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Fencer Vulns
high 7.5

CVE-2026-97031 json

Reject malformed ECH outer extension references in crypto/tls

published 2026-10-08 31 d ago modified 2026-10-16 23 d ago also BIT-golang-2026-97031 , EUVD-2026-95422 , GO-2026-6607

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 54%
public exploits
0
none known

Summary

Multiple ECH outer extension references are not permitted under RFC 9849; previously, a client could send a well-crafted packet that could trigger memory exhaustion in the server process by specifying multiple references. We now reject these as malformed and curb the memory amplification vector as a result.

Patch / fix

  • bitnami golang 1.26.9, 1.27.2
  • go stdlib 1.26.9, 1.27.2
  • Go standard library crypto/tls 1.26.9, 1.27.2
  • golang-1.26 Debian 14 1.26.9-1
  • golang-1.27 Debian 14 1.27.2-1

debian advisories DEBIAN-CVE-2026-97031

  • go1.26-openssl SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 1.26.10-150000.1.21.2
  • go1.26-openssl SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Development Tools 15 SP7 1.26.10-150600.13.18.1
  • go1.26 SLES for SAP applications 16.0, SLES 16.0 1.26.9-160000.1.1
  • go1.27 SLES for SAP applications 16.0, SLES 16.0 1.27.2-160000.1.1
  • go1.26 SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 1.26.9-150000.1.33.1
  • go1.27 SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 1.27.2-150000.1.12.1

suse advisories SUSE-SU-2026:4867-1SUSE-SU-2026:4866-1SUSE-SU-2026:24239-1SUSE-SU-2026:24237-1SUSE-SU-2026:4629-1SUSE-SU-2026:4625-1

  • tempo-cli openSUSE Tumbleweed 3.1.1-1.1
  • mihomo openSUSE Tumbleweed 1.19.33-1.1
  • kyverno openSUSE Tumbleweed 1.19.2-1.1
  • go1.26 openSUSE Leap 16.0 1.26.9-160000.1.1
  • go1.27 openSUSE Leap 16.0 1.27.2-160000.1.1
  • rclone openSUSE Tumbleweed 1.75.2-1.1
  • go1.27 openSUSE Tumbleweed 1.27.2-1.1
  • go1.26 openSUSE Tumbleweed 1.26.9-1.1

opensuse advisories openSUSE-SU-2026:12351-1openSUSE-SU-2026:12246-1openSUSE-SU-2026:12214-1openSUSE-SU-2026:22095-1openSUSE-SU-2026:22093-1openSUSE-SU-2026:12112-1

  • delve AlmaLinux 9 1.26.1-2.el9_8
  • delve AlmaLinux 10 1.26.1-3.el10_2
  • opentelemetry-collector AlmaLinux 10 0.158.0-2.el10_2
  • opentelemetry-collector AlmaLinux 9 0.158.0-2.el9_8
  • grafana AlmaLinux 9 10.2.6-23.el9_8.7
  • grafana-selinux AlmaLinux 9 10.2.6-23.el9_8.7
  • grafana AlmaLinux 8 9.2.10-36.el8_10
  • grafana-selinux AlmaLinux 8 9.2.10-36.el8_10

almalinux advisories ALSA-2026:95518ALSA-2026:95519ALSA-2026:93596ALSA-2026:93617ALSA-2026:89744ALSA-2026:88188

  • delve Rocky Linux 10 1.26.1-3.el10_2
  • delve Rocky Linux 9 1.26.1-2.el9_8
  • opentelemetry-collector Rocky Linux 10 0.158.0-2.el10_2
  • opentelemetry-collector Rocky Linux 9 0.158.0-2.el9_8
  • grafana Rocky Linux 9 10.2.6-23.el9_8.7
  • golang-github-openprinting-ipp-usb Rocky Linux 10 0.9.27-7.el10_2.4
  • grafana-pcp Rocky Linux 10 5.3.0-8.el10_2.2
  • grafana-pcp Rocky Linux 9 5.1.1-17.el9_8.2

rocky linux advisories RLSA-2026:95519RLSA-2026:95518RLSA-2026:93596RLSA-2026:93617RLSA-2026:89744RLSA-2026:88280

  • go Alpine 3.24 1.26.9-r0

alpine advisories ALPINE-CVE-2026-97031

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2026-97031 updated cvss 7.5

crypto/tls: golang: crypto/tls: Denial of Service via multiple ECH outer extension references

