CVE-2026-59323Network attack vector

Application crash via unbounded baggage allocations

Published Aug 21, 2026 · Updated Aug 21, 2026

Denial of service in Micrometer Tracing affected releases allows remote attackers to crash applications via crafted baggage headers. The W3CBaggagePropagator parses every incoming key-value entry and creates a BaggageField without limiting the entry count or header size. Exploitation requires W3C and baggage propagation with a baggage manager, untrusted input, and a receiving server whose header limit is large enough to induce CPU and memory exhaustion.

CVSS severity5.3
Medium
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Micrometer Tracing affected releases allows remote attackers to crash applications via crafted baggage headers. The W3CBaggagePropagator parses every incoming key-value entry and creates a BaggageField without limiting the entry count or header size. Exploitation requires W3C and baggage propagation with a baggage manager, untrusted input, and a receiving server whose header limit is large enough to induce CPU and memory exhaustion.

The record

CVE
CVE-2026-59323
Published
Aug 21, 2026
Updated
Aug 21, 2026
Vendor
Spring
Product
Spring Framework
Classifications
CWE-770, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=1.4.13 and earlier <1.4.14
  2. Affected versionversion=1.5.0 - 1.5.12 <1.5.13
  3. Affected versionversion=1.6.0 - 1.6.6 <1.6.6.1
  4. Affected versionversion=1.6.0 - 1.6.6 <1.6.7
  5. Affected versionversion=1.7.0 - 1.7.0 <1.7.0.1
  6. Affected versionversion=1.7.0 - 1.7.0 <1.7.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Spring · Spring Frameworkversion=1.4.13 and earlier <1.4.14; version=1.5.0 - 1.5.12 <1.5.13; version=1.6.0 - 1.6.6 <1.6.6.1; version=1.6.0 - 1.6.6 <1.6.7; version=1.7.0 - 1.7.0 <1.7.0.1; version=1.7.0 - 1.7.0 <1.7.1

Published CVSS scores

5.3GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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