CVE-2026-25541
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.
EPSS 0.02% · 5.6th percentile
Risk Scores
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| tokio-rs | bytes | 1.2.1, *, >= 1.2.1, < 1.11.1 |
| crates.io | bytes | 1.2.1, 1.2.1 |
| Salesforce | flow |
Timeline
- Feb 3, 2026 CVE Published
- Feb 3, 2026 PoC Published
- Feb 5, 2026 EPSS Score
- Feb 5, 2026 CVE Updated
- Feb 7, 2026 EPSS Score
- Feb 7, 2026 Security Advisory
- Feb 9, 2026 EPSS Score
- Feb 12, 2026 EPSS Score
- Feb 14, 2026 EPSS Score
- Feb 16, 2026 EPSS Score
- Feb 18, 2026 EPSS Score
- Feb 20, 2026 EPSS Score
References
- https://github.com/tokio-rs/bytes/security/advisories/GHSA-434x-w66g-qw3r url
- https://github.com/tokio-rs/bytes/commit/d0293b0e35838123c51ca5dfdf468ecafee4398f url
- https://github.com/tokio-rs/bytes/releases/tag/v1.11.1 url
- https://rustsec.org/advisories/RUSTSEC-2026-0007.html url
- https://nvd.nist.gov/vuln/detail/CVE-2026-25541 advisory
- https://github.com/tokio-rs/bytes package
- https://advisory.splunk.com/advisories/SVD-2026-0512 advisory
- https://advisory.splunk.com/advisories/SVD-2026-0513 advisory
- https://advisory.splunk.com/advisories/SVD-2026-0509 advisory
- https://advisory.splunk.com/advisories/SVD-2026-0510 advisory
- https://advisory.splunk.com/advisories/SVD-2026-0505 advisory
- https://advisory.splunk.com/advisories/SVD-2026-0515 advisory
- https://advisory.splunk.com/advisories/SVD-2026-0507 advisory
- https://advisory.splunk.com/advisories/SVD-2026-0506 advisory
- https://advisory.splunk.com/advisories/SVD-2026-0508 advisory
- https://advisory.splunk.com/advisories/SVD-2026-0504 advisory
- https://advisory.splunk.com/advisories/SVD-2026-0514 advisory
- https://advisory.splunk.com/advisories/SVD-2026-0516 advisory
- https://advisory.splunk.com/advisories/SVD-2026-0501 advisory
- https://advisory.splunk.com/advisories/SVD-2026-0503 advisory
…and 2 more