  • Red Hat Exploit Intelligence exploit-intelligence/exploit-intelligence-operator-controller-rhel9 Red Hat OpenShift Developer Tools and Services helm 3.22.0-90.el9
    affected: workaround, no fix available
  • Red Hat OpenShift Pipelines openshift-pipelines-client 1.15.3-11580.el8
    affected: workaround, no fix planned “Will not fix”
  • Red Hat OpenShift Serverless kn-workflow-plugin 1.38.1-1.el9, openshift-serverless-clients 1.17.0-4.el9 Red Hat OpenShift Service Mesh 3 openshift-golang-builder-container Red Hat Ceph Storage 7 thrift Red Hat Ceph Storage 8 thrift, thrift-qt, perl-thrift, thrift-glib, python3-thrift Red Hat Ceph Storage 9 thrift, libarrow, parquet-libs Red Hat Certification Program for Red Hat Enterprise Linux 9 redhat-certification-cnf 9.0-20240522.1.el9, redhat-certification-preflight 9.42-20261005.el10
    +14 more products
    Red Hat Edge Manager 1 flightctl 1.3.1-1.el10 Red Hat Enterprise Linux 7 rhc, host-metering, rhc-worker-script, host-metering-selinux Red Hat Enterprise Linux 8 git-lfs, osbuild-composer, osbuild-composer-core, osbuild-composer-worker, git-lfs 3.7.1-5.el10_2.7, osbuild-composer-dnf-json, +1 more Red Hat Enterprise Linux 9 podman, skopeo, buildah, git-lfs, podman-tests, skopeo-tests, +24 more Red Hat Enterprise Linux 10 podman 5.8.2-9.el10_2, oci-delta 0.3.0-1.el10, skopeo 1.22.2-5.el10_2, buildah 1.43.1-6.el10_2, git-lfs 3.7.1-5.el10_2.7, image-builder 52.1-2.el10_2, +6 more Red Hat Enterprise Linux AI (RHEL AI) 3 golang 1.25.1-1.el9 Red Hat OpenShift AI (RHOAI) rhoai, rhoai/odh-trainer-rhel9, rhoai/odh-core-bff-rhel9, rhoai/odh-eval-hub-rhel9, rhoai/odh-maas-api-rhel9, rhoai/odh-rhel9-operator, +65 more Red Hat OpenShift Container Platform 4 cri-o, butane, ignition, cri-tools, openshift, microshift, +34 more Red Hat OpenShift Container Platform 5 cri-o, cri-tools, openshift, microshift, openshift-clients, ose-crio-credential-provider, +3 more Red Hat OpenShift on AWS rosa 1.2.64-b2f7c89.el8 Red Hat OpenShift Virtualization 4 openshift-golang-builder-container Red Hat Service Interconnect 1 skupper-cli 1.8.8-1.el9 Red Hat Service Interconnect 2 skupper-cli 1.8.8-1.el9 Red Hat streams for Apache Kafka 3 golang-github-danielqsj-kafka_exporter 1.9.0-12.el9
    affected: workaround, no fix available
  • Red Hat Ansible Automation Platform 2.6 for RHEL 9 receptor 1.6.9-3.el9ap Red Hat Ansible Automation Platform 2.6 for RHEL 10 receptor 1.6.9-3.el10ap
    fixed: vendor fix RHSA-2026:92621
  • Red Hat Ansible Automation Platform 2.7 for RHEL 9 receptor 1.6.9-3.el9ap Red Hat Ansible Automation Platform 2.7 for RHEL 10 receptor 1.6.9-3.el10ap
    fixed: vendor fix RHSA-2026:92622
  • Red Hat CodeReady Linux Builder EUS (v.9.6) rhc-devel 0.2.7-1.el9_6.8, rhc-debuginfo 0.2.7-1.el9_6.8, rhc-debugsource 0.2.7-1.el9_6.8
    fixed: vendor fix RHSA-2026:89914
  • Red Hat Enterprise Linux AppStream (v. 8) rhc 0.2.5-13.el8_10, grafana 9.2.10-36.el8_10, grafana-pcp 5.1.1-19.el8_10, grafana-selinux 9.2.10-36.el8_10, delve 1.26.1-1.module+el8.10.0+24516+40554724, golang 1.26.10-1.module+el8.10.0+25107+6b50279c, +6 more
    fixed: vendor fix RHSA-2026:86203
  • Red Hat Enterprise Linux AppStream (v. 9) rhc 0.2.7-16.el9_8, delve 1.26.1-2.el9_8, golang 1.26.10-1.el9_8, grafana 10.2.6-23.el9_8.7, go-toolset 1.26.10-1.el9_8, golang-bin 1.26.10-1.el9_8, +7 more
    fixed: vendor fix RHSA-2026:95518
show 10 more
