CVE-2026-33267: Improper Input Validation vulnerability in Apache Traffic Server. This issue affects Apache Traffic Server: f

This week

CRITICAL 10.0REMOTEWATCHLISTUPGRADE

CVE-2026-33267 is a critical-severity flaw (CVSS 10.0) affecting traffic server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper Input Validation vulnerability in Apache Traffic Server. This issue affects Apache Traffic Server: from 9.2.0 through 9.2.14, from 10.1.0 through 10.1.3. Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fixes the issue.

Why this priority

Critical severity
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	10.0 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-20
Published	2026-07-29
Last modified	2026-10-23

Publisher (CNA): Apache Software Foundation · Vendor: apache

Am I affected?

Timeline

2026-07-29 08:16 UTCPublished CVE record published
2026-10-23 23:10 UTCUpdated Record last modified

apache traffic server UPGRADE

Affected: >= 9.2.0 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 9.2.0

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 9.2.0 (Debian / Ubuntu)

apt-cache madison traffic-server sudo apt install traffic-server=<VERSION_BEFORE_9.2.0> 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_9.2.0> 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

Public exploits and detection

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

GitHub PoC: Boreas37/CVE-2026-33267-PoC (4 stars)

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.

Related CVEs

CVE-2026-41920 CRITICAL 9.3 UPGRADE Improper Access Control vulnerability in Apache Traffic Server. This issue affects Apache Traffic Server: fro
CVE-2026-58153 HIGH 8.3 UPGRADE Apache Traffic Server forwards HTTP/2 origin trailers to HTTP/1 clients without proper chunked framing when co
CVE-2026-22068 HIGH 8.2 UPGRADE Regular Expression without Anchors vulnerability in Apache Traffic Server. This issue affects Apache Traffic
CVE-2026-58177 HIGH 8.1 UPGRADE The Apache Traffic Server Cripts framework has out-of-bounds writes, path traversal, and use-after-free errors
CVE-2026-24033 HIGH 7.2 UPGRADE Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in Apache Traff

References

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