CVE-2026-93471

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Source
https://cve.org/CVERecord?id=CVE-2026-93471
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-93471.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-93471
Aliases
Published
2026-10-22T06:59:24Z
Modified
2026-10-24T02:48:01Z
Severity
  • 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
Unbounded SAML message decompression in esaml allows memory exhaustion
Details

Improper Handling of Highly Compressed Data (Data Amplification) in esaml_binding in dropbox esaml allows an unauthenticated attacker to exhaust server memory and crash the Erlang VM via a crafted compressed SAMLResponse.

esaml_binding:decode_response/2 base64-decodes the attacker-supplied SAMLResponse, inflates it with zlib:unzip/1 with no bound on the output, then converts the result to a charlist with binary_to_list/1 before parsing. This runs on the SAML consume (ACS) and single-logout endpoints, which accept unauthenticated requests by design, and it runs before any signature check. A small deflate stream reaches a compression ratio near 1000 to 1, so a request body of tens of kilobytes inflates to hundreds of megabytes and then to several gigabytes of list heap, so a few requests exhaust memory and take the node down.

This issue affects esaml: from 0.1.0 onward.

Database specific 
{
    "cna_assigner": "EEF",
    "cwe_ids": [
        "CWE-409"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93471.json",
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "range": [
                        {
                            "introduced": "deeb84378d5c82153b470e99d24f77c38afca14a"
                        },
                        {
                            "fixed": "*"
                        },
                        {
                            "introduced": "deeb84378d5c82153b470e99d24f77c38afca14a"
                        },
                        {
                            "fixed": "*"
                        },
                        {
                            "introduced": "0.1.0"
                        },
                        {
                            "fixed": "*"
                        },
                        {
                            "introduced": "deeb84378d5c82153b470e99d24f77c38afca14a"
                        },
                        {
                            "fixed": "*"
                        }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                }
            ]
        }
    ]
}
References

Affected packages

Git / github.com/arekinath/esaml

Affected ranges

Type
GIT
Repo
https://github.com/arekinath/esaml
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
deeb84378d5c82153b470e99d24f77c38afca14a
Database specific
Show details 
{
    "extracted_events": [
        {
            "range": [
                {
                    "fixed": "deeb84378d5c82153b470e99d24f77c38afca14a"
                }
            ],
            "source": "REFERENCES_COMMIT"
        }
    ]
}
Type
GIT
Repo
https://github.com/handnot2/esaml
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
deeb84378d5c82153b470e99d24f77c38afca14a
Database specific
Show details 
{
    "extracted_events": [
        {
            "range": [
                {
                    "fixed": "deeb84378d5c82153b470e99d24f77c38afca14a"
                }
            ],
            "source": "REFERENCES_COMMIT"
        }
    ]
}

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-93471.json"