{"url":"http://public2.vulnerablecode.io/api/packages/196475?format=json","purl":"pkg:deb/debian/rust-bytes@1.2.1-1","type":"deb","namespace":"debian","name":"rust-bytes","version":"1.2.1-1","qualifiers":{},"subpath":"","is_vulnerable":true,"next_non_vulnerable_version":"1.11.1-1","latest_non_vulnerable_version":"1.11.1-1","affected_by_vulnerabilities":[{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/90591?format=json","vulnerability_id":"VCID-tz6x-7j4b-ubbg","summary":"bytes has integer overflow in BytesMut::reserve\n# Details\n\nIn the unique reclaim path of `BytesMut::reserve`, the condition\n```rs\nif v_capacity >= new_cap + offset\n```\nuses an unchecked addition. When `new_cap + offset` overflows `usize` in release builds, this condition may incorrectly pass, causing `self.cap` to be set to a value that exceeds the actual allocated capacity. Subsequent APIs such as `spare_capacity_mut()` then trust this corrupted `cap` value and may create out-of-bounds slices, leading to UB.\n\nThis behavior is observable in release builds (integer overflow wraps), whereas debug builds panic due to overflow checks.\n\n## PoC\n\n```rs\nuse bytes::*;\n\nfn main() {\n    let mut a = BytesMut::from(&b\"hello world\"[..]);\n    let mut b = a.split_off(5);\n\n    // Ensure b becomes the unique owner of the backing storage\n    drop(a);\n\n    // Trigger overflow in new_cap + offset inside reserve\n    b.reserve(usize::MAX - 6);\n\n    // This call relies on the corrupted cap and may cause UB & HBO\n    b.put_u8(b'h');\n}\n```\n\n# Workarounds\n\nUsers of `BytesMut::reserve` are only affected if integer overflow checks are configured to wrap. When integer overflow is configured to panic, this issue does not apply.\n\nThis vulnerability is also known as [RUSTSEC-2026-0007](https://rustsec.org/advisories/RUSTSEC-2026-0007.html).","references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2026-25541","reference_id":"","reference_type":"","scores":[{"value":"0.00019","scoring_system":"epss","scoring_elements":"0.05537","published_at":"2026-06-05T12:55:00Z"},{"value":"0.00023","scoring_system":"epss","scoring_elements":"0.06646","published_at":"2026-06-06T12:55:00Z"},{"value":"0.00023","scoring_system":"epss","scoring_elements":"0.06594","published_at":"2026-06-09T12:55:00Z"},{"value":"0.00023","scoring_system":"epss","scoring_elements":"0.06592","published_at":"2026-06-08T12:55:00Z"},{"value":"0.00023","scoring_system":"epss","scoring_elements":"0.06634","published_at":"2026-06-07T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-25541"},{"reference_url":"https://github.com/tokio-rs/bytes","reference_id":"","reference_type":"","scores":[{"value":"5.5","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/tokio-rs/bytes"},{"reference_url":"https://github.com/tokio-rs/bytes/commit/d0293b0e35838123c51ca5dfdf468ecafee4398f","reference_id":"","reference_type":"","scores":[{"value":"5.5","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2026-02-05T15:13:12Z/"}],"url":"https://github.com/tokio-rs/bytes/commit/d0293b0e35838123c51ca5dfdf468ecafee4398f"},{"reference_url":"https://github.com/tokio-rs/bytes/releases/tag/v1.11.1","reference_id":"","reference_type":"","scores":[{"value":"5.5","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2026-02-05T15:13:12Z/"}],"url":"https://github.com/tokio-rs/bytes/releases/tag/v1.11.1"},{"reference_url":"https://github.com/tokio-rs/bytes/security/advisories/GHSA-434x-w66g-qw3r","reference_id":"","reference_type":"","scores":[{"value":"MODERATE","scoring_system":"cvssv3.1_qr","scoring_elements":""},{"value":"5.5","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2026-02-05T15:13:12Z/"}],"url":"https://github.com/tokio-rs/bytes/security/advisories/GHSA-434x-w66g-qw3r"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2026-25541","reference_id":"","reference_type":"","scores":[{"value":"5.5","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-25541"},{"reference_url":"https://rustsec.org/advisories/RUSTSEC-2026-0007.html","reference_id":"","reference_type":"","scores":[{"value":"5.5","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2026-02-05T15:13:12Z/"}],"url":"https://rustsec.org/advisories/RUSTSEC-2026-0007.html"},{"reference_url":"https://github.com/advisories/GHSA-434x-w66g-qw3r","reference_id":"GHSA-434x-w66g-qw3r","reference_type":"","scores":[{"value":"MODERATE","scoring_system":"cvssv3.1_qr","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-434x-w66g-qw3r"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/196477?format=json","purl":"pkg:deb/debian/rust-bytes@1.11.1-1","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/rust-bytes@1.11.1-1"}],"aliases":["CVE-2026-25541","GHSA-434x-w66g-qw3r"],"risk_score":3.1,"exploitability":"0.5","weighted_severity":"6.2","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-tz6x-7j4b-ubbg"}],"fixing_vulnerabilities":[],"risk_score":"3.1","resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/rust-bytes@1.2.1-1"}