# CVE-2026-73117: Apache Juneau: Response header CRLF injection and open redirect when applications set headers or redirect targets from request data

Status: published. Published: 2026-11-05. Updated: 2026-11-05.

Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting') vulnerability in Apache Juneau.

The Apache Juneau REST server passed response header values and redirect targets to the servlet container unchecked. An application that sets a response header or redirect target from request data could let a remote client inject header lines (where the servlet container does not itself reject CR/LF) or redirect users to an arbitrary external site. The framework itself does not build headers or redirects from request data; exposure depends on application code.

This issue affects Apache Juneau: through 9.2.0.

Users are recommended to upgrade to version 9.2.1, which fixes the issue. Header values are now sanitized by default; applications that build redirect targets from request data must also switch from sendRedirect() to the new sendSafeRedirect().

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Apache Software Foundation / Apache Juneau (org.apache.juneau:juneau-rest-server): ≥ 0; < 9.2.1 (affected, semver). Source: CNA: apache

## Severity and prioritization

- CVSS 4.0: 10 (critical); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H; source: CNA: apache

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-113

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://lists.apache.org/thread.html/j05q7vw08j48o96tdlzcsd4sozx1lyl6 (CNA: apache; vendor-advisory)

## Provenance

- CNA: apache: https://www.cve.org/CVERecord?id=CVE-2026-73117; retrieved 2026-11-05; source updated 2026-11-05

Revision: bb79a15656a73954ee1209d8e546c7b603cc5ef541e6ea526daa321b7078a803

Canonical: https://y2.dev/cve/CVE-2026-73117

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