CVE-2026-59306Network attack vector

Data exposure and modification via untrusted-type deserialization

Published Aug 27, 2026 · Updated Aug 27, 2026

Untrusted-type deserialization in Spring Cloud Stream applications allows attackers to read or alter data via unspecified inputs. Spring has not disclosed the affected component or the deserialization operation that accepts an untrusted type; affected versions are 4.2.0 through 4.2.6, 4.3.0 through 4.3.3, and 5.0.0 through 5.0.2. Exploitation requires network access, high privileges, user interaction, and additional conditions, with reported effects limited to reading or altering data.

CVSS severity3.1
Low
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Untrusted-type deserialization in Spring Cloud Stream applications allows attackers to read or alter data via unspecified inputs. Spring has not disclosed the affected component or the deserialization operation that accepts an untrusted type; affected versions are 4.2.0 through 4.2.6, 4.3.0 through 4.3.3, and 5.0.0 through 5.0.2. Exploitation requires network access, high privileges, user interaction, and additional conditions, with reported effects limited to reading or altering data.

The record

CVE
CVE-2026-59306
Published
Aug 27, 2026
Updated
Aug 27, 2026
Vendor
Spring
Product
Spring Cloud Stream
Classifications
Unavailable
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Aug 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 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=4.2.0 <=4.2.6
  2. Affected versionversion=4.3.0 <=4.3.3
  3. Affected versionversion=5.0.0 <=5.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Spring · Spring Cloud Streamversion=4.2.0 <=4.2.6; version=4.3.0 <=4.3.3; version=5.0.0 <=5.0.2

Published CVSS scores

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

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo