CVE-2026-33397: The Angular SSR is a server-rise rendering tool for Angular applications

Q: How do I fix CVE-2026-33397?

angular cli: upgrade to 20.3.21, 21.2.3. Exact commands for each OS are on this page.

Q: Is CVE-2026-33397 being exploited?

CVE-2026-33397 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-33397 affect?

CVE-2026-33397 affects angular cli. Severity is medium (CVSS 6.1). The Angular SSR is a server-rise rendering tool for Angular applications. Versions on the 22.x branch prior to 22.0.0-next.2, the 21.x branch prior to 21.2.3, and the 20.x branch prior to 20.3.21 have an Open Redirect vulnerability in `@ang

Q: How urgent is CVE-2026-33397?

Priority 26/100. No elevated risk signals yet.

Routine

MEDIUM 6.1UPGRADE

CVE-2026-33397 is a medium-severity flaw (CVSS 6.1) affecting angular cli. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Angular SSR is a server-rise rendering tool for Angular applications. Versions on the 22.x branch prior to 22.0.0-next.2, the 21.x branch prior to 21.2.3, and the 20.x branch prior to 20.3.21 have an Open Redirect vulnerability in `@angular/ssr` due to an incomplete fix for CVE-2026-27738. While the original fix successfully blocked multiple leading slashes (e.g., `///`), the internal validation logic fails to account for a single backslash (

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 82%)
CISA exploited list	No
Weakness	CWE-601
Published	2026-03-26
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: angular

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-26 15:16 UTCPublished CVE record published
2026-06-17 10:37 UTCUpdated Record last modified

angular angular cli UPGRADE

Affected: >= 20.0.0 and < 20.3.21 · >= 21.0.0 and < 21.2.3 · 22.0.0 next0 · 22.0.0 next1

Fixed in: 20.3.21, 21.2.3

Safe to downgrade to: a release before 20.0.0

1. Check installed version

npm ls angular-cli

2. UPGRADE to 20.3.21

npm install angular-cli@">=20.3.21"

3. If no update is available yet, DOWNGRADE to a release before 20.0.0

npm view angular-cli versions npm install angular-cli@"<20.0.0"

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-2026-33397?

angular cli: upgrade to 20.3.21, 21.2.3. Exact commands for each OS are on this page.

Is CVE-2026-33397 being exploited?

CVE-2026-33397 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-2026-33397 affect?

CVE-2026-33397 affects angular cli. Severity is medium (CVSS 6.1). The Angular SSR is a server-rise rendering tool for Angular applications. Versions on the 22.x branch prior to 22.0.0-next.2, the 21.x branch prior to 21.2.3, and the 20.x branch prior to 20.3.21 have an Open Redirect vulnerability in `@ang

How urgent is CVE-2026-33397?

Priority 26/100. No elevated risk signals yet.

Software pages

Angular vulnerabilities

Related CVEs

CVE-2026-44437 MEDIUM 6.1 UPGRADE The Angular SSR is a server-rise rendering tool for Angular applications
CVE-2026-32635 CRITICAL 9.0 UPGRADE Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript

References

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