CVE-2026-50131

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Source
https://cve.org/CVERecord?id=CVE-2026-50131
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-50131.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-50131
Aliases
  • GHSA-xw9q-2mv6-9fr8
Published
2026-06-10T20:27:43.370Z
Modified
2026-07-08T08:13:42.308723338Z
Severity
  • 8.6 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L CVSS Calculator
Summary
Fedify has an incomplete SSRF mitigation after GHSA-p9cg-vqcc-grcx: validatePublicUrl allows special-use IPv4 ranges
Details

Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Fedify previously addressed SSRF/internal network access in GHSA-p9cg-vqcc-grcx by adding public URL validation before runtime document and media fetching. However, the IPv4 validation logic present starting in version 0.11.2 and prior to versions 1.9.12, 1.10.11, 2.0.19, 2.1.15, and 2.2.4 appears incomplete. The validatePublicUrl() protection relies on isValidPublicIPv4Address() to reject non-public IPv4 destinations. The function blocks common private and local ranges such as 10.0.0.0/8, 127.0.0.0/8, 169.254.0.0/16, 172.16.0.0/12, and 192.168.0.0/16, but it still treats several special-use, reserved, multicast, benchmarking, and carrier-grade NAT IPv4 ranges as valid public destinations. Because this validation is used as an SSRF defense before outbound fetches, this appears to be an incomplete mitigation or bypass class for the previous SSRF issue. Versions 1.9.12, 1.10.11, 2.0.19, 2.1.15, and 2.2.4 contain an updated patch.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50131.json",
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-1286",
        "CWE-1389",
        "CWE-918"
    ]
}
References

Affected packages

Git / github.com/fedify-dev/fedify

Affected ranges

Type
GIT
Repo
https://github.com/fedify-dev/fedify
Events
Introduced
d9cf85ed7e85e256895ca95be7a3950d377903d2
Fixed
5b2f65e0a5215bb8c93c6022190a5407a77e6f64
Introduced
e4277717b0cad40c6282aae3dd14d4016cda45af
Fixed
8eb4ed10db15b6c7bd62e747fe9cd12945334063
Introduced
9568bcde77d3f1df90e2a790f5ff81b5bc787c5d
Fixed
0bdad17af89f2bb8c55818c709608d105814380b
Introduced
49bfb3679ceaf3c20e4029033d19aed6f5cd9d0c
Fixed
2e1122e5a88efc8f87a266c762f16258ddc4e410
Introduced
7c1bc8ab6e7f70c54fde4be3372dcd113f3f7947
Fixed
e6fe71d87df25742878fb643e8da528911c94491
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
0bdad17af89f2bb8c55818c709608d105814380b
Database specific 
{
    "source": "AFFECTED_FIELD",
    "extracted_events": [
        {
            "introduced": "0.11.2"
        },
        {
            "fixed": "1.9.12"
        },
        {
            "introduced": "1.10.0"
        },
        {
            "fixed": "1.10.11"
        },
        {
            "introduced": "2.0.0"
        },
        {
            "fixed": "2.0.19"
        },
        {
            "introduced": "2.1.0"
        },
        {
            "fixed": "2.1.15"
        },
        {
            "introduced": "2.2.0"
        },
        {
            "fixed": "2.2.4"
        },
        {
            "introduced": "0"
        }
    ]
}

Affected versions

0.*
0.1.0
0.10.0
0.11.0
0.12.0
0.13.0
0.14.0
0.15.0
0.2.0
0.3.0
0.4.0
0.5.0
0.6.0
0.7.0
0.8.0
0.9.0
1.*
1.0.0
1.1.0
1.10.0
1.10.1
1.10.10
1.10.2
1.10.3
1.10.4
1.10.5
1.10.6
1.10.7
1.10.8
1.10.9
1.2.0
1.3.0
1.4.0
1.5.0
1.6.1
1.7.0
1.8.1
1.9.0
1.9.1
1.9.10
1.9.11
1.9.2
1.9.3
1.9.4
1.9.5
1.9.6
1.9.7
1.9.8
1.9.9
2.*
2.0.0
2.0.1
2.0.10
2.0.11
2.0.12
2.0.13
2.0.14
2.0.15
2.0.16
2.0.17
2.0.18
2.0.2
2.0.3
2.0.4
2.0.5
2.0.6
2.0.7
2.0.8
2.0.9
2.1.0
2.1.1
2.1.10
2.1.11
2.1.12
2.1.13
2.1.14
2.1.2
2.1.3
2.1.4
2.1.5
2.1.6
2.1.7
2.1.8
2.1.9
2.2.0
2.2.1
2.2.2
2.2.3

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-50131.json"