GitLab Community Edition/Enterprise Edition up to 18.7.3/18.8.3 Markdown File allocation of resources

CVSS Meta Temp Score
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CTI Interest Score
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5.8$0-$5k0.00

Summaryinfo

A vulnerability was found in GitLab Community Edition and Enterprise Edition up to 18.7.3/18.8.3. It has been rated as problematic. This affects an unknown part of the component Markdown File Handler. This manipulation causes allocation of resources. This vulnerability is tracked as CVE-2026-1456. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic was found in GitLab Community Edition and Enterprise Edition up to 18.7.3/18.8.3. Affected by this vulnerability is an unknown function of the component Markdown File Handler. The manipulation with an unknown input leads to a allocation of resources vulnerability. The CWE definition for the vulnerability is CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. As an impact it is known to affect availability. The summary by CVE is:

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.7 before 18.7.4, and 18.8 before 18.8.4 that could have allowed an unauthenticated user to cause denial of service through CPU exhaustion by submitting specially crafted markdown files that trigger exponential processing in markdown preview.

The weakness was disclosed by maksyche. The advisory is shared at gitlab.com. This vulnerability is known as CVE-2026-1456 since 01/26/2026. The exploitation appears to be easy. The attack can be launched remotely. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 298876 (GitLab 18.7 < 18.7.4 / 18.8 < 18.8.4 (CVE-2026-1456)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 18.7.4 or 18.8.4 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (298876). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.8
VulDB Meta Temp Score: 5.8

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔒

CNA Base Score: 6.5
CNA Vector (GitLab): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Allocation of resources
CWE: CWE-770 / CWE-400 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 298876
Nessus Name: GitLab 18.7 < 18.7.4 / 18.8 < 18.8.4 (CVE-2026-1456)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Community Edition/Enterprise Edition 18.7.4/18.8.4

Timelineinfo

01/26/2026 CVE reserved
02/11/2026 +16 days Advisory disclosed
02/11/2026 +0 days VulDB entry created
02/13/2026 +2 days VulDB entry last update

Sourcesinfo

Vendor: gitlab.com

Advisory: gitlab.com
Researcher: maksyche
Status: Confirmed

CVE: CVE-2026-1456 (🔒)
GCVE (CVE): GCVE-0-2026-1456
GCVE (VulDB): GCVE-100-345457

Entryinfo

Created: 02/11/2026 13:08
Updated: 02/13/2026 02:19
Changes: 02/11/2026 13:08 (65), 02/12/2026 22:50 (11), 02/13/2026 02:19 (2)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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