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Bytes CVE-2026-25541

HIGH
Integer Overflow to Buffer Overflow (CWE-680)
2026-02-04 security-advisories@github.com GHSA-434x-w66g-qw3r
Integer Overflow Bytes Suse
7.5
CVSS 3.1 · GitHub Advisory
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Craft input triggering BytesMut::reserve
  2. Delivery
    Trigger integer overflow in addition
  3. Exploit
    Corrupt internal capacity value
  4. Execution
    Create out-of-bounds slice access
  5. Impact
    Trigger undefined behavior crash

Vulnerability Assessment

Weakness
CWE
CWE-680
OWASP Top 10:2025
A06:2021 - Vulnerable and Outdated Components
ASVS 5.0
V15 - Secure Coding and Architecture Integer-to-buffer conversion safety
Exploitation Conditions

Application must use Bytes library versions 1.2.1 to 1.11.0 with BytesMut::reserve API called in release builds. No authentication required; remote exploitation possible if application accepts untrusted input controlling buffer allocation sizes.
Impact

CVSS 7.5 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: None. User interaction: None. Public exploit/POC available.
Exploit ScenarioDerived

An attacker could exploit this vulnerability to compromise the affected system.
This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Integer overflow in the Bytes library versions 1.2.1 through 1.11.0 allows attackers to corrupt the BytesMut capacity value, leading to out-of-bounds memory access and undefined behavior in release builds. Public exploit code exists for this vulnerability, affecting applications that depend on Bytes for buffer management. A patch is available in version 1.11.1.

Earlier versions of this analysis (1)
v1 Mar 12, 2026 - 21:54 CVSS 7.5

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. [CVSS 7.5 HIGH]

RemediationAI

A vendor patch is available — apply it immediately. Fixed in version 1.11.1.. Restrict network access to the affected service where possible.

Affected Packages

cargo bytes fix: 1.11.1

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in cargo

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

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Technical ContextAI · show details

Affects Bytes. 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() th

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Severity by source

GitHub Advisory PRIMARY 7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SUSE HIGH

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

3
PoC Detected
Feb 27, 2026 - 20:13 vuln.today
Public exploit code
Patch released
Feb 27, 2026 - 20:13 nvd
Patch available
CVE Published
Feb 04, 2026 - 22:16 nvd
HIGH 7.5

DescriptionGitHub Advisory

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.

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 51 cargo packages depend on bytes (7 direct, 45 indirect)

Ecosystem-wide dependent count for version 1.2.1.

Executive ViewAI

Why It Matters

CVE-2026-25541 is a high-severity integer overflow vulnerability in the Bytes library (versions 1.2.1-1.11.0) that could allow attackers to cause denial of service or potentially execute arbitrary code in applications using affected versions. Organizations using Rust applications or dependencies relying on vulnerable Bytes versions face immediate risk of service disruption and data integrity compromise.

Business Impact: High
Compensating Controls

Apply vendor patch.

Threat Intelligence Overview

EPSS Score
0.0%
Top 98% exploitable
Exploit
POC
Public exploit code exists
Data Quality
4 sources
Confidence: Medium
NVD CVE.org EPSS Vendor GitHub VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC Yes
EPSS 0.0%
Patch available Yes
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Out-of-Cycle
Exploitation· derived
Poc
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact
High

Priority Score

58
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +38
PoC: +20
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Integer Overflow MEDIUM

Integer overflow occurs when an arithmetic operation produces a result that exceeds the maximum value a given integer type can store.

Affected Products (CPE)GitHub Advisory

cpe:2.3:a:tokio-rs:bytes:*:*:*:*:*:rust:*:*

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Micro 5.3 Fixed
SUSE Linux Enterprise Micro 5.4 Fixed
SUSE Linux Enterprise Micro 5.5 Fixed
SUSE Linux Micro 6.2 Fixed
SUSE Package Hub 15 SP7 Fixed

References

Advisories & patches
PATCH https://github.com/tokio-rs/bytes/commit/d0293b0e35838123c51ca5dfdf468ecafee4398f ADVISORY https://vuldb.com/vuln/344448 ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:22787/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:2975/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:2976/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:2977/ REF https://github.com/tokio-rs/bytes/releases/tag/v1.11.1

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