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CVE-2026-7168: Successfully using libcurl to do a transfer over a specific HTTP proxy (`proxyA`) with **Digest** authenticati

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This week
MEDIUM 5.3REMOTEUPGRADE

CVE-2026-7168 is a medium-severity flaw (CVSS 5.3) affecting curl. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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`.

Why this priority

  • Public exploit reference
  • Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score5.3 (Medium)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.5% (top 59%)
CISA exploited listNo
WeaknessCWE-294
Published2026-05-13
Last modified2026-09-15
Publisher (CNA): curl · Vendor: haxx

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Last updated 2026-09-15 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

haxx curl UPGRADE
Affected: >= 7.12.0 and < 8.20.0
Fixed in: 8.20.0
Safe to downgrade to: a release before 7.12.0
1. Check installed version
apt-cache policy curl || rpm -q curl || curl --version
2. UPGRADE to 8.20.0 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade curl
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade curl
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 7.12.0 (Debian / Ubuntu)
apt-cache madison curl sudo apt install curl=<VERSION_BEFORE_7.12.0> sudo apt-mark hold curl
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list curl sudo dnf downgrade curl-<VERSION_BEFORE_7.12.0> sudo dnf versionlock add curl
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-7168?

curl: upgrade to 8.20.0. Exact commands for each OS are on this page.

Is CVE-2026-7168 being exploited?

CVE-2026-7168 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-7168 affect?

CVE-2026-7168 affects curl. Severity is medium (CVSS 5.3). 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 wrong

How urgent is CVE-2026-7168?

Priority 39/100. Public exploit reference; Remotely exploitable, no login, no user action

Software pages

curl vulnerabilities

Related CVEs

References

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