CVE-2026-12312Disclosure(mozilla / firefox)

LOWCVSS 7.5 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Patch mozilla firefox systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

Memory safety bug fixed in Thunderbird 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.

0.5/ 10 priority

Sources & remediation

Weakness type (CWE)
CWE-119

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

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

  • firefox
  • thunderbird

Threat summary

  • Patch or workaround signal is available
  • 2 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 1 signal
  • Disclosure: 2 classified signals
  • Peaked 1d ago at 1 mentions (2026-06-16); latest day: 1
  • 2 total mentions across 2 days

Affected systems

Vendors
Products
firefoxthunderbird

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-06-16: 1Mentions · 2026-06-19: 1Patch / Workaround · 2026-06-16: 1Technical Details · 2026-06-16: 106-1606-19
Signal classification1 categories
Disclosure
2100.0%
Referenced assets3 URLs
Full discourse2 posts
  • 新月@fubukiyokiyoki
    Disclosure

    Firefoxに脆弱性を報告してCVE-2026-12312が採番されました! 全然Memory関係ないロジックバグなのにMemory safety bugと書いてあり謎 これ以外にもいっぱい報告しているのでお楽しみに https://www.mozilla.org/en-US/security/advisories/mfsa2026-57/#CVE-2026-12312

    Post summary

    A new CVE, CVE-2026-12312, has been assigned to a logic bug in Firefox that is incorrectly labeled as a memory safety issue, with no PoC, exploit, or patch detailed in the announcement.

    11001111114.3K
    3.2K followersView on X
  • Vulmon Vulnerability Feed@VulmonFeeds
    Disclosure

    CVE-2026-12312 Memory Safety Bug Fixed in Firefox 152 and Firefox ESR 140.12 https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-12312 Vulnerability Notification: https://alerts.vulmon.com/?utm_source=twitter&utm_medium=social&utm_campaign=2102281&utm_content=3

    Post summary

    CVE-2026-12312 is a memory safety bug in Firefox that has been fixed in recent versions; the post provides the vulnerability details and a patch reference but no exploit or PoC.

    0000033
    4.0K followersView on X
CPE platform detail4 entries

4 of 4 entries

PartVendorProductVersionTarget SWTarget HW
Appmozillafirefox---
Appmozillafirefox---
Appmozillathunderbird---
Appmozillathunderbird---

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