GitLab AI Gateway: Server-Side Request Forgery
CVE-2026-75871 is a critical-severity server-side request forgery vulnerability in GitLab AI Gateway from GitLab, with a CVSS 3.1 base score of 9.6 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, without any action from a user. The record lists versions 19.0.12, 19.1.7, 19.2.2 as the first without the flaw, so updating GitLab AI Gateway to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.34% chance of exploitation within 30 days, which is low compared with other CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Update GitLab AI Gateway to 19.0.12 or 19.1.7 or 19.2.2, whichever matches your release line, or a later version.
- Update Gitlab to 19.0.12 or 19.1.7 or 19.2.2, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| GitLab | GitLab AI Gateway | 18.10 up to, but not including, 19.0.12; 19.1 up to, but not including, 19.1.7; 19.2 up to, but not including, 19.2.2 | 19.0.12, 19.1.7, 19.2.2 |
| GitLab | Gitlab | 18.10.0 up to, but not including, 19.0.12; 19.1.0 up to, but not including, 19.1.7; 19.2.0 up to, but not including, 19.2.2 | 19.0.12, 19.1.7, 19.2.2 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- ChangedThe attack can reach beyond the vulnerable component into other systems.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- NoneAvailability is not affected.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 8.2 | High | CNA (gitlab.com) |
| CVSS 3.1 | 9.6 | Critical | NVD |
Official description
GitLab has remediated a vulnerability in the GitLab AI Gateway component affecting all versions of the AI Gateway from 18.10 to 19.0.12, 19.1 to 19.1.7, and 19.2 to 19.2.2 that could have allowed an authenticated user with Duo Agent Platform access to redirect outbound model requests to an externally-controlled endpoint via a crafted inline flow configuration that overrides the HTTP Host header, resulting in disclosure of Google Cloud Vertex cloud service credentials and private signing keys.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Server-Side Request Forgery
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.
How developers prevent this class of flaw
- If there is a known list of applications, IP, hostname, and/or domains to which the product is allowed to communicate, then use allowlists to ensure that outgoing requests are restricted to these known entities. The allowlists could be in the application code or possibly enforced by firewalls or network segmentation.
- If the product is expected to be able to connect to arbitrary IP addresses or domains, consider using a denylist that includes private network addresses, internal domain names, etc. The denylist could be in the application code or possibly enforced by firewalls or network segmentation.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: poc, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
Other vulnerabilities in GitLab AI Gateway
- 9.9 Critical severity
- 8.2 High severity
- 9.9 Critical severity
Recent Server-Side Request Forgery vulnerabilities
- 7.5 High severity
- 8.6 High severity
- 8.6 High severity
- 8.7 High severity
- 7.3 High severity
- 7.1 High severity
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