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CVE-2026-25541

7.5 · HIGH

Bytes is a utility library for working with bytes.

Published Feb 4, 2026CWE-680EPSS 0.61%

Overview

CVE-2026-25541 is a high-severity vulnerability. It was published on February 4, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/tokio-rs/bytes/commit/d0293b0e35838123c51ca5dfdf468ecafee4398fGitHubgithub.com/tokio-rs/bytes/releases/tag/v1.11.1GitHubgithub.com/tokio-rs/bytes/security/advisories/GHSA-434x-w66g-qw3rRefrustsec.org/advisories/RUSTSEC-2026-0007.html

How CyberStrike helps

Frequently asked questions

What is CVE-2026-25541?

CVE-2026-25541 is a high-severity vulnerability. It was published on February 4, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-25541?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-25541?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-25541?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-25541 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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