GitLab Patches Multiple DoS & SSRF Vulnerabilities — CyberDudeBivash Advisory

Overview

GitLab recently released urgent patches for its Community and Enterprise Editions closing key security holes that allowed attackers to perform Denial-of-Service (DoS) attacks and Server-Side Request Forgery (SSRF). The fixes are included in the latest patch releases—18.3.2 (Sept 10), 18.3.1 (Aug 27), and 18.2.5 / 18.1.6 tiers. about.gitlab.com HKCERT

Vulnerability Breakdown

CVE-2025-2256 – SAML Response DoS

Type: Denial-of-Service via oversized SAML responses
Impact: Could render GitLab instances unresponsive
Severity: CVSS 7.5
Affected Versions: CE/EE from 7.12 up to before 18.1.6, 18.2 before 18.2.6, and 18.3 before 18.3.2 about.gitlab.com

CVE-2025-6454 – Webhook SSRF

Type: SSRF via crafted custom headers in webhooks
Impact: Authenticated users could make unauthorized internal requests via proxies
Severity: CVSS 8.5
Affected Versions: 16.11 < 18.1.6, < 18.2.6, < 18.3.2 about.gitlab.com

CVE-2025-1250 – DoS via Long User Input

Type: Denial-of-Service through oversized commit messages, merge requests, or notes
Severity: CVSS 6.5
Affected Versions: 15.0 < 18.1.6, < 18.2.6, < 18.3.2 about.gitlab.com

CVE-2025-7337 – DoS via Large File Upload

Type: Denial-of-Service via upload of very large files by authenticated developers
Severity: CVSS 6.5
Affected Versions: Same version ranges as above about.gitlab.com

CVE-2025-10094 – Token Listing DoS

Type: Denial-of-Service by creating tokens with excessively long names
Severity: CVSS 6.5
Versions: Affected across similar version ranges about.gitlab.com

CVE-2025-6769 – Info Disclosure via Runner Endpoint

Type: Privileged retrieval of maintenance notes through runner APIs
Severity: CVSS 4.3
Versions: Same as above about.gitlab.com

Additional Fixes (Medium severity)

18.3.1 patch release also addressed:
- Resource allocation limits issues in import functions (CVE-2025-3601)
- Missing authentication in GraphQL API (CVE-2025-2246)
- GraphQL-requested DoS (CVE-2025-4225)
- Code injection via repository ambiguity (CVE-2025-5101) about.gitlab.com

Broader Context

Earlier releases in 2025 (e.g. 18.2.1/18.2.5) and prior versions addressed security gaps in pipeline execution, unauthorized token impersonation, SSRF in dependency proxies, and YAML injection vulnerabilities. about.gitlab.com+1 Cyber Security News

Risk & Business Impact

DoS threats disrupt development pipelines and CI/CD workflows, causing productivity losses.
SSRF attacks jeopardize internal infrastructure, enabling pivot attacks from exposed endpoints to internal services.
Overall, these issues undermine both performance and trust.

Mitigation & Recommendations

Immediate Actions

Upgrade GitLab CE/EE to:
- 18.3.2, 18.2.6, or 18.1.6+
- Ensure you remediate the SAML DoS, webhook SSRF, and user-input DoS vectors. about.gitlab.com HKCERT

Medium-term Strategies

Rate-limit SAML assertions and configure robust webhook validation.
Implement WAF/IDS to flag anomalously large payloads or malformed GraphQL queries.
Audit privileged user access and minimize developer-level permissions where possible.

Long-term Defense

Monitor GraphQL endpoints and CI/CD channels for suspicious or oversized requests.
Incorporate CSPM and runtime monitoring tools that detect unusual usage patterns.
Adopt Zero Trust architecture for your DevOps platforms.

Cloud Workload Protection
CI/CD Security Best Practices
Managed Detection and Response (MDR) for DevOps
Zero Trust for Developer Platforms
High-Performance Incident Response Tools
GitLab CI Security Hardened Configurations

CyberDudeBivash Verdict

This patch set is mission-critical. GitLab is central to developer workflows—SSRF attacks and DoS flaws can cripple entire devops engines. Delay updating at your peril.

CyberDudeBivash classification: Tier-1 Urgent — critical for DevOps resiliency.

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