CVE-2026-83276: Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP/2 to compromise Helidon. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Helidon. in Oracle Corporation Helidon
Vulnerability in the Helidon product of Oracle Fusion Middleware (component: helidon-webclient-http2). Supported versions that are affected are 4.0.0-4.5.4. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP/2 to compromise Helidon. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Helidon. CVSS 3.1 Base Score 7.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
AI Analysis
Technical Summary
This vulnerability affects Oracle Helidon versions 4.0.0 to 4.5.4 in the helidon-webclient-http2 component. An unauthenticated attacker with network access via HTTP/2 can exploit this flaw to cause a hang or repeated crash, resulting in a complete denial of service (DoS). The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) confirms that the attack requires no privileges or user interaction and impacts availability only. Oracle has addressed this vulnerability in its September 2026 Critical Security Patch Update, which includes patches for Helidon and other products.
Potential Impact
Successful exploitation results in a denial of service condition by causing the Helidon service to hang or crash repeatedly. There is no impact on confidentiality or integrity, but availability is severely affected. The vulnerability can be exploited remotely without authentication via HTTP/2 network access.
Mitigation Recommendations
Oracle has released patches for this vulnerability as part of the September 2026 Critical Security Patch Update. Users of Helidon versions 4.0.0 through 4.5.4 should apply the official patches promptly to remediate this issue. Oracle strongly recommends remaining on actively supported versions and applying security patches without delay. No alternative mitigations or workarounds are specified in the advisory.
CVE-2026-83276: Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP/2 to compromise Helidon. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Helidon. in Oracle Corporation Helidon
Description
Vulnerability in the Helidon product of Oracle Fusion Middleware (component: helidon-webclient-http2). Supported versions that are affected are 4.0.0-4.5.4. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP/2 to compromise Helidon. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Helidon. CVSS 3.1 Base Score 7.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
CVSS v3.1
Score 7.5high
Affected software
Oracle Corporation
Helidon
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability affects Oracle Helidon versions 4.0.0 to 4.5.4 in the helidon-webclient-http2 component. An unauthenticated attacker with network access via HTTP/2 can exploit this flaw to cause a hang or repeated crash, resulting in a complete denial of service (DoS). The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) confirms that the attack requires no privileges or user interaction and impacts availability only. Oracle has addressed this vulnerability in its September 2026 Critical Security Patch Update, which includes patches for Helidon and other products.
Potential Impact
Successful exploitation results in a denial of service condition by causing the Helidon service to hang or crash repeatedly. There is no impact on confidentiality or integrity, but availability is severely affected. The vulnerability can be exploited remotely without authentication via HTTP/2 network access.
Mitigation Recommendations
Oracle has released patches for this vulnerability as part of the September 2026 Critical Security Patch Update. Users of Helidon versions 4.0.0 through 4.5.4 should apply the official patches promptly to remediate this issue. Oracle strongly recommends remaining on actively supported versions and applying security patches without delay. No alternative mitigations or workarounds are specified in the advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- oracle
- Date Reserved
- 2026-08-31T15:40:57.350Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://www.oracle.com/security-alerts/cspusep2026.html","vendor":"Oracle"}]
Threat ID: 6aa9a83855bf5e2cf553812f
Added to database: 09/15/2026, 20:19:04 UTC
Last enriched: 09/15/2026, 22:58:10 UTC
Last updated: 09/15/2026, 23:32:04 UTC
Views: 2
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