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CVE-2026-40972 is a timing side-channel vulnerability in Spring Boot DevTools remote access. The vulnerable HttpHeaderAccessManager implementation compares the configured remote secret to an attacker-supplied value using Java String.equals(), whose early-exit behavior leaks timing information about matching secret prefixes. An adjacent-network attacker may use repeated requests to infer the secret character by character. After recovering the secret, the attacker can authenticate to the remote DevTools service and submit changed classes through its live-reload functionality, potentially resulting in remote code execution. Affected versions are Spring Boot 4.0.0 through 4.0.5, 3.5.0 through 3.5.13, 3.4.0 through 3.4.15, 3.3.0 through 3.3.18, and 2.7.0 through 2.7.32; unsupported versions are also affected.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Spring Boot vulnerability allowing remote code execution via a timing attack against DevTools remote secret comparison.
A Spring Boot remote code execution vulnerability caused by a timing attack in DevTools remote secret comparison.
A timing side-channel vulnerability in Spring Boot DevTools remote access manager that allows an adjacent network attacker to recover the remote secret and then achieve remote code execution via the DevTools live reload mechanism.
A Spring Boot DevTools vulnerability involving remote secret comparison timing attacks, mentioned as also fixed in Spring Boot 4.0.6.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.