CVE-2026-83280: 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-webserver-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 the helidon-webserver-http2 component of Oracle Helidon, versions 4.0.0 to 4.5.4. An unauthenticated attacker with network access via HTTP/2 can exploit this flaw to cause the Helidon server to hang or crash repeatedly, resulting in a complete denial of service. The CVSS 3.1 base score is 7.5, reflecting a high impact on availability with no impact on confidentiality or integrity. Oracle has included a fix for this vulnerability in their September 2026 Critical Security Patch Update, which covers Helidon versions 3.0.0-3.2.20 and 4.0.0-4.5.4.
Potential Impact
Successful exploitation results in an unauthorized denial of service condition by causing the Helidon server to hang or crash repeatedly. There is no impact on confidentiality or integrity. The vulnerability can be exploited remotely without authentication via HTTP/2 network access.
Mitigation Recommendations
Oracle has released patches for this vulnerability in the September 2026 Critical Security Patch Update covering affected Helidon versions 4.0.0 through 4.5.4. Users should apply these official patches promptly to remediate the 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-2026-83280: 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-webserver-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 the helidon-webserver-http2 component of Oracle Helidon, versions 4.0.0 to 4.5.4. An unauthenticated attacker with network access via HTTP/2 can exploit this flaw to cause the Helidon server to hang or crash repeatedly, resulting in a complete denial of service. The CVSS 3.1 base score is 7.5, reflecting a high impact on availability with no impact on confidentiality or integrity. Oracle has included a fix for this vulnerability in their September 2026 Critical Security Patch Update, which covers Helidon versions 3.0.0-3.2.20 and 4.0.0-4.5.4.
Potential Impact
Successful exploitation results in an unauthorized denial of service condition by causing the Helidon server to hang or crash repeatedly. There is no impact on confidentiality or integrity. The vulnerability can be exploited remotely without authentication via HTTP/2 network access.
Mitigation Recommendations
Oracle has released patches for this vulnerability in the September 2026 Critical Security Patch Update covering affected Helidon versions 4.0.0 through 4.5.4. Users should apply these official patches promptly to remediate the 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: 6aa9a83855bf5e2cf5538133
Added to database: 09/15/2026, 20:19:04 UTC
Last enriched: 09/15/2026, 22:58:37 UTC
Last updated: 09/16/2026, 03:03:35 UTC
Views: 2
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.