{"cve":"CVE-2026-25541","nvd":{"published":"2026-02-04T22:16:00.383","modified":"2026-06-17T10:24:49.410","status":"Analyzed","description":"Bytes is a utility library for working with bytes. From version 1.2.1 to before 1.11.1, Bytes is vulnerable to integer overflow in BytesMut::reserve. In the unique reclaim path of BytesMut::reserve, if the condition \"v_capacity >= new_cap + offset\" uses 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. This behavior is observable in release builds (integer overflow wraps), whereas debug builds panic due to overflow checks. This issue has been patched in version 1.11.1.","cvss_v4":{"vector":"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","score":5.5},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-680"],"references":["https://github.com/tokio-rs/bytes/commit/d0293b0e35838123c51ca5dfdf468ecafee4398f","https://github.com/tokio-rs/bytes/releases/tag/v1.11.1","https://github.com/tokio-rs/bytes/security/advisories/GHSA-434x-w66g-qw3r","https://rustsec.org/advisories/RUSTSEC-2026-0007.html"],"products":["tokio-rs:bytes"],"source":"nvd","synced_at":"2026-10-19T22:22:27.261130201+00:00"},"epss":{"cve":"CVE-2026-25541","score":0.00601,"percentile":0.48782,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-434x-w66g-qw3r","url":"https://osv.dev/vulnerability/GHSA-434x-w66g-qw3r","summary":"bytes has integer overflow in BytesMut::reserve","modified":"2026-09-10T03:50:33.995841351Z","packages":[{"ecosystem":"crates.io","name":"bytes","purl":"pkg:cargo/bytes","ranges":[">=1.2.1 <1.11.1"],"fixed":["1.11.1"]}]},{"id":"RUSTSEC-2026-0007","url":"https://osv.dev/vulnerability/RUSTSEC-2026-0007","summary":"Integer overflow in `BytesMut::reserve`","modified":"2026-10-12T18:00:09.239418978Z","packages":[{"ecosystem":"crates.io","name":"bytes","purl":"pkg:cargo/bytes","ranges":[">=1.2.1 <1.11.1"],"fixed":["1.11.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}