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CVE-2026-40972VulnerabilityPublished Updated

Org.springframework.boot:spring boot devtools: Spring Boot DevTools remote secret comparison is vulnerable to timing

Affects org.springframework.boot:spring-boot-devtoolsSource GCVE Database

0
Authoritative record:CVE-2026-40972· High 7.5

Not known to be exploited · CVSS 7.5 High : upgrade to 4.0.6 soon.

Data as of 27 Oct 2026, 00:07 UTC

CVSS 3.1 base score
7.5High
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 4.0.6, 3.5.14
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 27 Apr 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Upgrade org.springframework.boot:spring-boot-devtools to 4.0.6; org.springframework.boot:spring-boot-devtools to 3.5.14.

Affected software

ProductAffectedFixed in
Mavenorg.springframework.boot:spring-boot-devtoolsAffected
  • >=4.0.0 <4.0.6
Fixed in
  • 4.0.6
Mavenorg.springframework.boot:spring-boot-devtoolsAffected
  • >=3.5.0 <3.5.14
Fixed in
  • 3.5.14
Mavenorg.springframework.boot:spring-boot-devtoolsAffected
  • >=3.4.0 <=3.4.15
Fixed in–
Mavenorg.springframework.boot:spring-boot-devtoolsAffected
  • >=3.3.0 <=3.3.18
Fixed in–
Mavenorg.springframework.boot:spring-boot-devtoolsAffected
  • <=2.7.32
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Description

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.

References

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