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Fencer Vulns
high 7.5

CVE-2026-8932 json

incomplete mTLS config matching in conn reuse

published 2026-07-03 4 mo ago modified 2026-09-15 55 d ago also EUVD-2026-41509 , GHSA-m7xm-hf59-w6rj , JLSEC-2026-1217

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 34%
public exploits
0
none known

Summary

libcurl would reuse a previously created connection even when some mTLS config related option had been changed that should have prohibited reuse.

libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse if one of them matches the setup. However, some TLS settings related to client certificates were left out from the configuration match checks, making them match too easily. In particular options related to the private key.

Patch / fix

  • julia CURL_jll 8.21.0+0
  • julia LibCURL_jll 8.21.0+0
  • curl curl 8.14.2, 8.16.1, 8.20.1
  • curl Debian 14 8.21.0~rc2-1

debian advisories DEBIAN-CVE-2026-8932

  • curl Ubuntu 22.04 LTS 7.81.0-1ubuntu1.27
  • curl Ubuntu 24.04 LTS 8.5.0-2ubuntu10.13
  • curl Ubuntu 26.04 LTS 8.18.0-1ubuntu2.5
  • curl Ubuntu Pro 18.04 LTS 7.58.0-2ubuntu3.24+esm12
  • curl Ubuntu Pro 20.04 LTS 7.68.0-1ubuntu2.25+esm7

ubuntu advisories UBUNTU-CVE-2026-8932

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • curl RHEL 10.2 8.12.1-4.el10_2.6
  • libcurl RHEL 10.2 8.12.1-4.el10_2.6
  • libcurl-minimal RHEL 10.2 8.12.1-4.el10_2.6
  • curl hummingbird 1 8.21.0-0.1.hum1
  • libcurl hummingbird 1 8.21.0-0.1.hum1
  • libcurl-minimal hummingbird 1 8.21.0-0.1.hum1
  • rust hummingbird 1 1.96.1-1.hum1
  • cargo hummingbird 1 1.96.1-1.hum1

red hat advisories RHSA-2026:72506RHSA-2026:69125RHSA-2026:29017RHSA-2026:34975

  • curl SLE Module for Basesystem 15 SP7 8.22.0-150700.7.33.1
  • curl SLES 15 SP5-LTSS, SLES 15 SP4-LTSS, SLE Micro 5.5 +8 more 8.14.1-150400.5.98.1
  • curl SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 8.0.1-11.134.1
  • curl SLES for SAP 15 SP6, SLES 15 SP6-LTSS 8.22.0-150600.4.58.1

suse advisories SUSE-SU-2026:5071-1SUSE-SU-2026:5069-1SUSE-SU-2026:5068-1SUSE-SU-2026:4954-1

  • curl openSUSE Tumbleweed 8.21.0-1.1

opensuse advisories openSUSE-SU-2026:11230-1

  • curl AlmaLinux 8 7.61.1-34.el8_10.18
  • libcurl AlmaLinux 8 7.61.1-34.el8_10.18
  • libcurl-minimal AlmaLinux 8 7.61.1-34.el8_10.18
  • curl AlmaLinux 9 7.76.1-40.el9_8.9
  • libcurl AlmaLinux 9 7.76.1-40.el9_8.9
  • curl-minimal AlmaLinux 9 7.76.1-40.el9_8.9
  • libcurl-minimal AlmaLinux 9 7.76.1-40.el9_8.9
  • curl AlmaLinux 10 8.12.1-4.el10_2.6

almalinux advisories ALSA-2026:92368ALSA-2026:92907ALSA-2026:69125

  • curl Rocky Linux 9 7.76.1-40.el9_8.9
  • curl Rocky Linux 8 7.61.1-34.el8_10.18
  • curl Rocky Linux 10 8.12.1-4.el10_2.6

rocky linux advisories RLSA-2026:92907RLSA-2026:92368RLSA-2026:69125

  • curl Alpine 3.23 8.22.0-r0
  • curl Alpine 3.24 8.21.0-r0

alpine advisories ALPINE-CVE-2026-8932

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

  • curl Azure Linux 3.0 8.11.1-10
  • cmake Azure Linux 3.0 3.30.3-15

azure linux advisories AZL-91797AZL-91827

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-2026-8932 updated cvss 7.5

libcurl: libcurl: Security feature bypass due to improper mTLS connection reuse

  • Red Hat Confidential Compute Attestation build-of-trustee/trustee-rhel9, openshift-sandboxed-containers/osc-podvm-payload-rhel9 Red Hat Enterprise Linux 6 curl, libcurl Red Hat Enterprise Linux 7 curl, libcurl Red Hat Enterprise Linux 9 snphost Red Hat Enterprise Linux 10 igvm, snphost Red Hat Enterprise Linux AI (RHEL AI) 3 rust
    affected: workaround, no fix available
  • Red Hat JBoss Core Services libcurl.so
    affected: workaround, no fix planned “Will not fix”
  • Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8 Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9 Red Hat OpenShift Dev Spaces devspaces/code-rhel9 Red Hat Trusted Profile Analyzer rhtpa/rhtpa-trustification-service-rhel9
    affected: workaround, no fix available
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-core-bff-rhel9, rhoai/odh-dashboard-rhel9, rhoai/odh-mod-arch-maas-rhel9, rhoai/odh-mod-arch-automl-rhel9, rhoai/odh-mod-arch-gen-ai-rhel9, rhoai/odh-mod-arch-mlflow-rhel9, +6 more
    under investigation
  • Red Hat Cost Management On-Premise 1 costmanagement/costmanagement-ui-rhel10 1791460851
    fixed: vendor fix RHSA-2026:79357
  • Red Hat Discovery 2 discovery/discovery-ui-rhel9 1793733716, discovery/discovery-server-rhel9 1793734080
    fixed: vendor fix RHSA-2026:94802
  • Red Hat Enterprise Linux AppStream (v. 9) libcurl-devel 7.76.1-40.el9_8.9, curl-debuginfo 7.76.1-40.el9_8.9, curl-debugsource 7.76.1-40.el9_8.9, libcurl-debuginfo 7.76.1-40.el9_8.9, curl-minimal-debuginfo 7.76.1-40.el9_8.9, libcurl-minimal-debuginfo 7.76.1-40.el9_8.9
    fixed: vendor fix RHSA-2026:92907
  • Red Hat Enterprise Linux AppStream (v. 10) libcurl-devel 8.12.1-4.el10_2.6, curl-debuginfo 8.12.1-4.el10_2.6, curl-debugsource 8.12.1-4.el10_2.6, libcurl-debuginfo 8.12.1-4.el10_2.6, libcurl-minimal-debuginfo 8.12.1-4.el10_2.6
    fixed: vendor fix RHSA-2026:69125
show 12 more
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) libcurl-devel 8.12.1-1.el10_0.10, curl-debuginfo 8.12.1-1.el10_0.10, curl-debugsource 8.12.1-1.el10_0.10, libcurl-debuginfo 8.12.1-1.el10_0.10, libcurl-minimal-debuginfo 8.12.1-1.el10_0.10
    fixed: vendor fix RHSA-2026:72506
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) libcurl-devel 7.76.1-31.el9_6.4, curl-debuginfo 7.76.1-31.el9_6.4, curl-debugsource 7.76.1-31.el9_6.4, libcurl-debuginfo 7.76.1-31.el9_6.4, curl-minimal-debuginfo 7.76.1-31.el9_6.4, libcurl-minimal-debuginfo 7.76.1-31.el9_6.4
    fixed: vendor fix RHSA-2026:93454
  • Red Hat Enterprise Linux BaseOS (v. 8) curl 7.61.1-34.el8_10.18, libcurl 7.61.1-34.el8_10.18, libcurl-minimal 7.61.1-34.el8_10.18
    fixed: vendor fix RHSA-2026:92368
  • Red Hat Enterprise Linux BaseOS (v. 9) curl 7.76.1-40.el9_8.9, libcurl 7.76.1-40.el9_8.9, curl-minimal 7.76.1-40.el9_8.9, libcurl-minimal 7.76.1-40.el9_8.9
    fixed: vendor fix RHSA-2026:92907
  • Red Hat Enterprise Linux BaseOS (v. 10) curl 8.12.1-4.el10_2.6, libcurl 8.12.1-4.el10_2.6, libcurl-minimal 8.12.1-4.el10_2.6
    fixed: vendor fix RHSA-2026:69125
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) curl 8.12.1-1.el10_0.10, libcurl 8.12.1-1.el10_0.10, libcurl-minimal 8.12.1-1.el10_0.10
    fixed: vendor fix RHSA-2026:72506
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6) curl 7.76.1-31.el9_6.4, libcurl 7.76.1-31.el9_6.4, curl-minimal 7.76.1-31.el9_6.4, libcurl-minimal 7.76.1-31.el9_6.4
    fixed: vendor fix RHSA-2026:93454
  • Red Hat Hardened Images rust 1.96.1-1.hum1, cargo 1.96.1-1.hum1, clippy 1.96.1-1.hum1, curl 8.21.0-0.1.hum1, rustfmt 1.96.1-1.hum1, rust-gdb 1.96.1-1.hum1, +14 more
    fixed: vendor fix RHSA-2026:34975
  • Red Hat JBoss Core Services 2.4.62.SP5
    fixed: vendor fix RHSA-2026:56869
  • Red Hat OpenShift Container Platform 4.22 rhcos 4.22.9.8.202611032353
    fixed: vendor fix RHSA-2026:95346
  • Red Hat Enterprise Linux 8 dotnet, dotnet8.0, dotnet-host, dotnet-sdk-8.0, dotnet-hostfxr-8.0, dotnet-runtime-8.0, +10 more Red Hat Enterprise Linux 9 rust, cargo, clippy, rustfmt, rust-gdb, rust-src, +9 more Red Hat Enterprise Linux 10 rust, trustee, s390utils, trustee-guest-components
    not affected: component not present
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-mlflow-rhel9, rhoai/odh-kube-rbac-proxy-rhel9, rhoai/odh-maas-controller-rhel9, rhoai/odh-mlflow-operator-rhel9, rhoai/odh-model-controller-rhel9, rhoai/odh-ogx-k8s-operator-rhel9, +14 more
    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 ICSA-26-293-05 updated cvss 7.5

Hitachi Energy RTU500 Product

  • Hitachi Energy RTU500 series CMU Firmware vers:RTU500_series_CMU_Firmware/>=13.5.1, <=13.5.4, vers:RTU500_series_CMU_Firmware/>=13.6.1, <=13.6.3, vers:RTU500_series_CMU_Firmware/>=13.7.1, <=13.7.8, vers:RTU500_series_CMU_Firmware/>=13.8.1, <=13.8.2
    affected: vendor fix, mitigation

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • hackerone.com https://hackerone.com/reports/3733910 referenced PoC, tagged "exploit" by a source, unverified

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:H/A:N
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
julia CURL_jll
<8.21.0+0
8.21.0+0
julia LibCURL_jll
<8.21.0+0
8.21.0+0

Affected products

  • curl curl

Classification

Weakness
  • CWE-305 Authentication Bypass by Primary Weakness

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.