CVE-2026-1662
Published: 25 February 2026
Summary
CVE-2026-1662 is a high-severity Allocation of Resources Without Limits or Throttling (CWE-770) vulnerability in Gitlab Gitlab. Its CVSS base score is 7.5 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Application Exhaustion Flood (T1499.003); ranked at the 15.4th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
Threat & Defense at a Glance
Threat & Defense Details
Likely Mitigating ControlsAI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
This control implements explicit throttling on session allocation, addressing the weakness of allocating resources without limits.
Plan testing exercises resource allocation limits and throttling during simulated failures, directly addressing weaknesses that allow unbounded resource use.
Contingency plan updates ensure recovery strategies address unbounded resource allocation, making it harder for attackers to exploit lack of throttling to cause prolonged outages.
Provides continuity when unbounded resource allocation at the primary site leads to exhaustion and downtime.
Alternate services allow operations to continue when primary allocation of resources lacks limits or throttling.
Explicit planning of security-related actions requires defining limits, windows, and resource allocations, making allocation without throttling far less likely.
Measures of performance include tracking allocation behavior and throttling effectiveness, reducing the window for resource exhaustion attacks.
Imposes an inactivity-based limit on network resource allocation, throttling the number of concurrently held connections.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Directly enables application-layer resource exhaustion DoS via crafted requests to a public endpoint (CWE-770).
NVD Description
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 14.4 before 18.7.5, 18.8 before 18.8.5, and 18.9 before 18.9.1 that could have allowed an unauthenticated user to cause Denial of Service by sending specially crafted requests to…
more
the Jira events endpoint.
Deeper analysisAI
CVE-2026-1662 is a denial-of-service vulnerability in GitLab Community Edition (CE) and Enterprise Edition (EE), affecting all versions from 14.4 prior to 18.7.5, 18.8 prior to 18.8.5, and 18.9 prior to 18.9.1. The flaw enables an unauthenticated user to trigger a DoS condition by sending specially crafted requests to the Jira events endpoint. It carries a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) and is linked to CWE-770 (Allocation of Resources Without Limits or Throttling).
An unauthenticated attacker with network access can exploit this vulnerability with low attack complexity and no user interaction. Exploitation involves sending malformed requests to the affected endpoint, leading to high-impact resource exhaustion and service disruption on vulnerable GitLab instances, without affecting confidentiality or integrity.
GitLab has remediated the issue through patches released in versions 18.7.5, 18.8.5, and 18.9.1, as detailed in the February 25, 2026 patch release notes for GitLab 18.9.1. Additional technical details and the remediation discussion are available in GitLab issue 588206 and HackerOne report 3519694. Security teams should prioritize upgrading affected instances to mitigate exposure.
Details
- CWE(s)