NVD - CVE-2026-25541 (original) (raw)
CVE-2026-25541 Detail
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.
Metrics
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CVSS 4.0 Severity and Vector Strings:
NIST: NVD
N/A
NVD assessment not yet provided.
CNA: GitHub, Inc.
CVSS-BT 5.5 MEDIUM
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
CVSS 3.x Severity and Vector Strings:
NIST: NVD
Base Score: 7.5 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0 Severity and Vector Strings:
NIST: NVD
Base Score: N/A
NVD assessment not yet provided.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/tokio-rs/bytes/commit/d0293b0e35838123c51ca5dfdf468ecafee4398f | GitHub, Inc. | Patch |
| https://github.com/tokio-rs/bytes/releases/tag/v1.11.1 | GitHub, Inc. | Product Release Notes |
| https://github.com/tokio-rs/bytes/security/advisories/GHSA-434x-w66g-qw3r | GitHub, Inc. | Exploit Vendor Advisory |
| https://rustsec.org/advisories/RUSTSEC-2026-0007.html | GitHub, Inc. | Exploit Third Party Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-680 | Integer Overflow to Buffer Overflow | GitHub, Inc. |
Known Affected Software Configurations Switch to CPE 2.2
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Change History
2 change records found show changes
Initial Analysis by NIST 2/27/2026 3:13:28 PM
| Action | Type | Old Value | New Value |
|---|---|---|---|
| Added | CVSS V3.1 | AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | |
| Added | CPE Configuration | OR *cpe:2.3:a:tokio-rs:bytes:*:*:*:*:*:rust:*:* versions from (including) 1.2.1 up to (excluding) 1.11.1 | |
| Added | Reference Type | GitHub, Inc.: https://github.com/tokio-rs/bytes/commit/d0293b0e35838123c51ca5dfdf468ecafee4398f Types: Patch | |
| Added | Reference Type | GitHub, Inc.: https://github.com/tokio-rs/bytes/releases/tag/v1.11.1 Types: Product, Release Notes | |
| Added | Reference Type | GitHub, Inc.: https://github.com/tokio-rs/bytes/security/advisories/GHSA-434x-w66g-qw3r Types: Exploit, Vendor Advisory | |
| Added | Reference Type | GitHub, Inc.: https://rustsec.org/advisories/RUSTSEC-2026-0007.html Types: Exploit, Third Party Advisory |
New CVE Received from GitHub, Inc. 2/04/2026 5:16:00 PM
| Action | Type | Old Value | New Value |
|---|---|---|---|
| Added | 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. | |
| Added | CVSS V4.0 | AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X | |
| Added | CWE | CWE-680 | |
| Added | Reference | https://github.com/tokio-rs/bytes/commit/d0293b0e35838123c51ca5dfdf468ecafee4398f | |
| Added | Reference | https://github.com/tokio-rs/bytes/releases/tag/v1.11.1 | |
| Added | Reference | https://github.com/tokio-rs/bytes/security/advisories/GHSA-434x-w66g-qw3r | |
| Added | Reference | https://rustsec.org/advisories/RUSTSEC-2026-0007.html |
Quick Info
CVE Dictionary Entry:
CVE-2026-25541
NVD Published Date:
02/04/2026
NVD Last Modified:
02/27/2026
Source:
GitHub, Inc.