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Fencer Vulns
medium 6.2

CVE-2023-27484 json

Unchecked fieldpath index in Composition's patches can lead to arbitrary memory allocation in crossplane

published 2023-03-09 3 y ago modified 2026-09-10 1 mo ago also GHSA-v829-x6hh-cqfq , EUVD-2023-1107

cvss
6.2
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 52%
public exploits
0
none known

Summary

crossplane-runtime is a set of go libraries used to build Kubernetes controllers in Crossplane and its related stacks. In affected versions an already highly privileged user able to create or update Compositions can specify an arbitrarily high index in a patch's `ToFieldPath`, which could lead to excessive memory usage once such Composition is selected for a Composite resource. Compositions allow users to specify patches inserting elements into arrays at an arbitrary index. When a Composition is selected for a Composite Resource, patches are evaluated and if a specified index is greater than the current size of the target slice, Crossplane will grow that slice up to the specified index, which could lead to an excessive amount of memory usage and therefore the Pod being OOM-Killed. The index is already capped to the maximum value for a uint32 (4294967295) when parsed, but that is still an unnecessarily large value. This issue has been addressed in versions 1.11.2, 1.10.3, and 1.9.2. Users are advised to upgrade. Users unable to upgrade can restrict write privileges on Compositions to only admin users as a workaround.

Patch / fix

  • go github.com/crossplane/crossplane 1.9.2, 1.10.3, 1.11.2
  • crossplane crossplane 1.9.2, 1.10.3, 1.11.2

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
20 mo ago

Exploit prediction

0.68% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.2 CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H
NVD 3.1 4.9 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 6.2 CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
go github.com/crossplane/crossplane
<1.9.2
>=1.10.0, <1.10.3
>=1.11.0, <1.11.2
1.9.2
1.10.3
1.11.2

Affected products

  • crossplane crossplane

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption
  • CWE-20 Improper Input Validation

References

Sources

Fencer Vulns 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.