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Fencer Intel
medium 4.3

CVE-2026-115638 json

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…

published 17d ago modified 11d ago also EUVD-2026-108570

cvss
4.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 12%
public exploits
0
none known

Summary

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.

Patch / fix

  • ironic Debian 14 1:39.0.0-7

debian advisories DEBIAN-CVE-2026-115638

Is CVE-2026-115638 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-115638 updated cvss 4.3

openstack-ironic: openstack-ironic: Denial of Service via decompression bomb in configdrive

  • Red Hat OpenShift Container Platform 4 openstack-ironic, openstack-ironic-api, python3-ironic-tests, openstack-ironic-common, openstack-ironic-conductor Red Hat OpenStack Platform 13 (Queens) openstack-ironic-api, openstack-ironic-common, openstack-ironic-conductor Red Hat OpenStack Platform 16.2 openstack-ironic, openstack-ironic-api, openstack-ironic-common, openstack-ironic-conductor Red Hat OpenStack Platform 17.1 openstack-ironic, openstack-ironic-api, openstack-ironic-common, openstack-ironic-conductor Red Hat OpenStack Platform 18.0 openstack-ironic
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
14d ago

Exploit prediction

0.22% chance of exploitation in the next 30 days, higher than 12% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Affected products

  • OpenStack Ironic

Classification

Weakness
  • CWE-409 Improper Handling of Highly Compressed Data (Data Amplification)

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.