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Fencer Vulns
high 7.5

CVE-2026-40972 json

Spring Boot DevTools remote secret comparison is vulnerable to timing attacks

published 2026-04-27 6 mo ago modified 2026-07-24 3 mo ago also GHSA-56v8-86gj-66jp , EUVD-2026-25936

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 18%
public exploits
0
none known

Summary

An attacker on the same network as the remote application may be able to utilize a timing attack to discover information about the remote secret. In extreme circumstances this could result in the attacker determining the secret and uploading changed classes, thereby achieving remote code execution in the remote application.

Affected: Spring Boot 4.0.0–4.0.5 (fix 4.0.6), 3.5.0–3.5.13 (fix 3.5.14), 3.4.0–3.4.15 (fix 3.4.16), 3.3.0–3.3.18 (fix 3.3.19), 2.7.0–2.7.32 (fix 2.7.33); DevTools remote secret comparison. Versions that are no longer supported are also affected per vendor advisory.

Patch / fix

  • maven org.springframework.boot:spring-boot-devtools 3.5.14, 4.0.6
  • Spring Spring Boot 2.7.33, 3.3.19, 3.4.16, 3.5.14, 4.0.6

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-2026-40972 updated cvss 7.5

Spring Boot: Spring Boot: Remote code execution via timing attack in DevTools remote secret comparison

  • Red Hat build of OptaPlanner 8 spring-boot
    affected: workaround, no fix available
  • Red Hat Fuse 7 spring-boot
    affected: workaround, no fix planned “Will not fix”
  • Red Hat HawtIO HawtIO 4.4.0
    fixed: vendor fix RHSA-2026:25089
  • Red Hat build of Apache Camel 4.18.1 for Spring Boot 3.5.14
    fixed: vendor fix RHSA-2026:17668
  • Red Hat OpenShift Dev Spaces 3.28 devspaces/openvsx-rhel9 1779528224, devspaces/pluginregistry-rhel9 1779359423
    fixed: vendor fix RHSA-2026:21772
  • Red Hat AMQ Broker 7 spring-boot Red Hat AMQ Clients spring-boot
    not affected: vulnerable code not present
  • Red Hat Data Grid 8 spring-boot
    not affected: component not present
  • Red Hat Enterprise Linux 8 log4j, log4j-jcl, log4j-web, log4j-slf4j Red Hat Enterprise Linux 9 log4j, log4j-jcl, log4j-slf4j Red Hat JBoss Enterprise Application Platform 7 spring-boot Red Hat JBoss Enterprise Application Platform 8 spring-boot Red Hat JBoss Enterprise Application Platform Expansion Pack spring-boot Red Hat OpenShift Dev Spaces 3.28 devspaces/udi-rhel9 1779829736, devspaces/code-rhel9 1779814592, devspaces/server-rhel9 1779342423, devspaces/traefik-rhel9 1779786779, devspaces/udi-base-rhel9 1779741066, devspaces/code-sshd-rhel9 1779813519, +8 more
    not affected: vulnerable code not present
show 2 more
  • Red Hat Process Automation 7 spring-boot
    not affected: vulnerable code not in execute path
  • Red Hat Single Sign-On 7 spring-boot
    not affected: component 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
total
Assessed
6 mo ago

Exploit prediction

0.26% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
maven org.springframework.boot:spring-boot-devtools
>=4.0.0, <4.0.6
>=3.5.0, <3.5.14
>=3.4.0, <=3.4.15
>=3.3.0, <=3.3.18
<=2.7.32
4.0.6
3.5.14

Affected products

  • Spring Spring Boot

Classification

Weakness
  • CWE-208 Observable Timing Discrepancy
Technology feeds

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.