PatchTheCVECVE-2026-93682: When the HTTP stream wrapper follows a redirect and the response carries a Location header with an empty value
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MEDIUM 5.8REMOTEUPGRADE
CVE-2026-93682 is a medium-severity flaw (CVSS 5.8) affecting php. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
When the HTTP stream wrapper follows a redirect and the response carries a Location header with an empty value, the redirect code reads one byte past the end of the heap buffer holding the location. The value of that out-of-bounds byte decides which redirect target is built, so a malicious server controls whether the client is sent to the host root or to the current directory.
Why this priority
- Public exploit reference
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.8 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.4% (top 72%) |
| CISA exploited list | No |
| Weakness | CWE-125 |
| Published | 2026-09-25 |
| Last modified | 2026-10-23 |
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
php php UPGRADE
Affected: >= 8.2.0 and < 8.2.34 · >= 8.3.0 and < 8.3.35 · >= 8.4.0 and < 8.4.26 · >= 8.5.0 and < 8.5.11
Fixed in: 8.2.34, 8.3.35, 8.4.26, 8.5.11
Safe to downgrade to: a release before 8.2.0
1. Check installed version
apt-cache policy php || rpm -q php || php --version
2. UPGRADE to 8.2.34 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade php
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade php
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 8.2.0 (Debian / Ubuntu)
apt-cache madison php
sudo apt install php=<VERSION_BEFORE_8.2.0>
sudo apt-mark hold php
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list php
sudo dnf downgrade php-<VERSION_BEFORE_8.2.0>
sudo dnf versionlock add php
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.
Exact fixes by distribution
Fedora 46 · wasmedge · FIXED · 0.18.1-1.fc46 · FEDORA-2026-4c27216e39 · source
sudo dnf upgrade --advisory=FEDORA-2026-4c27216e39
Ubuntu 20.04 · php7.4 · FIXED · 7.4.3-4ubuntu2.29+esm4
sudo apt update && sudo apt install --only-upgrade php7.4
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' php7.4)" ge "7.4.3-4ubuntu2.29+esm4" && echo PATCHED || echo STILL-VULNERABLE
Ubuntu 22.04 · php8.1 · FIXED · 8.1.2-1ubuntu2.27
sudo apt update && sudo apt install --only-upgrade php8.1
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' php8.1)" ge "8.1.2-1ubuntu2.27" && echo PATCHED || echo STILL-VULNERABLE
Ubuntu 24.04 · php8.3 · FIXED · 8.3.6-0ubuntu0.24.04.12
sudo apt update && sudo apt install --only-upgrade php8.3
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' php8.3)" ge "8.3.6-0ubuntu0.24.04.12" && echo PATCHED || echo STILL-VULNERABLE
Debian 12 · php8.2 · FIXED · 8.2.34-1~deb12u1
sudo apt update && sudo apt install --only-upgrade php8.2
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' php8.2)" ge "8.2.34-1~deb12u1" && echo PATCHED || echo STILL-VULNERABLE
Debian 13 · php8.4 · FIXED · 8.4.26-1~deb13u1
sudo apt update && sudo apt install --only-upgrade php8.4
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' php8.4)" ge "8.4.26-1~deb13u1" && echo PATCHED || echo STILL-VULNERABLE
RHEL 10 · php · DEFERRED
RHEL 10 · php8.4 · DEFERRED
RHEL 6 · php · DEFERRED
RHEL 7 · php · DEFERRED
RHEL 8 · php:8.2/php · DEFERRED
Alpine 3.22 · php82 · FIXED · php82-8.2.35-r0
apk add --upgrade php82
apk info -v php82
Alpine 3.22 · php83 · FIXED · php83-8.3.36-r0
apk add --upgrade php83
apk info -v php83
Alpine 3.22 · php84 · FIXED · php84-8.4.27-r0
apk add --upgrade php84
apk info -v php84
Alpine 3.23 · php83 · FIXED · php83-8.3.36-r0
apk add --upgrade php83
apk info -v php83
sudo dnf update --advisory=ALAS2023-2026-3164
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.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
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