CVE-2026-56207: Signature of Bearer token is not verified in last step of SAML2 authentication for Impala's hs2-http interface

This month

CRITICAL 9.8REMOTEWATCHLISTUPGRADE

CVE-2026-56207 is a critical-severity flaw (CVSS 9.8) affecting impala. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Signature of Bearer token is not verified in last step of SAML2 authentication for Impala's hs2-http interface, allowing altering user name and acting as another user. This issue affects Apache Impala: >=4.0.0. Users are recommended to upgrade to version 4.5.2, which fixes this 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	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 60%)
CISA exploited list	No
Weakness	CWE-347
Published	2026-09-09
Last modified	2026-09-10

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

Last updated 2026-09-10 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-09 11:17 UTCPublished CVE record published
2026-09-10 20:38 UTCUpdated Record last modified

apache impala UPGRADE

Affected: >= 4.0.0 and < 4.5.2

Fixed in: 4.5.2

Safe to downgrade to: a release before 4.0.0

1. Check installed version

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

2. UPGRADE to 4.5.2 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade impala

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 4.0.0 (Debian / Ubuntu)

apt-cache madison impala sudo apt install impala=<VERSION_BEFORE_4.0.0> sudo apt-mark hold impala

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

dnf --showduplicates list impala sudo dnf downgrade impala-<VERSION_BEFORE_4.0.0> sudo dnf versionlock add impala

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.

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-2026-56207?

impala: upgrade to 4.5.2. Exact commands for each OS are on this page.

Is CVE-2026-56207 being exploited?

CVE-2026-56207 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-2026-56207 affect?

CVE-2026-56207 affects impala. Severity is critical (CVSS 9.8). Signature of Bearer token is not verified in last step of SAML2 authentication for Impala's hs2-http interface, allowing altering user name and acting as another user. This issue affects Apache Impala: >=4.0.0. Users are recommended t

How urgent is CVE-2026-56207?

Priority 54/100. Critical severity; Remotely exploitable, no login, no user action; On your watchlist

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References

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