RUSTSEC-2026-0314 CVE-2026-115387 GHSA-j2g9-4prp-pf6h
Guest can panic host through filesystem datetime overflow
- Severity
- 6.9 / 10
- Medium · CVSS 4.0
- Exploit chance (EPSS)
- 0.11%
- Chance of exploitation in the next 30 days. Higher than 1.37% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-190 Integer Overflow or Wraparound
- Fix
49.0.1- Upgrade wasmtime-wasi to this version or later
Description
This is an entry in the RustSec database for the Wasmtime security advisory located at https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-j2g9-4prp-pf6h For more information see the GitHub-hosted security advisory.
Affected versions
crates.io
| Package | Vulnerable | Fixed in |
|---|---|---|
| wasmtime-wasi | >= 0.0.0-0, < 36.0.16>= 37.0.0, < 48.0.3>= 49.0.0, < 49.0.1 |
36.0.1648.0.349.0.1 |
How to fix
Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.
wasmtime-wasi crates.io → 49.0.1
- cargo
cargo update -p wasmtime-wasi --precise 49.0.1
Severity breakdown
CVSS 4.0 6.9
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:X/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
- Attack vector
- Local
- Attack complexity
- Low
- Attack requirements
- None
- Privileges required
- None
- User interaction
- None
- Confidentiality (vulnerable system)
- None
- Integrity (vulnerable system)
- None
- Availability (vulnerable system)
- High
- Confidentiality (subsequent systems)
- None
- Integrity (subsequent systems)
- None
- Availability (subsequent systems)
- None
- Exploit maturity
- Not defined
- Scope
- X
CVSS 3.1 6.2
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Weakness
CWE-190: Integer Overflow or Wraparound
The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
How to prevent it
- Requirements: Ensure that all protocols are strictly defined, such that all out-of-bounds behavior can be identified simply, and require strict conformance to the protocol.
- Requirements: Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. If possible, choose a language or compiler that performs automatic bounds checking.
- Architecture and Design: Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid [REF-1482]. Use libraries or frameworks that make it easier to handle numbers without unexpected consequences. Examples include safe integer handling packages such as SafeInt (C++) or IntegerLib (C or C++). [REF-106]
- Implementation: Perform input validation on any numeric input by ensuring that it is within the expected range. Enforce that the input meets both the minimum and maximum requirements for the expected range. Use unsigned integers where possible. This makes it easier to perform validation for integer overflows. When signed integers are required, ensure that the range check includes minimum values as well as maximum values.
- Implementation: Understand the programming language's underlying representation and how it interacts with numeric calculation (CWE-681). Pay close attention to byte size discrepancies, precision, signed/unsigned distinctions, truncation, conversion and casting between types, "not-a-number" calculations, and how the language handles numbers that are too large or too small for its underlying representation. [REF-7] Also be careful to account for 32-bit, 64-bit, and other potential differences that may affect the numeric representation.
- Architecture and Design: For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.
- Implementation: Examine compiler warnings closely and eliminate problems with potential security implications, such as signed / unsigned mismatch in memory operations, or use of uninitialized variables. Even if the weakness is rarely exploitable, a single failure may lead to the compromise of the entire system.
References
Advisories
Packages
Other links
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| RUSTSEC-2026-0420 wasip3 UDP `send` can deliver a datagram to an address only allowed for receiving | Medium | Also affects wasmtime-wasi |
| RUSTSEC-2026-0352 Filesystem sandbox escape when renaming symlinks with trailing slashes | Not rated yet | Also affects wasmtime-wasi |
| RUSTSEC-2026-0324 Guest can panic host through filesystem timestamp before the epoch on wasip3 | Medium | Also affects wasmtime-wasi |
| RUSTSEC-2026-0321 WASI preview 0 implementation of `poll_oneoff` circumvents fuel consumption | Medium | Also affects wasmtime-wasi |
| RUSTSEC-2026-0323 fd_readdir copies uninitialized struct padding into guest memory | Low | Also affects wasmtime-wasi |
| RUSTSEC-2026-0322 Excessive allocated memory on the host when guests don't have stdio | Medium | Also affects wasmtime-wasi |
| GHSA-4ch3-9j33-3pmj Wasmtime: WASI hard links bypass wasmtime-wasi's FilePerms for destination | Medium | Also affects wasmtime-wasi |
| GHSA-3p27-qvp9-27qf Wasmtime has a leak in WASIp1 `fd_renumber` implementation | Medium | Also affects wasmtime-wasi |
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