CVE-2026-34881
Description
A flaw was found in OpenStack Glance. An authenticated user can exploit a Server-Side Request Forgery (SSRF) vulnerability within the web-download import feature. This vulnerability stems from inadequate validation of Uniform Resource Identifiers (URIs), which can be circumvented using HTTP redirects or alternative IP encodings. Successful exploitation allows an attacker to gain unauthorized access to internal network resources and potentially exfiltrate sensitive data.
Statement
This is an IMPORTANT flaw in OpenStack Glance's web-download import feature allows an authenticated user to perform Server-Side Request Forgery (SSRF). The vulnerability arises from insufficient validation of URIs, which can be bypassed through HTTP redirects or alternative IP encodings. This enables an attacker to access internal network resources and potentially exfiltrate sensitive information within the cloud environment.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7.1 | N/A | 7.1 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | High | N/A | High |
| Integrity Impact | None | N/A | None |
| Availability Impact | Low | N/A | Low |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L
cve.org: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Application Data
Integrity
Technical Impact: Execute Unauthorized Code or Commands
Access Control
Technical Impact: Bypass Protection Mechanism
By providing URLs to unexpected hosts or ports, attackers can make it appear that the server is sending the request, possibly bypassing access controls such as firewalls that prevent the attackers from accessing the URLs directly. The server can be used as a proxy to conduct port scanning of hosts in internal networks, use other URLs such as that can access documents on the system (using file://), or use other protocols such as gopher:// or tftp://, which may provide greater control over the contents of requests.
Acknowledgements
This issue was discovered by Abhishek Kekane (Red Hat) and Hyeongeun_Ji (Open the Window).
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