VulnerabilityPublished 18 Jul 2025Updated 4 Nov 2026

CVE-2025-53901: Rust wasmtime · Wasmtime is a runtime for WebAssembly

Affects rust-wasmtimeSource GCVE Database

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Authoritative record:CVE-2025-53901· Low 3.5

Not known to be exploited · CVSS 3.5 Low.

Data as of 5 Nov 2026, 00:01 UTC

CVSS 3.1 base score

3.5Low

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.3% chance of exploitation in 30 days – higher than 32% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L

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

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: Low: The attacker is authorized with (i.e., requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.
User Interaction: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: Low: Performance is reduced or there are interruptions in resource availability. Even if repeated exploitation of the vulnerability is possible, the attacker does not have the ability to completely deny service to legitimate users. The resources in the impacted component are either partially available all of the time, or fully available only some of the time, but overall there is no direct, serious consequence to the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 18 Jul 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 4 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
Ubuntu 26.10rust-wasmtime`pkg:deb/ubuntu/rust-wasmtime?arch=source&distro=stonking`Other threats	Affected =36.0.5+dfsg-1 =36.0.13+dfsg-1	Fixed in–
Ubuntu 25.10rust-wasmtime`pkg:deb/ubuntu/rust-wasmtime?arch=source&distro=questing`Other threats	Affected =26.0.1+dfsg-3	Fixed in–
Ubuntu 24.04 LTSrust-wasmtime`pkg:deb/ubuntu/rust-wasmtime?arch=source&distro=noble`Other threats	Affected 10.0.1+dfsg-7 – 16.0.0+dfsg-3 4 affected builds	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Users should upgrade to Wasmtime versions 24.0.4, 33.0.2, or 34.0.2 or later to resolve this issue. There is no workaround for affected embeddings that provide guests with the ability to open multiple file descriptors. Embedders using WASIp2 or components, or those not allowing guest file descriptor creation, are not affected and do not require action.

Description

A bug in Wasmtime's WASIp1 implementation can cause a panic in the host runtime when a WebAssembly guest calls fd_renumber with certain arguments followed by path_open. This leads to a denial-of-service condition but does not cause memory corruption or sandbox escape. The issue affects Wasmtime versions prior to 24.0.4, 33.0.2, and 34.0.2 and requires the guest to have access to open multiple file descriptors, typically via a preopened directory. No workaround exists other than updating to a patched version.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 4 Nov 2026, 21:52 UTC

Technical details

References

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