CVE-2026-105963

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Source
https://cve.org/CVERecord?id=CVE-2026-105963
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-105963.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-105963
Aliases
Published
2026-10-23T09:56:58Z
Modified
2026-10-25T02:45:25Z
Severity
  • 5.1 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N CVSS Calculator
Summary
Secret key base exposed in stack trace arguments on wrong-typed Plug.Crypto arguments
Details

Externally-Generated Error Message Containing Sensitive Information vulnerability in plug_crypto in elixir-plug plug_crypto allows an unauthenticated remote attacker to expose the secret key base through application logs via a wrong-typed argument. Every public function in Plug.Crypto validates argument types in a function-head guard. A failed guard makes the Erlang VM raise FunctionClauseError with the actual argument values in the top stack frame, so the secret key base, a derived key, or the value an API key is compared against lands in that frame. The library's rescue blocks and Plug.Crypto.prune_args_from_stacktrace/1 only reach exceptions raised inside a function body, so they never see a guard failure. Plug.Cowboy and Bandit write the frame to the error log and attach it as crash_reason Logger metadata, which error trackers forward.

Two entry points take request data. Plug.Crypto.verify/4 exposes the secret key base when the token is neither a binary nor nil, which Phoenix.Token.verify/4 reaches because it forwards the token unguarded. Plug.Crypto.secure_compare/2 exposes the other operand when one side is not a binary, as happens when a missing request header yields nil. Reading the leaked value needs separate access to the logs or the error tracker, so the request alone does not disclose the secret to the attacker.

This issue affects plug: from 1.6.3 before 1.7.0; plug_crypto: from 1.0.0 before 2.2.1.

Database specific 
{
    "cna_assigner": "EEF",
    "cwe_ids": [
        "CWE-532"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/105xxx/CVE-2026-105963.json",
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "range": [
                        {
                            "introduced": "1.6.3"
                        },
                        {
                            "fixed": "1.7.0"
                        },
                        {
                            "introduced": "56000c33d8a0a2fbac491f8be06b9c5112bc2276"
                        },
                        {
                            "fixed": "*"
                        }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                }
            ]
        }
    ]
}
References

Affected packages

Git / github.com/elixir-plug/plug

Affected ranges

Type
GIT
Repo
https://github.com/elixir-plug/plug
Events
Introduced
8dba025cf47831a4ef9b1abe7c8b03ffaf555af5
Fixed
23f0187e9babffce4981764a5c1bc5732df652a1
Fixed
56000c33d8a0a2fbac491f8be06b9c5112bc2276
Fixed
aeaa90e76b73ea90c3ecca9aae16fce71bd2a8d4
Database specific
Show details 
{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "1.6.3"
                },
                {
                    "fixed": "1.7.0"
                }
            ],
            "source": "DESCRIPTION"
        },
        {
            "range": [
                {
                    "fixed": "56000c33d8a0a2fbac491f8be06b9c5112bc2276"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "range": [
                {
                    "fixed": "aeaa90e76b73ea90c3ecca9aae16fce71bd2a8d4"
                }
            ],
            "source": "REFERENCES_COMMIT"
        }
    ]
}
Type
GIT
Repo
https://github.com/elixir-plug/plug_crypto
Events
Introduced
2d078b7b8264c565f0ff71235c515f4f46882dcf
Fixed
981887493dada0fce7003c61861c00dfbb0fc8c5
Introduced
a3162119fc8fe519772b74760ead4a89e7709925
Fixed
9b36a120e1f43b80113f2efededcbfb79c3cd46c
Fixed
2d078b7b8264c565f0ff71235c515f4f46882dcf
Database specific
Show details 
{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "2d078b7b8264c565f0ff71235c515f4f46882dcf"
                },
                {
                    "fixed": "981887493dada0fce7003c61861c00dfbb0fc8c5"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandardRange"
        },
        {
            "range": [
                {
                    "introduced": "1.0.0"
                },
                {
                    "fixed": "2.2.1"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandardRange"
        },
        {
            "range": [
                {
                    "fixed": "2d078b7b8264c565f0ff71235c515f4f46882dcf"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "range": [
                {
                    "fixed": "981887493dada0fce7003c61861c00dfbb0fc8c5"
                }
            ],
            "source": "REFERENCES_COMMIT"
        }
    ]
}

Affected versions

v1.*
v1.0.0
v1.1.0
v1.1.1
v1.1.2
v1.2.0
v1.2.1
v1.2.2
v1.2.4
v1.2.5
v2.*
v2.0.0
v2.1.0
v2.1.1
v2.2.0

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-105963.json"