CVE-2018-5178

critical
Published — · Modified —
CVSS v3
CVSS v2
VIR risk
9.5

Description

A buffer overflow was found during UTF8 to Unicode string conversion within JavaScript with extremely large amounts of data. This vulnerability requires the use of a malicious or vulnerable legacy extension in order to occur. This vulnerability affects Thunderbird ESR < 52.8, Thunderbird < 52.8, and Firefox ESR < 52.8.

Predictions

Exploit likelihood
20%
Patch ETA

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2018-5178

vendor Authored 2026-05-27

Vendor advisory: arch — https://security.archlinux.org/ASA-201805-21

OS impact

OSVersionStatusFixed in
arch archfixed52.8.0-1
debian debianbookwormfixed52.8.0esr-1
debian debianbullseyefixed52.8.0esr-1
debian debianforkyfixed52.8.0esr-1
debian debiansidfixed52.8.0esr-1
debian debiantrixiefixed52.8.0esr-1

References

Verify integrity in audit chain (admin only). AS-IS.