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CVE-2025-9086: 1

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This week
HIGH 7.5REMOTEWATCHLISTUPGRADEMITIGATE

CVE-2025-9086 is a high-severity flaw (CVSS 7.5) affecting curl, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

1. A cookie is set using the `secure` keyword for `https://target` 2. curl is redirected to or otherwise made to speak with `http://target` (same hostname, but using clear text HTTP) using the same cookie set 3. The same cookie name is set - but with only a slash as path (`path="/"`). Since this site is not secure, the cookie *should* be ignored. 4. A bug in the path comparison logic makes curl read outside a heap buffer boundary The bu

Why this priority

  • High severity
  • Public exploit reference
  • Remotely exploitable, no login, no user action
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score7.5 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance1.5% (top 26%)
CISA exploited listNo
WeaknessCWE-125
Published2025-09-12
Last modified2026-10-19
Publisher (CNA): curl · Vendor: debian · haxx

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Last updated 2026-10-19 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

haxx curl UPGRADE
Affected: >= 8.13.0 and < 8.16.0
Fixed in: 8.16.0
Safe to downgrade to: a release before 8.13.0
1. Check installed version
apt-cache policy curl || rpm -q curl || curl --version
2. UPGRADE to 8.16.0 (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 8.13.0 (Debian / Ubuntu)
apt-cache madison curl sudo apt install curl=<VERSION_BEFORE_8.13.0> 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_8.13.0> 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.
debian debian linux MITIGATE
Affected: 11.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 11.0
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.
Fedora 46 · pipx · FIXED · 1.18.9-1.fc46 · FEDORA-2026-95305954ab · source
sudo dnf upgrade --advisory=FEDORA-2026-95305954ab
Fedora ELN · libisds · FIXED · 0.11.2-19.eln159 · FEDORA-2026-bf61b68668 · source
sudo dnf upgrade --advisory=FEDORA-2026-bf61b68668
Debian 12 · curl · NOT AFFECTED
Debian 13 · curl · FIXED · 8.14.1-2+deb13u1
sudo apt update && sudo apt install --only-upgrade curl dpkg --compare-versions "$(dpkg-query -W -f='${Version}' curl)" ge "8.14.1-2+deb13u1" && echo PATCHED || echo STILL-VULNERABLE
RHEL 10 · curl · FIXED · curl-8.12.1-2.el10_1.2
sudo dnf upgrade --advisory=RHSA-2026:1825 rpm -q curl
RHEL 10.0 Extended Update Support · curl · FIXED · curl-8.12.1-1.el10_0.4
sudo dnf upgrade --advisory=RHSA-2026:1477 rpm -q curl
RHEL 8 · curl · FIXED · curl-7.61.1-34.el8_10.9
sudo dnf upgrade --advisory=RHSA-2025:23383 rpm -q curl
RHEL 9 · curl · FIXED · curl-7.76.1-35.el9_7.3
sudo dnf upgrade --advisory=RHSA-2026:1350 rpm -q curl
RHEL 9.0 Update Services for SAP Solutions · curl · FIXED · curl-7.76.1-14.el9_0.12
sudo dnf upgrade --advisory=RHSA-2025:23126 rpm -q curl
Alpine 3.20 · curl · FIXED · curl-8.14.1-r2
apk add --upgrade curl apk info -v curl
Alpine 3.21 · curl · FIXED · curl-8.14.1-r2
apk add --upgrade curl apk info -v curl
Alpine 3.22 · curl · FIXED · curl-8.14.1-r2
apk add --upgrade curl apk info -v curl
Alpine 3.23 · curl · FIXED · curl-8.16.0-r0
apk add --upgrade curl apk info -v curl
Amazon Linux 2023 · see advisory · FIXED · ALAS2023-2025-1351 · source
sudo dnf update --advisory=ALAS2023-2025-1351
Amazon Linux 2 · see advisory · FIXED · ALAS2-2025-3056 · source
sudo yum update --advisory=ALAS2-2025-3056

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

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-2025-9086?

curl: upgrade to 8.16.0; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-9086 being exploited?

CVE-2025-9086 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-2025-9086 affect?

CVE-2025-9086 affects curl, debian linux. Severity is high (CVSS 7.5). 1. A cookie is set using the `secure` keyword for `https://target` 2. curl is redirected to or otherwise made to speak with `http://target` (same hostname, but using clear text HTTP) using the same cookie set 3. The same cookie name is s

How urgent is CVE-2025-9086?

Priority 60/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Debian vulnerabilities · curl vulnerabilities

Related CVEs

References

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