Path Traversal in Angular Angular-Cli

CVE-2026-44437

The Angular SSR is a server-rise rendering tool for Angular applications. From 19.0.0-next.0 to before 19.2.25, 20.3.25, 21.2.9, and 22.0.0-next.7, a vulnerability exists in the X-Forwarded-Prefix header processing logic within Angular SSR. The internal validation mechanism fails to properly account for URL-encoded characters, specifically dots (%2e%2e). This allows an attacker to bypass security filters by injecting encoded path traversal sequences that are later decoded and utilized by the application logic. When an Angular SSR application is configured to trust proxy headers and is deployed behind a proxy that forwards the X-Forwarded-Prefix header without prior sanitization, an attacker can provide a payload such as /%2e%2e/evil. This vulnerability is fixed in19.2.25, 20.3.25, 21.2.9, and 22.0.0-next.7.

Vulnerability class: Path Traversal (Directory Traversal)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.002 (10.3th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 10th percentile — 10.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-44437: held from 0.003 to 0.002.

EPSS over last 30 days · oldest: 0.003 · newest: 0.002 · change: -0.001

Affected products

  • Angular Angular-Cli — versions >= 22.0.0-next.0, < 22.0.0-next.7, >= 21.0.0-next.0, < 21.2.9, >= 20.0.0-next.0, < 20.3.25
  • Angular Cli — versions 22.0.0

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-44437?
CVE-2026-44437 is a medium-severity vulnerability in Angular Angular-Cli, classified under Path Traversal. CVSS score: 6.1/10. Published 2026-05-13.
How severe is CVE-2026-44437?
Medium severity. CVSS v3 base score is 6.1 out of 10.