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Fencer Vulns
medium 4.4

CVE-2026-93602 json

rustls-webpki before 0.103.10 CRL Revocation Check Bypass

published 2026-03-20 7 mo ago modified 2026-09-22 47 d ago also GHSA-pwjx-qhcg-rvj4 , RUSTSEC-2026-0049 , EUVD-2026-82897

cvss
4.4
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 9%
public exploits
0
none known

Summary

rustls-webpki versions before 0.103.10 and 0.104.0-alpha.5 contain faulty CRL authority-matching logic that compares only the first distributionPoint against each CRL's IssuingDistributionPoint, ignoring additional distributionPoints. Attackers with a compromised trusted issuing authority can present revoked certificates that pass revocation checks under UnknownStatusPolicy::Allow, or cause incorrect errors under the default deny policy.

Patch / fix

  • crates.io rustls-webpki 0.103.10, 0.104.0-alpha.5
  • rustls webpki 0.103.10, 0.104.0-alpha.5
  • rust-rustls-webpki Debian 14 0.103.10+ds-1

debian advisories DEBIAN-CVE-2026-93602

  • 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

  • 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-2026:22175-1openSUSE-SU-2026:22189-1openSUSE-RU-2026:22132-1openSUSE-SU-2026:22016-1openSUSE-SU-2026:21982-1openSUSE-SU-2026:11936-1

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

azure linux advisories AZL-103463

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-2026-93602 updated cvss 4.4

rustls-webpki: rustls-webpki: Certificate Revocation Check Bypass via Faulty CRL Logic

  • Red Hat Ansible Automation Orchestrator 2026 ansible-automation-platform/automation-orchestrator-backend-rhel9 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, agent-sandbox/agent-sandbox-router, openshift-sandboxed-containers/osc-podvm-builder-rhel9, openshift-sandboxed-containers/osc-podvm-payload-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 Red Hat OpenShift Service Mesh 3 openshift-service-mesh/istio-ztunnel-rhel9 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-26/mcp-tools-rhel9, ansible-automation-platform-27/mcp-tools-rhel9, +24 more Red Hat Ansible Automation Platform Ansible Core 2 ansible-automation-platform/ee-minimal-rhel8, ansible-automation-platform/ee-minimal-rhel9, ansible-automation-platform-tech-preview/ee-minimal-rhel8, ansible-automation-platform-tech-preview/ee-minimal-rhel9
    affected: no fix available, no fix planned “Out of support scope”
  • Red Hat Discovery 2 discovery/discovery-server-rhel9 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, +73 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, trustee 0.15.0-2.el10, samba 4.23.5-110.el10_2, firefox 140.16.0-1.el10_2, +8 more Red Hat Enterprise Linux AI (RHEL AI) 3 rust 1.98.1-1.el10
    +5 more products
    Red Hat Enterprise Linux command line assistant rhel-cla/rhel-knowledge-bridge-rhel10 Red Hat OpenShift AI (RHOAI) rhoai/odh-feature-server-rhel9, rhai/base-image-torch-2.14-cpu-rhel9, rhoai/odh-llm-d-inference-scheduler-rhel9, rhai/base-image-torch-2.14-cuda-13.0-rhel9, rhoai/odh-fms-guardrails-orchestrator-rhel9, rhoai/odh-ml-pipelines-runtime-generic-rhel9, +2 more Red Hat OpenShift Container Platform 4 conmon-rs, kata-containers, coreos-installer, coreos-installer-dracut, coreos-installer-bootinfra Red Hat OpenShift Container Platform 5 conmon-rs, kata-containers Red Hat OpenShift Update Service openshift-update-service/openshift-update-service-rhel8
    affected: no fix available “Fix deferred”
  • Red Hat Quay 3 quay/quay-rhel8, quay/quay-rhel9, redhat-user-workloads/quay-eng-tenant/quay-quay-v3-9
    affected: no fix available, no fix planned “Out of support scope”
  • Red Hat Satellite 6 satellite/iop-vmaas-rhel9, python-maturin 1.8.2-1.el9pc, python3.12-maturin 1.7.1-2.el9sat, satellite/iop-advisor-engine-rhel9, satellite/iop-host-inventory-rhel9, satellite/iop-advisor-backend-rhel9, +1 more 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 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
    not affected: component 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
51 d ago

Exploit prediction

0.20% chance of exploitation in the next 30 days, higher than 9% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 5.9 CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
CNA 3.1 4.4 CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N
CNA 4.0 5.9 CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:H/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 4.4 CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
crates.io rustls-webpki
>=0.102.0-alpha.0, <0.103.10
>=0.104.0-alpha.1, <0.104.0-alpha.5
0.103.10
0.104.0-alpha.5

Affected products

  • rustls webpki

Classification

Weakness
  • CWE-299 Improper Check for Certificate Revocation

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.