CVE-2023-0121Public exploitNetwork attack vector

Service crashes via unbounded report decompression

Published Jun 7, 2023 · Updated Jan 7, 2025

Resource exhaustion in affected GitLab releases allows remote authenticated users to crash services via crafted report artifacts. The Gitlab::Ci::Build::Artifacts::Adapters::GzipStream class calls gz.read without a length limit, buffering the expanded stream in Puma or Sidekiq memory. Pipeline access is required to upload the artifact; public-project API requests can then retrigger it without authentication and interrupt web or background processing.

CVSS severity6.5
Medium
EPSS probability1.24%
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 releases allows remote authenticated users to crash services via crafted report artifacts. The Gitlab::Ci::Build::Artifacts::Adapters::GzipStream class calls gz.read without a length limit, buffering the expanded stream in Puma or Sidekiq memory. Pipeline access is required to upload the artifact; public-project API requests can then retrigger it without authentication and interrupt web or background processing.

The record

CVE
CVE-2023-0121
Published
Jun 7, 2023
Updated
Jan 7, 2025
Vendor
GitLab
Product
GitLab
Classifications
CWE-770, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 7, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 7, 2025Record 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=>=13.2.4, <15.10.8
  2. Affected versionversion=>=15.11, <15.11.7
  3. Affected versionversion=>=16.0, <16.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GitLab · GitLabversion=>=13.2.4, <15.10.8; version=>=15.11, <15.11.7; version=>=16.0, <16.0.2

Published CVSS scores

6.5GitLabCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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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