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Description

A CRLF injection vulnerability exists in the OAuth2 AuthorizationUtils class. When constructing the WWW-Authenticate response header, the 'realm' parameter is concatenated without sanitizing Carriage Return (CR) and Line Feed (LF) characters. If an attacker can control the realm value, they can inject arbitrary HTTP headers or split the HTTP response entirely. Users are recommended to upgrade to versions 4.2.2 or 4.1.7, which fixes this issue.

PUBLISHED Reserved 2026-06-05 | Published 2026-06-12 | Updated 2026-06-12 | Assigner apache

Problem types

CWE-113 Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')

Product status

Default status
unaffected

4.2.0 (semver) before 4.2.2
affected

Any version before 4.1.7
affected

Credits

Guanping Zhang reported this vulnerability. finder

References

www.openwall.com/lists/oss-security/2026/06/11/7

lists.apache.org/thread/bt7vnjzzkpd6vdhkxv103poor1jy5trm vendor-advisory

cve.org (CVE-2026-50630)

nvd.nist.gov (CVE-2026-50630)

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