CVE-2026-52680: Apache Kyuubi REST batch multipart upload handling uses the client-supplied multipart filename when creating a

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CRITICAL 9.8REMOTEWATCHLISTUPGRADE

CVE-2026-52680 is a critical-severity flaw (CVSS 9.8) affecting kyuubi. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Apache Kyuubi REST batch multipart upload handling uses the client-supplied multipart filename when creating a temporary uploaded resource. A remote attacker who can access the REST batch upload endpoint can provide path traversal sequences in the filename and cause the Kyuubi server process to write controlled content outside the intended upload directory, subject to filesystem permissions. This issue affects Apache Kyuubi: from 1.7.0 through

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	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 34%)
CISA exploited list	No
Weakness	CWE-22, CWE-73
Published	2026-07-30
Last modified	2026-10-23

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

Am I affected?

Timeline

2026-07-30 16:17 UTCPublished CVE record published
2026-10-23 22:10 UTCUpdated Record last modified

apache kyuubi UPGRADE

Affected: >= 1.7.0 and < 1.12.0

Fixed in: 1.12.0

Safe to downgrade to: a release before 1.7.0

1. Check installed version

apt-cache policy kyuubi || rpm -q kyuubi || kyuubi --version

2. UPGRADE to 1.12.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade kyuubi

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade kyuubi

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 1.7.0 (Debian / Ubuntu)

apt-cache madison kyuubi sudo apt install kyuubi=<VERSION_BEFORE_1.7.0> sudo apt-mark hold kyuubi

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list kyuubi sudo dnf downgrade kyuubi-<VERSION_BEFORE_1.7.0> sudo dnf versionlock add kyuubi

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 · pspp · FIXED · 2.1.3-2.fc46 · FEDORA-2026-0d6444911b · source

sudo dnf upgrade --advisory=FEDORA-2026-0d6444911b

Fedora ELN · barman · FIXED · 3.20.1-3.eln159 · FEDORA-2026-45ecf042c2 · source

sudo dnf upgrade --advisory=FEDORA-2026-45ecf042c2

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: 0xdak/CVE-2026-52680_exploit (0 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-2026-23904 HIGH 7.3 UPGRADE Kyuubi Engine UI proxy accepts a host and port from the request path and proxies HTTP requests to that destina
CVE-2026-62391 HIGH 8.1 UPGRADE The security fix for CVE-2025-66518 is incomplete. Any client who can access to Apache Kyuubi Server via Kyuub

References

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