CVE-2026-34881 — glance
MEDIUMCVE-2026-34881 is a medium-severity (CVSS 5) Server-Side Request Forgery (SSRF) vulnerability in glance. A fix is available for glance — see the affected versions and patch details below.
OpenStack Glance is affected by Server-Side Request Forgery (SSRF)
Exploitation Status
Proof-of-concept exploit code exists
- CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
Exploitation and automatability from CISA’s SSVC triage for CVE-2026-34881.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
CVE-2026-34881 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 377,636 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
glance🐍glance🐍glanceReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.
Description
OpenStack Glance versions < 29.1.1, >= 30.0.0 < 30.1.1, == 31.0.0 are affected by Server-Side Request Forgery (SSRF). By use of HTTP redirects, an authenticated user can bypass URL validation checks and redirect to internal services. Only the glance image import functionality is affected. In particular, the web-download and glance-download import methods are subject to this vulnerability, as is the optional (not enabled by default) ovf_process image import plugin.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | glance | all versions | 29.2.0pip install --upgrade 'glance==29.2.0' |
| 🐍PyPI | glance | ≥ 30.0.0&&< 30.2.0 | 30.2.0pip install --upgrade 'glance==30.2.0' |
| 🐍PyPI | glance | ≥ 31.0.0&&< 31.1.0 | 31.1.0pip install --upgrade 'glance==31.1.0' |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for glance, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update glance to 29.2.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-34881 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2026-34881 can be triaged on real exposure rather than presence alone.
Tailored to CVE-2026-34881. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
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…
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat OpenStack Platform 16.2 | openstack-glance-1:19.0.5-2.20260512165254.eb6ad61.el8ost | RHSA-2026:54757 |
| Red Hat OpenStack Services on OpenShift 18.0 | openstack-glance-1:26.1.1-18.0.20260422134725.c2ac316.el9ost | RHSA-2026:39812 |
Frequently Asked Questions
Is CVE-2026-34881 in your dependencies?
O3 Security finds CVE-2026-34881 across PyPI dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.