CVE-2026-22187Public exploit

Code execution via untrusted memo deserialization

Published Jan 7, 2026 · Updated Jan 7, 2026

Unsafe deserialization in Open Microscopy Environment Bio-Formats 8.3.0 and earlier allows attackers to execute code via crafted .bfmemo files. The loci.formats.Memoizer class automatically passes an image's adjacent memoization cache to Java deserialization without validation, integrity verification, or trust enforcement. Processing an image with an attacker-supplied cache triggers the flaw; code execution requires a suitable classpath gadget chain, while malformed data can interrupt image processing.

CVSS severity6.8
Medium
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unsafe deserialization in Open Microscopy Environment Bio-Formats 8.3.0 and earlier allows attackers to execute code via crafted .bfmemo files. The loci.formats.Memoizer class automatically passes an image's adjacent memoization cache to Java deserialization without validation, integrity verification, or trust enforcement. Processing an image with an attacker-supplied cache triggers the flaw; code execution requires a suitable classpath gadget chain, while malformed data can interrupt image processing.

The record

CVE
CVE-2026-22187
Published
Jan 7, 2026
Updated
Jan 7, 2026
Vendor
Open Microscopy Environment
Product
Bio-Formats
Classifications
CWE-502, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 7, 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=0 <=8.3.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Open Microscopy Environment · Bio-Formatsversion=0 <=8.3.0

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:H/SC:N/SI:N/SA: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.

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No observations available

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

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1204.002User Execution: Malicious File

Public exploit references

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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