Network metadata disclosure via premature outbound connections
Published Apr 23, 2026 · Updated Apr 23, 2026
Authorization bypass in WebKitGTK on Red Hat Enterprise Linux allows remote attackers to expose client network metadata via web content. WebKit opens sockets, performs DNS resolution, or completes TLS handshakes before the WebPage::send-request handler can block affected requests. Loading attacker-controlled content is required; successful connections disclose presence, source IP context, timing, and TLS capabilities without enabling data modification.
Summary
What happened
Authorization bypass in WebKitGTK on Red Hat Enterprise Linux allows remote attackers to expose client network metadata via web content. WebKit opens sockets, performs DNS resolution, or completes TLS handshakes before the WebPage::send-request handler can block affected requests. Loading attacker-controlled content is required; successful connections disclose presence, source IP context, timing, and TLS capabilities without enabling data modification.
The record
- CVE
- CVE-2025-66286
- Published
- Apr 23, 2026
- Updated
- Apr 23, 2026
- Vendor
- 389 Directory Server
- Product
- Red Hat Enterprise Linux 7
- Classifications
- CWE-639
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 23, 2026CVE publishedPublication date reported by the CVE source.
- Apr 23, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- WebKitGTK send-request reproducerproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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