CVE-2026-33155Public exploitNetwork attack vector

Application crash via unchecked pickle constructor arguments

Published Mar 20, 2026 · Updated Mar 20, 2026

Uncontrolled resource consumption in Zepworks DeepDiff 5.0.0 through 8.6.1 allows remote attackers to crash applications via crafted pickles. The restricted unpickler allows REDUCE to invoke allowlisted bytes constructors with attacker-controlled sizes, while Delta applies value changes before converting types without a size guard. Exploitation requires an application to deserialize an untrusted delta or call pickle_load on untrusted data; the resulting allocation exhausts memory and crashes the process.

CVSS severity8.7
High
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in Zepworks DeepDiff 5.0.0 through 8.6.1 allows remote attackers to crash applications via crafted pickles. The restricted unpickler allows REDUCE to invoke allowlisted bytes constructors with attacker-controlled sizes, while Delta applies value changes before converting types without a size guard. Exploitation requires an application to deserialize an untrusted delta or call pickle_load on untrusted data; the resulting allocation exhausts memory and crashes the process.

The record

CVE
CVE-2026-33155
Published
Mar 20, 2026
Updated
Mar 20, 2026
Vendor
Zepworks
Product
DeepDiff
Classifications
CWE-400, CWE-770, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 20, 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=>= 5.0.0, < 8.6.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Zepworks · DeepDiffversion=>= 5.0.0, < 8.6.2

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/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.

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 exploitPublished

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
CWE-770Allocation of Resources Without Limits or Throttling
T1499Endpoint Denial of Service

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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