PatchTheCVECVE-2026-41920: Improper Access Control vulnerability in Apache Traffic Server. This issue affects Apache Traffic Server: fro
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CRITICAL 9.3REMOTEWATCHLISTUPGRADE
CVE-2026-41920 is a critical-severity flaw (CVSS 9.3) affecting traffic server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Improper Access Control vulnerability in Apache Traffic Server. This issue affects Apache Traffic Server: from 9.0.0 through 9.1.14, from 10.0.0 through 10.1.3. Users are recommended to upgrade to version 9.1.15 or 10.1.4, which fixes the issue.
Why this priority
- Critical severity
- Remotely exploitable, no login, no user action
- On your watchlist
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.3 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.5% (top 56%) |
| CISA exploited list | No |
| Weakness | CWE-284 |
| Published | 2026-07-29 |
| Last modified | 2026-10-23 |
Publisher (CNA): Apache Software Foundation · Vendor: apache
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
apache traffic server UPGRADE
Affected: >= 9.0.0 and < 9.2.15 · >= 10.0.0 and < 10.1.4
Fixed in: 9.2.15, 10.1.4
Safe to downgrade to: a release before 9.0.0
1. Check installed version
apt-cache policy traffic-server || rpm -q traffic-server || traffic-server --version
2. UPGRADE to 9.2.15 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade traffic-server
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade traffic-server
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 9.0.0 (Debian / Ubuntu)
apt-cache madison traffic-server
sudo apt install traffic-server=<VERSION_BEFORE_9.0.0>
sudo apt-mark hold traffic-server
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list traffic-server
sudo dnf downgrade traffic-server-<VERSION_BEFORE_9.0.0>
sudo dnf versionlock add traffic-server
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 · python-openslide · FIXED · 1.4.7-1.fc46 · FEDORA-2026-336bea884e · source
sudo dnf upgrade --advisory=FEDORA-2026-336bea884e
Fedora ELN · valgrind · FIXED · 3.28.0-1.eln159 · FEDORA-2026-c593ef1d15 · source
sudo dnf upgrade --advisory=FEDORA-2026-c593ef1d15
Debian 12 · trafficserver · NO FIX YET
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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