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CVE-2026-41849 is a high-severity denial-of-service vulnerability in Spring Framework caused by an integer overflow in the evaluation logic of the Spring Expression Language (SpEL). The flaw affects Spring Framework 5.3.0 through 5.3.48, and unsupported versions may also be affected. When an application parses and evaluates attacker-controlled or otherwise untrusted SpEL expressions, a specially crafted expression can trigger integer wraparound behavior in the SpEL evaluator, leading to excessive resource consumption. The issue is remotely exploitable in network-accessible applications that expose SpEL evaluation to untrusted input, without requiring authentication or user interaction.
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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.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Spring Framework denial-of-service vulnerability mentioned as background vendor security history.
A denial-of-service vulnerability in Spring Framework's Spring Expression Language (SpEL) evaluation logic caused by an integer overflow when processing specially crafted untrusted expressions.
A high-severity integer overflow denial-of-service vulnerability in Spring Framework's SpEL evaluation engine affecting Spring 5.3.x, allowing unauthenticated remote attackers to trigger excessive resource consumption via crafted expressions.
A vulnerability affecting Spring Framework 5.3.x; the content explicitly states Spring Framework 6.2.19 and 7.0.8 are not affected.
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.