CVE-2026-13165Network attack vector

Remote code execution via mismatched archive parsers

Published Jun 29, 2026 · Updated Jun 29, 2026

Unrestricted native-library upload in SzafirHost before 1.2.2 allows remote attackers to execute code through a crafted archive. JarFile verifies only Central Directory entries, while JarInputStream extracts a hidden local-header DLL, SO, or DYLIB without a hash check. Exploitation requires control of the served archive and active user interaction; successful injection runs a native library on the host.

CVSS severity8.6
High
EPSS probability0.71%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted native-library upload in SzafirHost before 1.2.2 allows remote attackers to execute code through a crafted archive. JarFile verifies only Central Directory entries, while JarInputStream extracts a hidden local-header DLL, SO, or DYLIB without a hash check. Exploitation requires control of the served archive and active user interaction; successful injection runs a native library on the host.

The record

CVE
CVE-2026-13165
Published
Jun 29, 2026
Updated
Jun 29, 2026
Vendor
Krajowa Izba Rozliczeniowa S.A.
Product
SzafirHost
Classifications
CWE-434, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 29, 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 <1.2.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Krajowa Izba Rozliczeniowa S.A. · SzafirHostversion=0 <1.2.2

Published CVSS scores

8.6CERT PolskaCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:L/SI:L/SA: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-434Unrestricted Upload of File with Dangerous Type
T1204.002User Execution: Malicious File

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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