CVE-2026-21764: HCL DevOps Loop is affected by insufficient input validation that allows special characters where they should

Routine

LOW 3.1DOWNGRADE

CVE-2026-21764 is a low-severity flaw (CVSS 3.1) affecting devops loop. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

HCL DevOps Loop is affected by insufficient input validation that allows special characters where they should be restricted. This may result in unintended application behavior under certain conditions.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	3.1 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 88%)
CISA exploited list	No
Weakness	CWE-754
Published	2026-07-17
Last modified	2026-10-24

Publisher (CNA): HCL Software · Vendor: hcltech

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-17 17:17 UTCPublished CVE record published
2026-10-24 20:10 UTCUpdated Record last modified

hcltech devops loop DOWNGRADE

Affected: 2.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0.0

1. Check installed version

apt-cache policy devops-loop || rpm -q devops-loop || devops-loop --version

2. No fixed release: DOWNGRADE to a release before 2.0.0 (Debian / Ubuntu)

apt-cache madison devops-loop sudo apt install devops-loop=<VERSION_BEFORE_2.0.0> sudo apt-mark hold devops-loop

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list devops-loop sudo dnf downgrade devops-loop-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add devops-loop

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-2026-21764?

devops loop: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-21764 being exploited?

CVE-2026-21764 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-2026-21764 affect?

CVE-2026-21764 affects devops loop. Severity is low (CVSS 3.1). HCL DevOps Loop is affected by insufficient input validation that allows special characters where they should be restricted. This may result in unintended application behavior under certain conditions.

How urgent is CVE-2026-21764?

Priority 14/100. No elevated risk signals yet.

Related CVEs

CVE-2026-21762 LOW 3.7 DOWNGRADE HCL DevOps Loop is affected by missing HTTP security headers
CVE-2026-21760 MEDIUM 4.6 DOWNGRADE HCL DevOps Loop is affected by an Unauthorized Access to Admin Functionality (Forced Browsing) vulnerability
CVE-2026-21761 MEDIUM 4.2 DOWNGRADE HCL DevOps Loop is affected by a Cross-Origin Resource Sharing (CORS) misconfiguration

References

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