo, goose, samba, clippy, +68 more Red Hat Enterprise Linux 10 mesa 26.1.1-2.el10, rust 1.98.1-1.el10, goose 1.38.0-1.el10_2, samba 4.23.5-110.el10_2, firefox 140.16.0-1.el10_2, rpm-ostree 2026.2-2.el10_2, +4 more Red Hat Enterprise Linux AI (RHEL AI) 3 rust 1.98.1-1.el10 Red Hat Enterprise Linux command line assistant rhel-cla/rhel-knowledge-bridge-rhel10 Red Hat Hardened Images rust 1.98.1-1.el10, chunkah 0.6.0-3.hum1, netavark 2.1.0-1.hum1, nodejs26 26.9.0-0.1.hum1, aardvark-dns 2.1.0-1.hum1, openshell 0.0.100-0.2.hum1, +2 more Red Hat Lightspeed Services for OCP lightspeed-services-ocp/ocp-rules-rhel9 Red Hat OpenShift AI (RHOAI) rhoai/odh-feature-server-rhel9, rhai/base-image-torch-2.14-cpu-rhel9, rhai/base-image-torch-2.14-cuda-13.0-rhel9 Red Hat OpenShift Container Platform 4 kata-containers Red Hat OpenShift Container Platform 5 kata-containers Red Hat Quay 3 quay/quay-rhel8, quay/quay-rhel9, redhat-user-workloads/quay-eng-tenant/quay-quay-v3-9 Red Hat Satellite 6 python-maturin 1.8.2-1.el9pc, python3.12-maturin 1.7.1-2.el9sat, satellite/iop-advisor-engine-rhel9, satellite/iop-advisor-backend-rhel9
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
49 d ago

Exploit prediction

0.20% chance of exploitation in the next 30 days, higher than 10% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 2.1 CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
CNA 3.1 2.2 CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N
CNA 4.0 2.1 CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
GitHub 3.1 2.2 CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N

Affected packages

ecosystem package affected fixed in
crates.io rustls-webpki
>=0.101.0, <0.103.12
>=0.104.0-alpha.1, <0.104.0-alpha.6
>=0.0.0-0, <0.103.12
0.103.12
0.104.0-alpha.6

Affected products

  • rustls webpki

Classification

Weakness
  • CWE-295 Improper Certificate Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.