VulnSocial

CVE-2026-84639Disclosure(mozilla / thunderbird)

LOWCVSS 9.1 · CRITICAL

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

Triggering an error condition in certain MIME bodies would cause uninitialized memory to be used. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

mozilla CVEsBack to dashboard
0.0/ 10 priority

Sources & remediation

Vendor / third-party advisories
Other references
Weakness type (CWE)
CWE-457

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • thunderbird

Threat summary

  • 1 mentions across 1 observed day

What's happening

  • Technical details provided in 1 signal
  • Disclosure: 1 classified signal
  • 1 total mentions across 1 day

Affected systems

Vendors
mozilla
Products
thunderbird

Deep dive

Activity timeline1 mentions / 1d
00111Mentions · 2026-09-10: 1Technical Details · 2026-09-10: 109-10
Signal classification1 categories
Disclosure
1100.0%
Referenced assets1 URL
Full discourse1 post
  • Cybersecurity News DE@cybsecuritynews
    Disclosure

    #schwachstellen CVE-2026-84639: Thunderbird-Fehler führt zu uninitialisiertem Speicher #cve202684639 #mozillathunderbird https://cybersecurity-news.de/cve-2026-84639-thunderbird-uninitialisierter-speicher

    Post summary

    A new Thunderbird vulnerability (CVE-2026-84639) has been disclosed, noted for causing uninitialized memory usage.

    0000034
    12 followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Appmozillathunderbird---

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