CVE-2023-4647Public exploitNetwork attack vector

Service interruption via unbounded branch and tag listings

Published Sep 1, 2023 · Updated Jun 2, 2026

Resource exhaustion in affected GitLab versions allows remote authenticated users to interrupt service through repository API requests. Gitlab::Pagination::GitalyKeysetPager accepts pagination=none for branch and tag endpoints, returning all references instead of enforcing the 100-item cap. Low-privileged API access and a sufficiently large repository are required; generating the unrestricted response can exhaust server resources.

CVSS severity5.3
Medium
EPSS probability0.73%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in affected GitLab versions allows remote authenticated users to interrupt service through repository API requests. Gitlab::Pagination::GitalyKeysetPager accepts pagination=none for branch and tag endpoints, returning all references instead of enforcing the 100-item cap. Low-privileged API access and a sufficiently large repository are required; generating the unrestricted response can exhaust server resources.

The record

CVE
CVE-2023-4647
Published
Sep 1, 2023
Updated
Jun 2, 2026
Vendor
GitLab
Product
GitLab
Classifications
CWE-770, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 1, 2023CVE publishedPublication date reported by the CVE source.
  2. Jun 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=15.2 <16.1.5
  2. Affected versionversion=16.2 <16.2.5
  3. Affected versionversion=16.3 <16.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GitLab · GitLabversion=15.2 <16.1.5; version=16.2 <16.2.5; version=16.3 <16.3.1

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.3GitLab Inc.CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

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 exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.004Application or System Exploitation

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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