Unbounded cache for function definitions

published 2026-06-01 5 mo ago modified 2026-07-22 3 mo ago also GHSA-x4h3-g2x4-8gqv , EUVD-2026-33734

cvss: 5.7; 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 11%
public exploits: 0; none known

OOM error is possible while attempting to add infinite amount of functions to Function Registry.

Affected Spring Products and Versions: Spring Cloud Function 3.2.x: versions prior to 3.2.16 Spring Cloud Function 4.1.x: versions prior to 4.1.10 Spring Cloud Function 4.2.x: versions prior to 4.2.6 Spring Cloud Function 4.3.x: versions prior to 4.3.3 Spring Cloud Function 5.0.x: versions prior to 5.0.2 Older, unsupported versions are also affected.

Patch / fix

fixed in 2

maven org.springframework.cloud:spring-cloud-function-context 4.3.3, 5.0.2
Spring Spring Cloud Function 3.2.16, 4.1.10, 4.2.6, 4.3.3, 5.0.2

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-2026-40990 updated 2026-08-08 cvss 5.5

spring-cloud-function: Spring Cloud Function: Denial of Service via excessive function registration

Red Hat JBoss Enterprise Application Platform Expansion Pack spring-cloud-function-context
not affected: vulnerable code not present

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: 5 mo ago (2026-06-01)

Exploit prediction

0.21% chance of exploitation in the next 30 days, higher than 11% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.7	CVSS:3.1/AV:P/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:H
NVD	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
GitHub	3.1	5.7	CVSS:3.1/AV:P/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:H

Affected packages

ecosystem	package	affected	fixed in
maven	org.springframework.cloud:spring-cloud-function-context	>=4.3.0, <4.3.3 >=5.0.0, <5.0.2 >=3.2.10, <=3.2.15 >=4.1.0, <=4.1.9 >=4.2.0, <=4.2.5	4.3.3 5.0.2

Affected products

Spring Spring Cloud Function

Classification

Weakness

CWE-770 Allocation of Resources Without Limits or Throttling

Technology feeds

Spring rss critical rss

References

spring.io /security/cve-2026-40990
web, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2026-40990
advisory

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.

Summary