GHSA-f5f4-3hh4-f54m: github.com/openshift-pipelines/pipelines-as-code (CVE-2026-54167)

Package	Ecosystem	Affected	Fixed in
github.com/openshift-pipelines/pipelines-as-code	Go	>=0.43.0, <0.48.0 \|\| >=0.40.0, <0.42.1 \|\| >=0.38.0, <0.39.6 \|\| <0.37.8	0.48.0, 0.42.1, 0.39.6, 0.37.8

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Pipelines-as-Code versions before 0.37.8, from 0.38.0 before 0.39.6, from 0.40.0 before 0.42.1, and from 0.43.0 before 0.48.0 are affected. An attacker who can reach the webhook endpoint can send a crafted GitHub webhook with an attacker-chosen Enterprise Host header, which causes the controller to send a GitHub App JWT to that host and may let the attacker mint installation access tokens within the JWT's validity window. Upgrade to 0.37.8, 0.39.6, 0.42.1, 0.48.0, or later; until then, strip or block unexpected X-GitHub-Enterprise-Host headers at the proxy in front of the webhook endpoint.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
8.2	High	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0027, the 19th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:11 UTC First seen by agentprime
31 Oct 2026, 14:11 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.