CVE-2026-40972: spring spring boot Observable Timing Discrepancy
Vulnerability summary
CVE-2026-40972 is a high (CVSS 7.5) Observable Timing Discrepancy vulnerability in spring spring boot. EPSS estimates a 0.33% chance of exploitation in the next 30 days, higher than 24% of scored vulnerabilities.
Timeline
- 27-04-2026PublishedVulnerability first disclosed.
- 29-04-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
3 scores · 3 sources · 1 version- OSV · MavenEcosystem advisory · calculated7.5HighCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- NVDNIST7.5HighCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.33%
Chance of exploitation in the next 30 days
Percentile
24%
Versus all other CVEs
30-day change
+0.06 pp
From 0.26% on 18-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Org.springframework.boot1 product
- 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
Spring1 product
- spring boot≥ 4.0.0, < 4.0.6 | ≥ 3.5.0, < 3.5.14 | ≥ 3.4.0, < 3.4.16 | ≥ 3.3.0, < 3.3.19 | ≥ 2.7.0, < 2.7.33
Vmware1 product
- spring_boot< 2.7.33 | ≥ 3.3.0, < 3.3.19 | ≥ 3.4.0, < 3.4.16 | ≥ 3.5.0, < 3.5.14 | ≥ 4.0.0, < 4.0.6
3 vendors · 3 products
