CVE-2026-27315: Sensitive Information Leak in cqlsh in Apache Cassandra 4.0 allows access to sensitive information, like passw

Routine

MEDIUM 5.5WATCHLISTUPGRADE

CVE-2026-27315 is a medium-severity flaw (CVSS 5.5) affecting cassandra. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Sensitive Information Leak in cqlsh in Apache Cassandra 4.0 allows access to sensitive information, like passwords, from previously executed cqlsh command via ~/.cassandra/cqlsh_history local file access. Users are recommended to upgrade to version 4.0.20, which fixes this issue. -- Description: Cassandra's command-line tool, cqlsh, provides a command history feature that allows users to recall previously executed commands using the up/down ar

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 95%)
CISA exploited list	No
Weakness	CWE-532
Published	2026-04-07
Last modified	2026-10-26

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

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-07 17:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

apache cassandra UPGRADE

Affected: >= 4.0.0 and < 4.0.20

Fixed in: 4.0.20

Safe to downgrade to: a release before 4.0.0

1. Check installed version

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

2. UPGRADE to 4.0.20 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cassandra

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 cassandra sudo apt install cassandra=<VERSION_BEFORE_4.0.0> sudo apt-mark hold cassandra

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

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

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-2026-27315?

cassandra: upgrade to 4.0.20. Exact commands for each OS are on this page.

Is CVE-2026-27315 being exploited?

CVE-2026-27315 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-2026-27315 affect?

CVE-2026-27315 affects cassandra. Severity is medium (CVSS 5.5). Sensitive Information Leak in cqlsh in Apache Cassandra 4.0 allows access to sensitive information, like passwords, from previously executed cqlsh command via ~/.cassandra/cqlsh_history local file access. Users are recommended to upgrade

How urgent is CVE-2026-27315?

Priority 26/100. On your watchlist

Software pages

Apache Cassandra vulnerabilities

Related CVEs

CVE-2026-27314 HIGH 8.8 UPGRADE Privilege escalation in Apache Cassandra 5.0 on an mTLS environment using MutualTlsAuthenticator allows a user
CVE-2026-32588 MEDIUM 6.5 UPGRADE Authenticated DoS over CQL in Apache Cassandra 4.0, 4.1, 5.0 allows authenticated user to raise query latencie

References

← Back to latest CVEs