CVE-2026-12635Network attack vector

Internal network requests via reverse DNS validation

Published Jun 25, 2026 · Updated Jun 25, 2026

SSRF in GitLab CE/EE 8.3 through 18.11.5, 19.0 through 19.0.2, and 19.1.0 allows remote authenticated users to reach internal services. Repository mirror synchronization relies on reverse DNS results during URL validation, allowing a mirror endpoint to pass the internal-network restriction. Maintainer-role access and mirror synchronization are required; the published impact is limited to outbound internal requests.

CVSS severity0.0
None
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in GitLab CE/EE 8.3 through 18.11.5, 19.0 through 19.0.2, and 19.1.0 allows remote authenticated users to reach internal services. Repository mirror synchronization relies on reverse DNS results during URL validation, allowing a mirror endpoint to pass the internal-network restriction. Maintainer-role access and mirror synchronization are required; the published impact is limited to outbound internal requests.

The record

CVE
CVE-2026-12635
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
GitLab
Product
GitLab
Classifications
CWE-350
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 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=19.0 <19.0.3
  2. Affected versionversion=19.1 <19.1.1
  3. Affected versionversion=8.3 <18.11.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GitLab · GitLabversion=19.0 <19.0.3; version=19.1 <19.1.1; version=8.3 <18.11.6

Published CVSS scores

3.1NIST NVDCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
0.0GitLab Inc.CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/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.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-350Reliance on Reverse DNS Resolution for a Security-Critical Action

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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