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CVE-2026-5735General(mozilla / firefox)

LOWCVSS 9.8 · 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

Memory safety bugs present in Firefox 149.0.1 and Thunderbird 149.0.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 149.0.2 and Thunderbird 149.0.2.

mozilla CVEsBack to dashboard
0.0/ 10 priority

Sources & remediation

Vendor / third-party advisories
Other references
Weakness type (CWE)
CWE-787CWE-125

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

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

  • 2 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • General: 1 classified signal
  • Disclosure: 1 classified signal
  • Peaked 1d ago at 1 mentions (2026-04-07); latest day: 1
  • 2 total mentions across 2 days

Affected systems

Vendors
mozilla
Products
firefoxthunderbird

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-04-07: 1Mentions · 2026-04-19: 104-0704-19
Signal classification2 categories
General
150.0%
Disclosure
150.0%
Referenced assets2 URLs
Classification over time
DateTotalLabels
2026-04-071
General1
2026-04-191
Disclosure1
Full discourse2 posts
  • CVE@CVEnew
    Disclosure

    CVE-2026-5735 Memory safety bugs present in Firefox 149.0.1 and Thunderbird 149.0.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort so… https://www.cve.org/CVERecord?id=CVE-2026-5735

    Post summary

    A new memory safety vulnerability (CVE-2026-5735) affecting Firefox 149.0.1 and Thunderbird 149.0.1 has been announced, noting evidence of memory corruption but providing no further technical details, PoC, or exploitation evidence.

    00000195
    57.2K followersView on X
  • Vulmon Vulnerability Feed@VulmonFeeds
    General

    CVE-2026-5735 Memory Safety Bugs in Firefox and Thunderbird 149.0.1 https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-5735

    Post summary

    The post references CVE-2026-5735 affecting Firefox and Thunderbird 149.0.1 but provides no additional information on exploitation, patching, or technical details.

    0000054
    4.0K followersView on X
CPE platform detail2 entries

2 of 2 entries

PartVendorProductVersionTarget SWTarget HW
Appmozillafirefox---
Appmozillathunderbird---

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