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CVE-2026-41855VulnerabilityPublished Updated

Libspring java:

Affects libspring-javaSource GCVE Database

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Authoritative record:CVE-2026-41855· High 8.1

Not known to be exploited · CVSS 8.1 High.

Data as of 5 Nov 2026, 12:51 UTC

CVSS 3.1 base score
8.1High
How severe the flaw is on the 0–10 CVSS scale.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 9 Jun 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
Ubuntu 26.10libspring-javapkg:deb/ubuntu/libspring-java?arch=source&distro=stonkingOther threatsAffected
  • =4.3.30-3ubuntu1
Fixed in–
Ubuntu 26.04 LTSlibspring-javapkg:deb/ubuntu/libspring-java?arch=source&distro=resoluteOther threatsAffected
  • =4.3.30-3ubuntu1
Fixed in–
Ubuntu 25.10libspring-javapkg:deb/ubuntu/libspring-java?arch=source&distro=questingOther threatsAffected
  • =4.3.30-2ubuntu1
  • =4.3.30-3ubuntu1
Fixed in–
Ubuntu Pro 24.04 LTSlibspring-javapkg:deb/ubuntu/libspring-java?arch=source&distro=esm-apps/nobleOther threatsAffected
  • =4.3.30-2
  • =4.3.30-2ubuntu0.24.04.1~esm1
Fixed in–
Ubuntu Pro 22.04 LTSlibspring-javapkg:deb/ubuntu/libspring-java?arch=source&distro=esm-apps/jammyOther threatsAffected
  • =4.3.30-1
  • =4.3.30-1ubuntu0.1~esm1
Fixed in–
Ubuntu Pro 20.04 LTSlibspring-javapkg:deb/ubuntu/libspring-java?arch=source&distro=esm-apps/focalOther threatsAffected
  • =4.3.22-4
  • =4.3.22-4ubuntu0.1~esm1
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Until a fix is available, avoid using these JMS message converters in untrusted environments or apply strict input validation and deserialization controls.

Description

A critical deserialization vulnerability exists in Spring Framework's JMS message converters (MappingJackson2MessageConverter and JacksonJsonMessageConverter) when used in untrusted JMS environments. This flaw allows arbitrary class instantiation via gadget class deserialization, potentially enabling unauthorized actions. The vulnerability affects multiple Spring Framework versions from 5.3.0 through 7.0.7.

References

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