pywasm3 has an Invalid Memory Read, Leading to DoS and Potential Code Execution

published 2024-11-08 2 y ago modified 2026-06-17 4 mo ago also GHSA-mhg9-mm8c-c683 , PYSEC-2024-304 , EUVD-2024-24724

cvss: 8.4; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 14%
public exploits: 0; none known

wasm3 139076a suffers from Invalid Memory Read, leading to DoS and potential Code Execution.

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: total
Assessed: 23 mo ago (2024-11-18)

Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 14% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/wasm3/wasm3/issues/463 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
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
GitHub	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
pypi	pywasm3	<=0.5.0 <=139076a	no fix listed

Affected products

wasm3_project wasm3

Classification

Weakness

CWE-125 Out-of-bounds Read

References

github.com /wasm3/wasm3/issues/463
web, exploit, issue-tracking, report
gist.github.com /haruki3hhh/baa757c4af4fefb410d9c74d7a68152e
web, third-party-advisory, advisory
nvd.nist.gov /vuln/detail/CVE-2024-27528
advisory
github.com /pypa/advisory-database/tree/main/vulns/pywasm3/PYSEC-2024-304.yaml
web
github.com /wasm3/pywasm3
package
github.com /wasm3/pywasm3/blob/main/wasm3/m3_exec.h
web
github.com /advisories/GHSA-mhg9-mm8c-c683
advisory

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.

Summary