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Fencer Vulns
high 8.4

CVE-2024-27529 json

wasm3 uncontrolled memory allocation vulnerability

published 2024-11-08 2 y ago modified 2026-09-10 59 d ago also EUVD-2024-3246 , GHSA-fmq6-4w57-2w3v , PYSEC-2024-305

cvss
8.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 18%
public exploits
0
none known

Summary

wasm3 139076a contains memory leaks in Read_utf8.

Patch / fix

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
total
Assessed
23 mo ago

Exploit prediction

0.26% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/wasm3/wasm3/issues/462 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 8.4 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GitHub 3.1 8.4 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 8.4 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
OSV 3.1 8.4 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
swift github.com/shareup/wasm-interpreter-apple
<=0.8.1
 no fix listed
pypi pywasm3
<=0.5.0
<=139076a
 no fix listed
crates.io wasm3
<=0.3.1
 no fix listed

Affected products

  • wasm3_project wasm3

Classification

Weakness
  • CWE-125 Out-of-bounds Read
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

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.