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Fencer Vulns
medium 5.3

CVE-2026-7168 json

cross-proxy Digest auth state leak

published 2026-05-13 5 mo ago modified 2026-09-15 55 d ago also EUVD-2026-29932 , GHSA-v92m-hrhj-gw54 , JLSEC-2026-1210

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 41%
public exploits
0
none known

Summary

Successfully using libcurl to do a transfer over a specific HTTP proxy (`proxyA`) with **Digest** authentication and then changing the proxy host to a second one (`proxyB`) for a second transfer, reusing the same handle, makes libcurl wrongly pass on the `Proxy-Authorization:` header field meant for `proxyA`, to `proxyB`.

Patch / fix

  • julia CURL_jll 8.20.0+0
  • julia LibCURL_jll 8.20.0+0
  • curl curl 8.14.2, 8.16.1, 8.20.0
  • curl Debian 12 7.88.1-10+deb12u15
  • curl Debian 13 8.14.1-2+deb13u4
  • curl Debian 14 8.20.0-1

debian advisories DEBIAN-CVE-2026-7168

  • curl Ubuntu 22.04 LTS 7.81.0-1ubuntu1.24
  • curl Ubuntu 24.04 LTS 8.5.0-2ubuntu10.9
  • curl Ubuntu 25.10 8.14.1-2ubuntu1.3
  • curl Ubuntu 26.04 LTS 8.18.0-1ubuntu2.1
  • curl Ubuntu Pro 18.04 LTS 7.58.0-2ubuntu3.24+esm10
  • curl Ubuntu Pro 20.04 LTS 7.68.0-1ubuntu2.25+esm5

ubuntu advisories UBUNTU-CVE-2026-7168

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_2.7
  • libcurl RHEL 10.2 8.12.1-4.el10_2.7
  • libcurl-minimal RHEL 10.2 8.12.1-4.el10_2.7
  • curl hummingbird 1 8.20.0-2.hum1
  • libcurl hummingbird 1 8.20.0-2.hum1
  • libcurl-minimal hummingbird 1 8.20.0-2.hum1

red hat advisories RHSA-2026:80512RHSA-2026:19106

  • curl SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 8.14.1-160000.9.1
  • curl-mini SLES for SAP applications 16.0, SLES 16.0 8.14.1-160000.9.1
  • curl SLE Micro 5.5, SLE Micro 5.4, SLE Micro 5.3 8.14.1-150400.5.91.1
  • curl Linux Micro 6.0 8.14.1-8.1
  • curl Linux Micro 6.1 8.14.1-slfo.1.1_9.1
  • curl SLE Module for Basesystem 15 SP7 8.14.1-150700.7.23.1
  • curl SLES for SAP 15 SP6, SLES 15 SP6-LTSS 8.14.1-150600.4.51.1
  • curl SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 8.0.1-11.126.1

suse advisories SUSE-SU-2026:4047-1SUSE-SU-2026:23498-1SUSE-SU-2026:23638-1SUSE-SU-2026:3958-1SUSE-SU-2026:23361-1SUSE-SU-2026:23350-1

  • curl openSUSE Leap 16.0 8.14.1-160000.9.1

opensuse advisories openSUSE-SU-2026:21774-1

  • curl AlmaLinux 10 8.12.1-4.el10_2.7
  • libcurl AlmaLinux 10 8.12.1-4.el10_2.7
  • libcurl-minimal AlmaLinux 10 8.12.1-4.el10_2.7

almalinux advisories ALSA-2026:80512

  • curl Rocky Linux 10 8.12.1-4.el10_2.7

rocky linux advisories RLSA-2026:80512

  • curl Alpine 3.21 8.14.1-r3
  • curl Alpine 3.22 8.14.1-r4
  • curl Alpine 3.24, Alpine 3.23 8.20.0-r0

alpine advisories ALPINE-CVE-2026-7168

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 8.11.1-7

azure linux advisories AZL-86669

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-2026-7168 updated cvss 5.3

curl: libcurl: Information disclosure via incorrect Proxy-Authorization header reuse

  • Red Hat Enterprise Linux 6 curl, libcurl Red Hat Enterprise Linux 7 curl, libcurl Red Hat Enterprise Linux 8 curl, libcurl, libcurl-minimal
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Enterprise Linux 9 curl, libcurl, curl-minimal, libcurl-minimal
    affected: workaround, no fix available
  • Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    affected: workaround, no fix available “Fix deferred”
  • 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 1792605272
    fixed: vendor fix RHSA-2026:87400
  • Red Hat Enterprise Linux AppStream (v. 10) libcurl-devel 8.12.1-4.el10_2.7, curl-debuginfo 8.12.1-4.el10_2.7, curl-debugsource 8.12.1-4.el10_2.7, libcurl-debuginfo 8.12.1-4.el10_2.7, libcurl-minimal-debuginfo 8.12.1-4.el10_2.7 Red Hat Enterprise Linux BaseOS (v. 10) curl 8.12.1-4.el10_2.7, libcurl 8.12.1-4.el10_2.7, libcurl-minimal 8.12.1-4.el10_2.7
    fixed: vendor fix RHSA-2026:80512
  • Red Hat Hardened Images curl 8.20.0-2.hum1, libcurl 8.20.0-2.hum1, libcurl-minimal 8.20.0-2.hum1
    fixed: vendor fix RHSA-2026:19106
  • Red Hat JBoss Core Services 2.4.62.SP5
    fixed: vendor fix RHSA-2026:56869
show 1 more
  • 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 SSVC

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

Exploit prediction

0.47% chance of exploitation in the next 30 days, higher than 41% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • hackerone.com https://hackerone.com/reports/3697719 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
OSV 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem package affected fixed in
julia CURL_jll
<8.20.0+0
8.20.0+0
julia LibCURL_jll
<8.20.0+0
8.20.0+0

Affected products

  • curl curl

Classification

Weakness
  • CWE-294 Authentication Bypass by Capture-replay

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.