GHSA-fcmm-42r9-mmmm

Suggest an improvement
Source
https://github.com/advisories/GHSA-fcmm-42r9-mmmm
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-fcmm-42r9-mmmm/GHSA-fcmm-42r9-mmmm.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-fcmm-42r9-mmmm
Aliases
Downstream
CGA (4)
ECHO (1)
MINI (2)
Published
2026-08-12T18:31:18Z
Modified
2026-10-02T23:40:42Z
Severity
  • 5.4 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N CVSS Calculator
Summary
Apache Airflow XCom API permits unsafe deserialization through JSON string literals
Details

Apache Airflow's XCom GET /api/v2/{...}/xcomEntries/{key}?deserialize=true endpoint passed a string-literal payload through BaseXCom.deserialize_value without the _check_forbidden_xcom_keys guard, allowing an authenticated API user with XCom write-and-read access to instantiate arbitrary airflow.* classes on the API server (CWE-502). An authenticated user who can write an XCom value and then read it back with deserialize=true triggers the unsafe instantiation. Users are advised to upgrade to apache-airflow 3.3.1 or later, which rejects reserved XCom serialization keys submitted as JSON string literals.

Database specific 
{
    "cwe_ids":  [
        "CWE-502"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-10-02T23:12:55Z",
    "nvd_published_at":  "2026-08-12T16:17:09Z",
    "severity":  "MODERATE"
}
References

Affected packages

PyPI / apache-airflow

Package

Name
apache-airflow
View open source insights on deps.dev
Purl
pkg:pypi/apache-airflow

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
3.3.1

Affected versions

1.*
1.8.1
1.8.2rc1
1.8.2
1.9.0
1.10.0
1.10.1b1
1.10.1rc2
1.10.1
1.10.2b2
1.10.2rc1
1.10.2rc2
1.10.2rc3
1.10.2
1.10.3b1
1.10.3b2
1.10.3rc1
1.10.3rc2
1.10.3
1.10.4b2
1.10.4rc1
1.10.4rc2
1.10.4rc3
1.10.4rc4
1.10.4rc5
1.10.4
1.10.5rc1
1.10.5
1.10.6rc1
1.10.6rc2
1.10.6
1.10.7rc1
1.10.7rc2
1.10.7rc3
1.10.7
1.10.8rc1
1.10.8
1.10.9rc1
1.10.9
1.10.10rc1
1.10.10rc2
1.10.10rc3
1.10.10rc4
1.10.10rc5
1.10.10
1.10.11rc1
1.10.11rc2
1.10.11
1.10.12rc1
1.10.12rc2
1.10.12rc3
1.10.12rc4
1.10.12
1.10.13rc1
1.10.13
1.10.14rc1
1.10.14rc2
1.10.14rc3
1.10.14rc4
1.10.14
1.10.15rc1
1.10.15
2.*
2.0.0b1
2.0.0b2
2.0.0b3
2.0.0rc1
2.0.0rc2
2.0.0rc3
2.0.0
2.0.1rc1
2.0.1rc2
2.0.1
2.0.2rc1
2.0.2
2.1.0rc1
2.1.0rc2
2.1.0
2.1.1rc1
2.1.1
2.1.2rc1
2.1.2
2.1.3rc1
2.1.3
2.1.4rc1
2.1.4rc2
2.1.4
2.2.0b1
2.2.0b2
2.2.0rc1
2.2.0
2.2.1rc1
2.2.1rc2
2.2.1
2.2.2rc1
2.2.2rc2
2.2.2
2.2.3rc1
2.2.3rc2
2.2.3
2.2.4rc1
2.2.4
2.2.5rc1
2.2.5rc2
2.2.5rc3
2.2.5
2.3.0b1
2.3.0rc1
2.3.0rc2
2.3.0
2.3.1rc1
2.3.1
2.3.2rc1
2.3.2rc2
2.3.2
2.3.3rc1
2.3.3rc2
2.3.3rc3
2.3.3
2.3.4rc1
2.3.4
2.4.0b1
2.4.0rc1
2.4.0
2.4.1rc1
2.4.1
2.4.2rc1
2.4.2
2.4.3rc1
2.4.3
2.5.0rc1
2.5.0rc2
2.5.0rc3
2.5.0
2.5.1rc1
2.5.1rc2
2.5.1
2.5.2rc1
2.5.2rc2
2.5.2
2.5.3rc1
2.5.3rc2
2.5.3
2.6.0b1
2.6.0rc1
2.6.0rc2
2.6.0rc3
2.6.0rc4
2.6.0rc5
2.6.0
2.6.1rc1
2.6.1rc2
2.6.1rc3
2.6.1
2.6.2rc1
2.6.2rc2
2.6.2
2.6.3rc1
2.6.3
2.7.0b1
2.7.0rc1
2.7.0rc2
2.7.0
2.7.1rc1
2.7.1rc2
2.7.1
2.7.2rc1
2.7.2
2.7.3rc1
2.7.3
2.8.0b1
2.8.0rc1
2.8.0rc2
2.8.0rc3
2.8.0rc4
2.8.0
2.8.1rc1
2.8.1
2.8.2rc1
2.8.2rc2
2.8.2rc3
2.8.2
2.8.3rc1
2.8.3
2.8.4rc1
2.8.4
2.9.0b1
2.9.0b2
2.9.0rc1
2.9.0rc2
2.9.0rc3
2.9.0
2.9.1rc1
2.9.1rc2
2.9.1
2.9.2rc1
2.9.2
2.9.3rc1
2.9.3
2.10.0b1
2.10.0b2
2.10.0rc1
2.10.0
2.10.1rc1
2.10.1
2.10.2rc1
2.10.2
2.10.3rc1
2.10.3rc2
2.10.3
2.10.4rc1
2.10.4
2.10.5rc1
2.10.5
2.11.0rc1
2.11.0
2.11.1rc1
2.11.1rc2
2.11.1
2.11.2rc1
2.11.2
3.*
3.0.0b4
3.0.0rc1
3.0.0rc1.post1
3.0.0rc1.post2
3.0.0rc1.post3
3.0.0rc1.post4
3.0.0rc2
3.0.0rc3
3.0.0rc4
3.0.0
3.0.1rc1
3.0.1
3.0.2rc1
3.0.2rc2
3.0.2
3.0.3rc1
3.0.3rc2
3.0.3rc3
3.0.3rc4
3.0.3rc5
3.0.3rc6
3.0.3
3.0.4rc1
3.0.4rc2
3.0.4
3.0.5rc1
3.0.5rc2
3.0.5rc3
3.0.5
3.0.6rc1
3.0.6rc2
3.0.6
3.1.0b1
3.1.0b2
3.1.0rc1
3.1.0rc2
3.1.0
3.1.1rc1
3.1.1rc2
3.1.1
3.1.2rc1
3.1.2rc2
3.1.2
3.1.3rc1
3.1.3
3.1.4rc1
3.1.4rc2
3.1.4
3.1.5rc1
3.1.5
3.1.6rc1
3.1.6
3.1.7rc1
3.1.7rc2
3.1.7
3.1.8rc1
3.1.8rc2
3.1.8
3.2.0b1
3.2.0b2
3.2.0rc1
3.2.0rc2
3.2.0
3.2.1rc1
3.2.1rc2
3.2.1rc3
3.2.1
3.2.2rc1
3.2.2rc2
3.2.2rc3
3.2.2
3.3.0b1
3.3.0b2
3.3.0rc1
3.3.0rc2
3.3.0
3.3.1rc1
3.3.1rc2

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-fcmm-42r9-mmmm/GHSA-fcmm-42r9-mmmm.json"