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Public proof of conceptFix available

CVE-2026-9079

A public proof of concept exists; no exploitation attested.

  • Published2026-07-03
  • Fixed in8.21.0
  • WeaknessCWE-522

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

libcurl had a flaw that when instructed to clear proxy authentication credentials which made it not do so, leaving the old credentials around to get used for subsequent transfers that should not know nor use them.

Timeline

dates in UTC
  1. 2026-07-0307:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-9079?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-9079?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Haxx curl
BranchAffectedFixed in
8.x≥ 8.8.0, < 8.21.08.21.0

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • libcurlAlmaLinux:10all versions · fixed in 8.12.1-4.el10_2.6and 3 other packages

Vendor advisories

  • CVE-2026-9079 Red Hat Product Security148 products fixed · 6 known affected

    libcurl: libcurl: Information disclosure due to failure to clear proxy authentication credentials

    build-of-trustee/trustee-rhel9 as a component of Confidential Compute Attestation · openshift-sandboxed-containers/osc-podvm-payload-rhel9 as a component of Confidential Compute Attestation · rust.src as a component of Red Hat Enterprise Linux AI (RHEL AI) 3 · +3 more

  • RHSA-2026:79357 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Cost Management On-Premise container image update

  • RHSA-2026:72506 Red Hat Product Security49 products fixed

    Red Hat Security Advisory: curl security update

  • RHSA-2026:69125 Red Hat Product Security49 products fixed

    Red Hat Security Advisory: curl security update

  • ICSA-26-293-05 CISA4 known affected

    Hitachi Energy RTU500 Product

    RTU500 series CMU Firmware version 13.5.1 – 13.5.4 · RTU500 series CMU Firmware version 13.6.1 – 13.6.3 · RTU500 series CMU Firmware version 13.7.1 – 13.7.8 · +1 more

  • RHSA-2026:56869 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.62 SP5 security update

2 more advisories

Full record on NVD

Fix

  1. Update Haxx curl to 8.21.0
  2. Vendor fix Red Hat Product Security RHSA-2026:79357 · 1 productThe container image provided by this update can be downloaded from the Red Hat container registry at registry.redhat.io using the "podman pull" command.
  3. Vendor fix Red Hat Product Security RHSA-2026:72506 · 49 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
  4. Vendor fix CISA ICSA-26-293-05 · 2 productsUpdate to CMU Firmware version 13.9.1
  5. Vendor fix CISA ICSA-26-293-05 · 1 productUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available)
  6. Vendor fix CISA ICSA-26-293-05 · 1 productUpdate to CMU Firmware version 13.9.1 or 13.8.3*
  7. Vendor fix Red Hat Product Security RHSA-2026:56869 · 1 productBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • CISA-ADPSSVC decisionpoc2026-07-06
  • OpenCVESSVC decisionpoc—
  • CISA-ADPCVSS 3.19.82026-07-06
  • CNAweakness (CWE)CWE-522read 2026-10-23
  • NVDweakness (CWE)CWE-522read 2026-10-23
  • FIRST EPSSEPSS score0.6 %2026-10-23
  • OSVaffected packages—

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2026-07-03
Last Modified
2026-09-15
NVD status
Modified

Frequently asked questions

What is CVE-2026-9079?

libcurl had a flaw that when instructed to clear proxy authentication credentials which made it not do so, leaving the old credentials around to get used for subsequent transfers that should not know nor use them.

Is CVE-2026-9079 actively exploited?

A proof-of-concept exploit exists for CVE-2026-9079, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-9079?

CVE-2026-9079 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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