RUSTSEC-2026-0499

See a problem?
Please try reporting it to the source first.

Source

https://rustsec.org/advisories/RUSTSEC-2026-0499

Import Source

https://github.com/rustsec/advisory-db/blob/osv/crates/RUSTSEC-2026-0499.json

JSON Data

https://api.osv.dev/v1/vulns/RUSTSEC-2026-0499

Aliases

GHSA-9c8r-76f3-m426

Published

2026-11-11T12:00:00Z

Modified

2026-11-12T08:00:03Z

Severity

5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N CVSS Calculator

Summary

Signature::from_der reads a signature with bytes after it, a wrong sequence length or an unneeded zero as the signature

Details

Signature::from_der read a DER-encoded ECDSA signature leniently. It read as the signature: the signature followed by other bytes; a sequence length shorter than its contents, or longer with bytes after them (a length byte with its high bit set among them); and an R or S preceded by a zero byte it did not need. It read a lone-zero R or S as zero.

messages::verify, compat::bsm::verify_message_der, auth::Certificate::verify, auth::VerifiableCertificate::verify, wallet::ProtoWallet::verify_signature and kvstore::KVStoreInterpreter::verify_signature read through it, and each verified such a form of a valid signature. Given one signature a key holder made, anyone could produce other byte strings that verify as that signature over the same data. No form verifies over other data: an application that acts on the verdict alone is not affected; one that compares, hashes or stores a signature's bytes is.

0.8.6 refuses each form as Error::InvalidSignature. A signature's bytes are still not unique after the patch: the same signature with S replaced by n - S verifies, so an application that keys on the bytes also requires Signature::is_low_s().

Database specific

{
    "license": "CC0-1.0"
}

References

Affected packages

crates.io / bsv-rs

Package

Name: bsv-rs; View open source insights on deps.dev
Purl: pkg:cargo/bsv-rs

Affected ranges

Type: SEMVER
Events: Introduced

0.0.0-0

Fixed

0.8.6

Introduced

0.9.0-beta.1

Fixed

0.9.0-beta.7.0

Ecosystem specific

{
    "affected_functions": null,
    "affects": {
        "arch": [],
        "functions": [
            "bsv_rs::auth::Certificate::verify",
            "bsv_rs::auth::VerifiableCertificate::verify",
            "bsv_rs::auth::utils::validate_certificate_encoding",
            "bsv_rs::compat::bsm::verify_message_der",
            "bsv_rs::kvstore::KVStoreInterpreter::verify_signature",
            "bsv_rs::messages::verify",
            "bsv_rs::primitives::bsv::TransactionSignature::from_checksig_format",
            "bsv_rs::primitives::ec::Signature::from_der",
            "bsv_rs::wallet::ProtoWallet::verify_signature"
        ],
        "os": []
    }
}