CVE-2026-55420

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2026-55420
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55420.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-55420
Aliases
Published
2026-07-09T17:54:07Z
Modified
2026-10-28T02:30:37Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
Discourse: Remote code execution via pdf uploads
Details

Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, under certain non-default configurations, processing of PDF uploads could be exploited to obtain RCE on the server. This issue is patched in 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-78"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55420.json"
}
References

Affected packages

Git / github.com/discourse/discourse

Affected ranges

Type
GIT
Repo
https://github.com/discourse/discourse
Events
Introduced
322d3c0ac6a8f133b3f82875e9dbbe310f638c1b
Fixed
c06899647d758493d95a5b301e573ffa3db1e878
Introduced
fdd750d960e603415db62242eca3c30d68e366db
Fixed
4bbdddfc6700ca23604242111d4fa0e00347af97
Introduced
640840d818f4ee9375829ece0ef452923bb0c012
Fixed
598586ccf2e046a25d4b54132e4e1feb47f24e98
Introduced
06d03da34c4ed09ea59f917f045ba250d2b6320d
Fixed
ca5a7e06167561928556afa2f237d67e459c6914
Fixed
06d03da34c4ed09ea59f917f045ba250d2b6320d
Database specific
Show details 
{
    "extracted_events": [
        {
            "cpe": "cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "2026.1.0"
                },
                {
                    "fixed": "2026.1.5"
                }
            ],
            "source": "CPE_RANGE"
        },
        {
            "cpe": "cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "2026.4.0"
                },
                {
                    "fixed": "2026.4.2"
                }
            ],
            "source": "CPE_RANGE"
        },
        {
            "cpe": "cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "2026.5.0"
                },
                {
                    "fixed": "2026.5.1"
                }
            ],
            "source": "CPE_RANGE"
        },
        {
            "cpe": "cpe:2.3:a:discourse:discourse:2026.6.0:*:*:*:latest:*:*:*",
            "range": [
                {
                    "introduced": "2026.6.0"
                },
                {
                    "last_affected": "2026.6.0"
                }
            ],
            "source": "CPE_STRING"
        },
        {
            "range": [
                {
                    "fixed": "ca5a7e06167561928556afa2f237d67e459c6914"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "original_tag": "v2026.1.5",
            "range": [
                {
                    "fixed": "c06899647d758493d95a5b301e573ffa3db1e878"
                }
            ],
            "source": "REFERENCES_TAG"
        },
        {
            "original_tag": "v2026.4.2",
            "range": [
                {
                    "fixed": "4bbdddfc6700ca23604242111d4fa0e00347af97"
                }
            ],
            "source": "REFERENCES_TAG"
        },
        {
            "original_tag": "v2026.5.1",
            "range": [
                {
                    "fixed": "598586ccf2e046a25d4b54132e4e1feb47f24e98"
                }
            ],
            "source": "REFERENCES_TAG"
        },
        {
            "original_tag": "v2026.6.0",
            "range": [
                {
                    "fixed": "06d03da34c4ed09ea59f917f045ba250d2b6320d"
                }
            ],
            "source": "REFERENCES_TAG"
        }
    ]
}

Affected versions

2026.*
2026.6.0
Other
esr
stable
v2026.*
v2026.1.0
v2026.1.0-latest
v2026.1.1
v2026.1.2
v2026.1.3
v2026.1.4
v2026.4.0
v2026.4.0-latest
v2026.4.1
v2026.5.0
v2026.5.0-latest
v2026.5.0-latest.1

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55420.json"