CVE-2026-22741Network attack vector

Front-end disruption via encoded-resource cache poisoning

Published Apr 29, 2026 · Updated Apr 29, 2026

Cache poisoning in Spring Framework allows remote attackers to disrupt front-end clients through crafted static-resource requests. The MVC and WebFlux resource-chain cache stores an encoded static resource under an entry that attackers can prime with the wrong content encoding. Exploitation requires enabled resource-chain caching, encoded-resource resolution, and an empty cache; a client must then request the poisoned resource for front-end breakage.

CVSS severity3.1
Low
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cache poisoning in Spring Framework allows remote attackers to disrupt front-end clients through crafted static-resource requests. The MVC and WebFlux resource-chain cache stores an encoded static resource under an entry that attackers can prime with the wrong content encoding. Exploitation requires enabled resource-chain caching, encoded-resource resolution, and an empty cache; a client must then request the poisoned resource for front-end breakage.

The record

CVE
CVE-2026-22741
Published
Apr 29, 2026
Updated
Apr 29, 2026
Vendor
Spring
Product
Spring Framework
Classifications
CWE-524, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.3.0 <5.3.48
  2. Affected versionversion=6.1.0 <6.1.27
  3. Affected versionversion=6.2.0 <6.2.18
  4. Affected versionversion=7.0.0 <7.0.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Spring · Spring Frameworkversion=5.3.0 <5.3.48; version=6.1.0 <6.1.27; version=6.2.0 <6.2.18; version=7.0.0 <7.0.7

Published CVSS scores

3.1VMwareCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-524Use of Cache Containing Sensitive Information
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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