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Vulnerabilities / CVE-2026-84142

critical

CVE-2026-84142

firefox: thunderbird: Internally found bugs fixed in Firefox 155

Published Modified CWE 119, 200
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Red Hat6.1CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Trivy's own label is CRITICAL. Rated critical by NVD. Rated lower by Red Hat (medium), Ubuntu (medium).

Description

Internally found bugs present in Thunderbird 154. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155 and Thunderbird 155.

Affected packages and fixed versions

SourcePackageFixed in
chainguardfirefox155.0.1-r0
rapidfort alpine 3.20firefox, thunderbirdno fix listed
rapidfort alpine 3.21firefox, thunderbirdno fix listed
rapidfort alpine 3.22firefox, thunderbirdno fix listed
rapidfort alpine 3.23firefox, thunderbirdno fix listed
rapidfort alpine 3.24firefox, thunderbirdno fix listed
rapidfort fedora 43thunderbird, thunderbird-librnp-rnp156.0-2.fc43
rapidfort ubuntu 20.04thunderbirdno fix listed
rapidfort ubuntu 22.04thunderbirdno fix listed
rapidfort ubuntu 24.04thunderbirdno fix listed
ubuntu 22.04thunderbirdno fix listed
wolfifirefox155.0.1-r0
Show all 18 entries from 12 sources
SourcePackageFixed in
chainguardfirefox155.0.1-r0
rapidfort alpine 3.20firefoxno fix listed
rapidfort alpine 3.20thunderbirdno fix listed
rapidfort alpine 3.21firefoxno fix listed
rapidfort alpine 3.21thunderbirdno fix listed
rapidfort alpine 3.22firefoxno fix listed
rapidfort alpine 3.22thunderbirdno fix listed
rapidfort alpine 3.23firefoxno fix listed
rapidfort alpine 3.23thunderbirdno fix listed
rapidfort alpine 3.24firefoxno fix listed
rapidfort alpine 3.24thunderbirdno fix listed
rapidfort fedora 43thunderbird156.0-2.fc43
rapidfort fedora 43thunderbird-librnp-rnp156.0-2.fc43
rapidfort ubuntu 20.04thunderbirdno fix listed
rapidfort ubuntu 22.04thunderbirdno fix listed
rapidfort ubuntu 24.04thunderbirdno fix listed
ubuntu 22.04thunderbirdno fix listed
wolfifirefox155.0.1-r0

References

All 10 references

Vulnerability data compiled from the Trivy vulnerability database (trivy-db, Aqua Security, Apache License 2.0), which aggregates third-party advisories. CVE records are published by The MITRE Corporation under the CVE Terms of Use; CVE is a trademark of MITRE. This product uses data from the NVD API but is not endorsed or certified by the NVD. Severity, titles and advisory data from the GitHub Advisory Database (CC BY 4.0), Red Hat security data (CC BY 4.0) and the other sources linked on each entry. Entries may be summarised or re-formatted; the linked original is the authoritative record.