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Fencer Intel
medium 5.3

CVE-2026-3783 json

token leak with redirect and netrc

published 7mo ago modified last mo. also EUVD-2026-11138 , GHSA-8whr-249c-vfjp , JLSEC-2026-437

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 42%
public exploits
0
none known

Summary

When an OAuth2 bearer token is used for an HTTP(S) transfer, and that transfer performs a redirect to a second URL, curl could leak that token to the second hostname under some circumstances.

If the hostname that the first request is redirected to has information in the used .netrc file, with either of the `machine` or `default` keywords, curl would pass on the bearer token set for the first host also to the second one.

Patch / fix

  • julia CURL_jll 8.20.0+0
  • julia LibCURL_jll 8.19.0+0
  • curl curl 8.14.2, 8.16.1, 8.19.0
  • curl Debian 12 7.88.1-10+deb12u15
  • curl Debian 13 8.14.1-2+deb13u4
  • curl Debian 14 8.19.0-1

debian advisories DEBIAN-CVE-2026-3783

  • curl Ubuntu 22.04 LTS 7.81.0-1ubuntu1.23
  • curl Ubuntu 24.04 LTS 8.5.0-2ubuntu10.8
  • curl Ubuntu 25.10 8.14.1-2ubuntu1.2
  • curl Ubuntu 26.10, Ubuntu 26.04 LTS 8.18.0-1ubuntu2
  • curl Ubuntu Pro 20.04 LTS 7.68.0-1ubuntu2.25+esm3

ubuntu advisories UBUNTU-CVE-2026-3783

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 hummingbird 1 8.19.0-3.1.hum1
  • libcurl hummingbird 1 8.19.0-3.1.hum1
  • libcurl-minimal hummingbird 1 8.19.0-3.1.hum1
  • curl hummingbird 1 8.22.0-1.1.hum1
  • libcurl hummingbird 1 8.22.0-1.1.hum1
  • libcurl-minimal hummingbird 1 8.22.0-1.1.hum1
  • curl RHEL 10.2 8.12.1-4.el10_2.3
  • libcurl RHEL 10.2 8.12.1-4.el10_2.3

red hat advisories RHSA-2026:7432RHSA-2026:77255RHSA-2026:72506RHSA-2026:55450RHSA-2026:55439RHSA-2026:6893

  • curl SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 8.14.1-160000.5.1
  • curl-mini SLES for SAP applications 16.0, SLES 16.0 8.14.1-160000.5.1
  • curl SLES 15 SP5-LTSS, SLES 15 SP4-LTSS, SLE Micro 5.5 +8 more 8.14.1-150400.5.80.1
  • curl SLE Module for Basesystem 15 SP7 8.14.1-150700.7.14.1
  • curl SLES for SAP 15 SP6, SLES 15 SP6-LTSS, openSUSE Leap 15.6 8.14.1-150600.4.40.1
  • curl SLE Micro 5.2 8.14.1-150200.4.103.1
  • curl Linux Micro 6.1 8.14.1-slfo.1.1_6.1
  • curl Linux Micro 6.0 8.14.1-5.1

suse advisories SUSE-SU-2026:20760-1SUSE-SU-2026:20918-1SUSE-SU-2026:0921-1SUSE-SU-2026:0911-1SUSE-SU-2026:0903-1SUSE-SU-2026:0885-1

  • curl openSUSE Leap 16.0 8.14.1-160000.5.1
  • curl openSUSE Tumbleweed 8.19.0-1.1

opensuse advisories openSUSE-SU-2026:20404-1openSUSE-SU-2026:10371-1

  • curl AlmaLinux 9 7.76.1-40.el9_8.5
  • libcurl AlmaLinux 9 7.76.1-40.el9_8.5
  • curl-minimal AlmaLinux 9 7.76.1-40.el9_8.5
  • libcurl-minimal AlmaLinux 9 7.76.1-40.el9_8.5

almalinux advisories ALSA-2026:55439

  • curl Rocky Linux 9 7.76.1-40.el9_8.5

rocky linux advisories RLSA-2026:55439

  • curl Alpine 3.21 8.14.1-r3
  • curl Alpine 3.22 8.14.1-r4
  • curl Alpine 3.24, Alpine 3.23 8.19.0-r0

alpine advisories ALPINE-CVE-2026-3783

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 8.11.1-6

azure linux advisories AZL-79673

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

Is CVE-2026-3783 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

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-2026-3783 updated cvss 5.7

curl: curl: Information disclosure via OAuth2 bearer token leakage during HTTP(S) redirect