  • Red Hat Enterprise Linux AppStream (v. 10) rhc 0.3.8-8.el10_2, delve 1.26.1-3.el10_2, golang 1.26.10-1.el10_2, ipp-usb 0.9.27-7.el10_2.4, grafana 10.2.6-28.el10_2.8, go-toolset 1.26.10-1.el10_2, +8 more
    fixed: vendor fix RHSA-2026:95519
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) rhc 0.2.0-6.el8_4.2, git-lfs 2.13.3-3.el8_4.6, osbuild-composer 28.7-7.el8_4, osbuild-composer-core 28.7-7.el8_4, osbuild-composer-worker 28.7-7.el8_4, delve 1.26.1-1.module+el8.4.0+25181+7ce5b91c, +7 more
    fixed: vendor fix RHSA-2026:90994
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) rhc 0.2.1-14.el8_6.1, grafana 7.5.11-12.el8_6, grafana-pcp 3.2.0-4.el8_6.2, delve 1.26.1-1.module+el8.6.0+24782+a062e766, golang 1.26.10-4.module+el8.6.0+25114+90ecdb41, go-toolset 1.26.10-4.module+el8.6.0+25114+90ecdb41, +5 more
    fixed: vendor fix RHSA-2026:87246
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) rhc 0.2.2-1.el8_8.3, grafana 7.5.15-12.el8_8, grafana-pcp 3.2.0-6.el8_8.2, delve 1.26.1-1.module+el8.8.0+24781+86ad105d, golang 1.26.10-4.module+el8.8.0+25113+a148ecc0, go-toolset 1.26.10-4.module+el8.8.0+25113+a148ecc0, +5 more
    fixed: vendor fix RHSA-2026:87245
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) rhc 0.2.2-1.el9_2.7, delve 1.26.1-1.el9_2.2, golang 1.26.10-1.el9_2, grafana 9.0.9-14.el9_2, go-toolset 1.26.10-1.el9_2, golang-bin 1.26.10-1.el9_2, +9 more
    fixed: vendor fix RHSA-2026:89888
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) rhc 0.2.4-9.el9_4.3, delve 1.26.1-1.el9_4.2, golang 1.26.10-1.el9_4, grafana 9.2.10-29.el9_4, go-toolset 1.26.10-1.el9_4, golang-bin 1.26.10-1.el9_4, +10 more
    fixed: vendor fix RHSA-2026:89885
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) rhc 0.3.2-6.el10_0.2, delve 1.26.1-3.el10_0, golang 1.26.10-1.el10_0, grafana 10.2.6-27.el10_0, go-toolset 1.26.10-1.el10_0, golang-bin 1.26.10-1.el10_0, +10 more
    fixed: vendor fix RHSA-2026:89884
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) rhc 0.2.7-1.el9_6.8, delve 1.26.1-1.el9_6.2, golang 1.26.10-1.el9_6, grafana 10.2.6-24.el9_6, go-toolset 1.26.10-1.el9_6, golang-bin 1.26.10-1.el9_6, +10 more
    fixed: vendor fix RHSA-2026:89933
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) rhc 0.2.0-6.el8_4.2, git-lfs 2.13.3-3.el8_4.6, osbuild-composer 28.7-7.el8_4, osbuild-composer-core 28.7-7.el8_4, osbuild-composer-worker 28.7-7.el8_4, delve 1.26.1-1.module+el8.4.0+25181+7ce5b91c, +7 more
    fixed: vendor fix RHSA-2026:90994
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) rhc 0.2.1-14.el8_6.1, grafana 7.5.11-12.el8_6, grafana-pcp 3.2.0-4.el8_6.2, delve 1.26.1-1.module+el8.6.0+24782+a062e766, golang 1.26.10-4.module+el8.6.0+25114+90ecdb41, go-toolset 1.26.10-4.module+el8.6.0+25114+90ecdb41, +5 more
    fixed: vendor fix RHSA-2026:87246

16 more fixed, 30 more not affected in the full advisory

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
yes
Technical impact
partial
Assessed
30 d ago

Exploit prediction

0.72% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
bitnami golang
<1.26.9
>=1.27.0-0, <1.27.2
1.26.9
1.27.2
go stdlib
<1.26.9
>=1.27.0-0, <1.27.2
1.26.9
1.27.2

Affected products

  • Go standard library crypto/tls

Classification

Weakness
  • CWE-405 Asymmetric Resource Consumption (Amplification)

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.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.