Integer Overflow to Buffer Overflow Affecting wasmcloud package, versions <1.9.2-r1


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.01% (2nd percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-WASMCLOUD-15317375
  • published19 Feb 2026
  • disclosed4 Feb 2026

Introduced: 4 Feb 2026

CVE-2026-25541  (opens in a new tab)
CWE-680  (opens in a new tab)

How to fix?

Upgrade Chainguard wasmcloud to version 1.9.2-r1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream wasmcloud package and not the wasmcloud package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

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 Base Scores

version 3.1