  • Red Hat Confidential Compute Attestation build-of-trustee/trustee-rhel9, openshift-sandboxed-containers/osc-rhel9-operator, openshift-sandboxed-containers/osc-operator-bundle, openshift-sandboxed-containers/osc-podvm-builder-rhel9, openshift-sandboxed-containers/osc-podvm-payload-rhel9, confidential-compute-attestation-tech-preview/trustee-rhel9 Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/vector-rhel9, openshift-logging/fluentd-rhel9, openshift-logging/eventrouter-rhel9, openshift-logging/logging-view-plugin-rhel9, openshift-logging/cluster-logging-rhel9-operator, openshift-logging/log-file-metric-exporter-rhel9, +1 more 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 snphost Red Hat Enterprise Linux 10 snphost Red Hat Enterprise Linux AI (RHEL AI) 3 rust
    affected: workaround, no fix available
  • Red Hat OpenShift Container Platform 4 openshift4/recert-rhel9, openshift/ose-rhel-coreos-8, 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 “Fix deferred”
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.17 cert-manager/cert-manager-operator-rhel9 1791788287, cert-manager/jetstack-cert-manager-rhel9 1791371069, cert-manager/cert-manager-istio-csr-rhel9 1791378395, cert-manager/cert-manager-operator-bundle 1791970484, cert-manager/jetstack-cert-manager-acmesolver-rhel9 1791371080
    fixed: vendor fix RHSA-2026:82336
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.18 cert-manager/cert-manager-operator-rhel9 1789029076, cert-manager/jetstack-cert-manager-rhel9 1791459711, cert-manager/cert-manager-istio-csr-rhel9 1791459759, cert-manager/cert-manager-operator-bundle 1791966259, cert-manager/jetstack-cert-manager-acmesolver-rhel9 1791459707
    fixed: vendor fix RHSA-2026:82354
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.19 cert-manager/cert-manager-operator-rhel9 1788348522, cert-manager/jetstack-cert-manager-rhel9 1788348571, cert-manager/cert-manager-istio-csr-rhel9 1788348594, cert-manager/jetstack-cert-manager-acmesolver-rhel9 1788348571
    fixed: vendor fix RHSA-2026:63140
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.20 cert-manager/cert-manager-operator-rhel9 1790272426, cert-manager/cert-manager-operator-rhel9 1790589855, cert-manager/jetstack-cert-manager-rhel9 1790223279, cert-manager/jetstack-cert-manager-rhel9 1790589912, cert-manager/cert-manager-istio-csr-rhel9 1790223719, cert-manager/cert-manager-istio-csr-rhel9 1790589914, +2 more
    fixed: vendor fix RHSA-2026:72475
  • Red Hat Discovery 2 discovery/discovery-ui-rhel9 1788206196, discovery/discovery-server-rhel9 1788205779
    fixed: vendor fix RHSA-2026:61783
show 14 more
  • Red Hat Enterprise Linux AppStream (v. 9) libcurl-devel 7.76.1-40.el9_8.5, curl-debuginfo 7.76.1-40.el9_8.5, curl-debugsource 7.76.1-40.el9_8.5, libcurl-debuginfo 7.76.1-40.el9_8.5, curl-minimal-debuginfo 7.76.1-40.el9_8.5, libcurl-minimal-debuginfo 7.76.1-40.el9_8.5
    fixed: vendor fix RHSA-2026:55439
  • Red Hat Enterprise Linux AppStream (v. 10) libcurl-devel 8.12.1-4.el10_2.3, curl-debuginfo 8.12.1-4.el10_2.3, curl-debugsource 8.12.1-4.el10_2.3, libcurl-debuginfo 8.12.1-4.el10_2.3, libcurl-minimal-debuginfo 8.12.1-4.el10_2.3
    fixed: vendor fix RHSA-2026:55450
  • 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. 9) curl 7.76.1-40.el9_8.5, libcurl 7.76.1-40.el9_8.5, curl-minimal 7.76.1-40.el9_8.5, libcurl-minimal 7.76.1-40.el9_8.5
    fixed: vendor fix RHSA-2026:55439
  • Red Hat Enterprise Linux BaseOS (v. 10) curl 8.12.1-4.el10_2.3, libcurl 8.12.1-4.el10_2.3, libcurl-minimal 8.12.1-4.el10_2.3
    fixed: vendor fix RHSA-2026:55450
  • 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 curl 8.19.0-3.hum1, curl 8.19.0-3.1.hum1, curl 8.22.0-1.1.hum1, libcurl 8.19.0-3.hum1, libcurl 8.19.0-3.1.hum1, libcurl 8.22.0-1.1.hum1, +3 more
    fixed: vendor fix RHSA-2026:7432
  • Red Hat JBoss Core Services 2.4.62.SP5
    fixed: vendor fix RHSA-2026:56869
  • Red Hat Update Infrastructure 5 rhui5/cds-rhel9 1788880464, rhui5/rhua-rhel9 1788880581, rhui5/haproxy-rhel9 1788880456, rhui5/rhua-tp-rhel9 1787241260, rhui5/installer-rhel9 1788765051, rhui5/installer-tp-rhel9 1787135742, +2 more
    fixed: vendor fix RHSA-2026:66018
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.20 cert-manager/jetstack-cert-manager-acmesolver-rhel9 1790223630
    not affected: vulnerable code not present
  • 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-llama-stack-k8s-operator-rhel9 Red Hat Update Infrastructure 5 rhui5/cds-tp-rhel9 1787241206
    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
7mo ago

Exploit prediction

0.50% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • hackerone.com https://hackerone.com/reports/3583983 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
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
<8.19.0+0
8.19.0+0

Affected products

  • curl curl

Classification

Weakness
  • CWE-522 Insufficiently Protected Credentials

References

Sources

Fencer Intel 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.