CVE-2026-115387 json
Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 Host Panic via WASI Filesystem Timestamp Overflow
published 2026-09-24 46 d ago modified 2026-11-04 5 d ago also EUVD-2026-108316 , GHSA-j2g9-4prp-pf6h , RUSTSEC-2026-0314
- cvss
- 6.2
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.1%
- EPSS 0.1% chance of exploitation in 30 days, percentile 1%
- public exploits
- 0
- none known
Summary
Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 contains a denial of service vulnerability in wasmtime-wasi that allows guest WASI programs to panic the host via overflowing filesystem timestamps. Attackers can pass atim or mtim values whose sub-second field overflows the seconds field to path_filestat_set_times, fd_filestat_set_times, set-times, or set-times-at, crashing the host.
Patch / fix
- crates.io wasmtime-wasi 36.0.16, 48.0.3, 49.0.1
- bytecodealliance wasmtime 36.0.16, 48.0.3, 49.0.1
- rust-wasmtime Debian 14 36.0.20+dfsg-1
debian advisories DEBIAN-CVE-2026-115387
- github.com/bytecodealliance/wasmtime#14403 pull request
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 5 d ago
Exploit prediction
0.11% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 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 |
| CNA | 3.1 | 6.2 | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| CNA | 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 |
| OSV | 3.1 | 6.2 | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| crates.io | wasmtime-wasi | >=0.0.0-0, <36.0.16 >=37.0.0, <48.0.3 >=49.0.0, <49.0.1 |
36.0.16 48.0.3 49.0.1 |
Affected products
- bytecodealliance wasmtime
Classification
- Weakness
-
- CWE-190 Integer Overflow or Wraparound
References
-
github.com
/bytecodealliance/wasmtime/pull/14403
web
-
github.com
/bytecodealliance/wasmtime/security/advisories/GHSA-j2g9-4prp-pf6h
vendor-advisory
-
vulncheck.com
/advisories/wasmtime-before-36.0.16-37.0.0-before-48.0.3-and-49.0.0-before-49.0.1-host-panic-via-wasi-filesyst
third-party-advisory
-
crates.io
/crates/wasmtime-wasi
package
-
rustsec.org
/advisories/RUSTSEC-2026-0314.html
advisory
Sources
- CVE List CVE-2026-115387
- NVD CVE-2026-115387
- OSV RUSTSEC-2026-0314
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.