WebAssembly v1.0.29 discovered to contain an abort in CWriter::MangleType.

published 2023-03-10 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-30900

cvss: 5.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 21%
public exploits: 0; none known

Patch / fix

distros 1

wabt Debian 14, Debian 13 1.0.33-1

debian advisories DEBIAN-CVE-2023-27116

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-27116 updated 2025-11-21 cvss 5.5

webassembly: an abort in CWriter::MangleType.

Red Hat All currently supported Red Hat products
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: partial
Assessed: 20 mo ago (2025-02-28)

Exploit prediction

0.29% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/WebAssembly/wabt/issues/1984 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	5.5	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References

github.com /WebAssembly/wabt/issues/1984
exploit, issue-tracking
lists.fedoraproject.org /archives/list/package-announce%40lists.fedoraproject.org/message/OSFFCKXUQ5PAC5UVXY7N6HEHVQ3AC2RG/
vendor-advisory

Sources

CVE List CVE-2023-27116
NVD CVE-2023-27116

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