CVE-2026-41509

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Source
https://cve.org/CVERecord?id=CVE-2026-41509
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-41509.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-41509
Aliases
  • GHSA-w72c-hgx8-p7cv
Published
2026-05-08T13:47:17Z
Modified
2026-08-12T16:24:15Z
Severity
  • 6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N CVSS Calculator
Summary
Integer underflow in crypto_sign_open() leads to buffer overflow
Details

CROSS implementation contains reference and optimized implementations of the CROSS post-quantum signature algorithm. Prior to commit fc6b7e7, there is a buffer overflow in crypto_sign_open() caused by an underflow of the integer mlen. This issue has been patched via commit fc6b7e7.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-121",
        "CWE-122"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41509.json",
    "unresolved_ranges":  [
        {
            "extracted_events":  [
                {
                    "fixed":  "fc6b7e78cdf789bb5c395a81dc601356f1383da0"
                }
            ],
            "source":  "AFFECTED_FIELD"
        }
    ]
}
References

Affected packages

Git / github.com/cross-signature/cross-implementation

Affected ranges

Type
GIT
Repo
https://github.com/cross-signature/cross-implementation
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
fc6b7e78cdf789bb5c395a81dc601356f1383da0
Database specific
Show details 
{
    "source":  "REFERENCES"
}

Affected versions

v1.*
v1.0
v1.1
v1.2
v2.*
v2.0
v2.2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-41509.json"
vanir_signatures 
[
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "70770750323307666825992158497714364052",
            "length":  501
        },
        "id":  "CVE-2026-41509-d144b327",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/cross-signature/cross-implementation/commit/fc6b7e78cdf789bb5c395a81dc601356f1383da0",
        "target":  {
            "file":  "Reference_Implementation/lib/sign.c",
            "function":  "crypto_sign_open"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "7598353314488829133350743937367453244",
                "195212271278767656618856783880887399843",
                "242035960181669813962725551078743282154"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2026-41509-ea2a24cb",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/cross-signature/cross-implementation/commit/fc6b7e78cdf789bb5c395a81dc601356f1383da0",
        "target":  {
            "file":  "Reference_Implementation/lib/sign.c"
        }
    }
]
vanir_signatures_modified 
"2026-08-12T16:24:15Z"