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CVE-2026-1184: Insecure Deserialization in GitLab
Platform
gitlab
Component
gitlab
Opgelost in
18.11.3
CVE-2026-1184 addresses an Insecure Deserialization vulnerability discovered in GitLab EE. This flaw allows an unauthenticated user to induce a denial of service (DoS) by uploading a specially crafted file. The vulnerability impacts GitLab EE versions ranging from 11.9.0 through 18.11.3, and is resolved in version 18.11.3.
Impact en Aanvalsscenarioswordt vertaald…
Successful exploitation of CVE-2026-1184 allows an attacker to disrupt GitLab services, rendering them unavailable to legitimate users. The attacker does not require authentication, significantly broadening the potential attack surface. The denial of service can manifest as system instability, performance degradation, or complete service outage. While the vulnerability doesn't directly lead to data exfiltration or code execution, the disruption of GitLab services can severely impact development workflows and project timelines. The impact is amplified in environments where GitLab is a critical component of the software development lifecycle.
Uitbuitingscontextwordt vertaald…
CVE-2026-1184 was published on 2026-05-14. Its severity is currently assessed as Medium (CVSS 6.5). No public proof-of-concept (POC) code has been publicly released as of this writing. There are no indications of active exploitation campaigns targeting this vulnerability. The vulnerability is not currently listed on CISA Known Exploited Vulnerabilities (KEV) catalog.
Dreigingsinformatie
Exploit Status
CVSS-vector
Wat betekenen deze metrics?
- Attack Vector
- Netwerk — op afstand uitbuitbaar via internet. Geen fysieke of lokale toegang vereist.
- Attack Complexity
- Laag — geen speciale voorwaarden vereist. Betrouwbaar uitbuitbaar.
- Privileges Required
- Laag — elk geldig gebruikersaccount is voldoende.
- User Interaction
- Geen — automatische en stille aanval. Slachtoffer doet niets.
- Scope
- Ongewijzigd — impact beperkt tot het kwetsbare component.
- Confidentiality
- Geen — geen vertrouwelijkheidsimpact.
- Integrity
- Geen — geen integriteitsimpact.
- Availability
- Hoog — volledige crash of uitputting van resources. Totale denial of service.
Getroffen Software
Zwakheidsclassificatie (CWE)
Tijdlijn
- Gereserveerd
- Gepubliceerd
Mitigatie en Workaroundswordt vertaald…
The primary mitigation for CVE-2026-1184 is to upgrade GitLab EE to version 18.11.3 or later. If immediate upgrade is not feasible, consider implementing temporary workarounds such as restricting file uploads from unauthenticated users or implementing stricter file validation rules. Review GitLab's file upload policies and ensure they are enforced. Monitor GitLab logs for suspicious file upload activity. After upgrading, verify the fix by attempting a file upload with a known malicious payload (in a controlled environment) to confirm the vulnerability is no longer exploitable.
Hoe te verhelpenwordt vertaald…
Actualice GitLab a la versión 18.9.7 o superior, 18.10.6 o superior, o 18.11.3 o superior para mitigar la vulnerabilidad de deserialización de datos no confiables. Esta actualización corrige la validación incorrecta de archivos cargados, previniendo posibles ataques de denegación de servicio.
Veelgestelde vragenwordt vertaald…
What is CVE-2026-1184 — Insecure Deserialization in GitLab?
CVE-2026-1184 is a Medium severity vulnerability in GitLab EE allowing unauthenticated users to trigger a denial of service by uploading a crafted file due to improper validation. It affects versions 11.9.0–18.11.3.
Am I affected by CVE-2026-1184 in GitLab?
You are affected if you are running GitLab EE versions 11.9.0 through 18.11.3. Versions prior to 18.11.3 are vulnerable to denial of service attacks.
How do I fix CVE-2026-1184 in GitLab?
Upgrade GitLab EE to version 18.11.3 or later to resolve the vulnerability. Consider temporary workarounds like restricting unauthenticated file uploads if immediate upgrade is not possible.
Is CVE-2026-1184 being actively exploited?
As of the current assessment, there are no indications of active exploitation campaigns targeting CVE-2026-1184.
Where can I find the official GitLab advisory for CVE-2026-1184?
Refer to the official GitLab security advisory for CVE-2026-1184 on the GitLab website: [https://gitlab.com/security/advisories/](https://gitlab.com/security/advisories/)
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