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Public proof of conceptFix available

CVE-2026-7168

cross-proxy Digest auth state leak

A public proof of concept exists; no exploitation attested.

  • Published2026-05-13
  • Fixed in8.20.0
  • WeaknessCWE-294

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

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`.

Timeline

dates in UTC
  1. 2026-05-1313:01CVE 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-2026-7168?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-7168?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
8.20≥ 7.12.0, < 8.20.08.20.0

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_2.7and 3 other packages

Vendor advisories

  • CVE-2026-7168 Red Hat Product Security60 products fixed · 21 known affected

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

    curl as a component of Red Hat Enterprise Linux 6 · curl.src as a component of Red Hat Enterprise Linux 6 · libcurl as a component of Red Hat Enterprise Linux 6 · +18 more

  • RHSA-2026:87400 Red Hat Product Security1 product fixed

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

  • RHSA-2026:80512 Red Hat Product Security49 products fixed

    Red Hat Security Advisory: curl security update

  • 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

  • RHSA-2026:19106 Red Hat Product Security9 products fixed

    Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Full record on NVD

Fix

  1. Update Haxx curl to 8.20.0
  2. Vendor fix Red Hat Product Security RHSA-2026:87400 · 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-2026:80512 · 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 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
  5. Vendor fix Red Hat Product Security RHSA-2026:19106 · 9 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
  6. Workaround from the vendor Red Hat Product Security RHSA-2026:87400 · 1 productTo mitigate this issue, applications using libcurl should avoid reusing handles when switching between different HTTP proxies, especially after performing Digest authentication. This operational control prevents the unintended disclosure of `Proxy-Authorization` headers to subsequent proxy hosts.
  7. No fix available, says the vendor Red Hat Product Security CVE-2026-7168 · 15 productsFix deferred

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

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Published
2026-05-13
Last Modified
2026-09-15
NVD status
Modified
MSRC Title
cross-proxy Digest auth state leak

Frequently asked questions

What is CVE-2026-7168?

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`.

Is CVE-2026-7168 actively exploited?

A proof-of-concept exploit exists for CVE-2026-7168, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-7168?

CVE-2026-7168 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

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