# CVE-2026-89078 — GitLab

> As of 2026-09-25, CVE-2026-89078 is a CRITICAL-severity vulnerability in GitLab, CVSS v3.1 9.9, EPSS 0.4% (36.3th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-89078, most recently “GitLab CE/EE max-severity unauthenticated code execution flaw in CI/CD Regular Expression Compiler (CVE-2026-97229)”.

**Last updated:** 2026-09-25

## What is CVE-2026-89078?

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 19.2 before 19.2.7, 19.3 before 19.3.3, and 19.4 before 19.4.1 that under certain conditions could have allowed an authenticated user to execute arbitrary code on the GitLab server due to a double free issue when parsing a specially crafted regular expression in a CI/CD configuration.

The record classifies CVE-2026-89078 under weakness class [CWE-415](https://intel.threadlinqs.com/cwe/CWE-415). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 19 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 9.9 — CRITICAL (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L`)
- **EPSS (FIRST):** 0.4% probability of exploitation in the next 30 days, higher than 36.3% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 6.4/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-09-23, last modified 2026-09-25

## Is CVE-2026-89078 being exploited?

It currently carries a trending score of 39 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [GitLab](https://intel.threadlinqs.com/vendors/gitlab): GitLab

## How to fix CVE-2026-89078

No vendor patch reference has been recorded for CVE-2026-89078 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-89078

1 tracked threat in the Threadlinqs corpus references CVE-2026-89078, either in the campaign’s CVE list or as an indicator on the campaign record.

- [GitLab CE/EE max-severity unauthenticated code execution flaw in CI/CD Regular Expression Compiler (CVE-2026-97229)](https://intel.threadlinqs.com/threat/TL-2026-3356) — CRITICAL · 2026-10-12

## Sources

Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-10-12.

**Exploit and proof of concept**

- [hackerone.com — technical description](https://hackerone.com/reports/4019059)

**Other references**

- [gitlab.com](https://gitlab.com/gitlab-org/gitlab/-/work_items/628577)
- [docs.gitlab.com](https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-4-1-released/)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-89078
Full detection coverage and IOCs for threats exploiting CVE-2026-89078 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp