OSSA-2026-049: Ironic Conductor DoS via gzip bomb configdrive

Date:

October 29, 2026

CVE:

CVE-2026-115638

Affects

• Ironic: >=16.2.0 <29.1.1, >=30.0.0 <32.1.1, >=33.0.0 <35.1.1, >=36.0.0 <39.0.1

Description

Jay Faulkner of G-Research Open Source Software reported a vulnerability in the Ironic conductor. The Ironic conductor can be subjected to an out of memory or disk full condition when attempting to extract a base64-encoded, gzipped configdrive image submitted via /v1/nodes/{node_ident}/states/provision when deploying a node.

This issue impacts environments where users have access to deploy instances directly via Ironic.

Patches

• https://review.opendev.org/1012759 (2024.1/caracal (unmaintained))

• https://review.opendev.org/1012134 (2025.1/epoxy)

• https://review.opendev.org/1012130 (2025.2/flamingo)

• https://review.opendev.org/1012123 (2026.1/gazpacho)

• https://review.opendev.org/1012122 (2026.2/hibiscus)

• https://review.opendev.org/1011906 (2027.1/indri (development))

• https://review.opendev.org/1012743 (2027.1/indri (development))

• https://review.opendev.org/1012133 (Bugfix/37.0)

• https://review.opendev.org/1012132 (Bugfix/38.0)

Credits

• Jay Faulkner from G-Research Open Source Software (CVE-2026-115638)

References

• https://launchpad.net/bugs/2171814

• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-115638

Notes

• Patches for unmaintained/2024.1, bugfix/38.0, and bugfix/37.0 will be merged to git but no new release will be provided.