CVE-2026-48737Public exploitNetwork attack vectorHinoki check available

Authenticated SSRF via IPv6 transition-address misclassification

Published Sep 15, 2026 · Updated Sep 15, 2026

SSRF in pyLoad before 0.5.0b3.dev101 allows remote authenticated users to reach internal IPv4 services through IPv6 transition addresses. The is_global_address guard accepts 6to4 and NAT64 wrappers as global without rechecking their embedded IPv4 destinations. An account with ADD permission and a host that routes the relevant transition mechanism are required; exploitation enables internal reconnaissance, timing confirmation, limited service interruption, or cloud metadata disclosure.

CVSS severity4.9
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

SSRF in pyLoad before 0.5.0b3.dev101 allows remote authenticated users to reach internal IPv4 services through IPv6 transition addresses. The is_global_address guard accepts 6to4 and NAT64 wrappers as global without rechecking their embedded IPv4 destinations. An account with ADD permission and a host that routes the relevant transition mechanism are required; exploitation enables internal reconnaissance, timing confirmation, limited service interruption, or cloud metadata disclosure.

The record

CVE
CVE-2026-48737
Published
Sep 15, 2026
Updated
Sep 15, 2026
Vendor
pyLoad
Product
pyLoad
Classifications
CWE-918, CAPEC-664, T1046
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

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

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.5.0b3.dev101

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

pyLoad · pyLoadversion=< 0.5.0b3.dev101

Published CVSS scores

4.9GitHubCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A: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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
CAPEC-664Server Side Request Forgery
T1046Network Service Discovery

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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