CVE-2026-38974Network attack vector

Repository data disclosure via unverified SSH host keys

Published Jul 15, 2026 · Updated Jul 15, 2026

Improper SSH host-key validation in Dulwich 1.1.0 and earlier allows man-in-the-middle attackers to impersonate Git servers. The Paramiko SSH vendor in contrib/paramiko_vendor.py accepts an unknown server key because it neither loads known-host entries nor rejects unknown keys. Exploitation requires control of the network path to a Dulwich SSH connection and exposes repository data handled during the impersonated session.

CVSS severity5.3
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper SSH host-key validation in Dulwich 1.1.0 and earlier allows man-in-the-middle attackers to impersonate Git servers. The Paramiko SSH vendor in contrib/paramiko_vendor.py accepts an unknown server key because it neither loads known-host entries nor rejects unknown keys. Exploitation requires control of the network path to a Dulwich SSH connection and exposes repository data handled during the impersonated session.

The record

CVE
CVE-2026-38974
Published
Jul 15, 2026
Updated
Jul 15, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-295, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 15, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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.

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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-295Improper Certificate Validation
T1557Adversary-in-the-Middle

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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