CVE-2026-2779Disclosure(mozilla / firefox)

LOWCVSS 9.8 · CRITICAL

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

Incorrect boundary conditions in the Networking: JAR component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

mozilla CVEs Back to dashboard

0.5/ 10 priority

Sources & remediation

Vendor / third-party advisories

Other references

https://bugzilla.mozilla.org/show_bug.cgi?id=1164141

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
4 mentions across 3 observed days
Momentum state: stable

What's happening

Patch or workaround mentioned in 1 signal
Technical details provided in 4 signals
Disclosure: 3 classified signals
Peaked 2d ago at 2 mentions (2026-02-25); latest day: 1
4 total mentions across 3 days

Affected systems

Vendors

mozilla

Products

firefoxthunderbird

Deep dive

Activity timeline4 mentions / 3d

Signal classification2 categories

Disclosure

375.0%

Patch

125.0%

Referenced assets3 URLs

By indicator

Classification over time

Date	Total	Labels

2026-02-25	2	Disclosure2
2026-03-01	1	Disclosure1
2026-04-16	1	Patch1

Full discourse4 posts

Giuseppe Paternicola@giuseppe_1337175d
Patch
🚨 CRITICAL: CVE-2026-2779 (CVSS 9.8) Incorrect boundary conditions in Firefox/Thunderbird JAR component. Network exploitable, no user interaction required. Patched in Firefox 148, ESR 140.8, Thunderbird 148/140.8. #CVE #PatchNow https://t.co/FiuXkKY4DR
Post summary
The tweet announces CVE-2026-2779 as a critical vulnerability (CVSS 9.8) in Firefox/Thunderbird’s JAR component, notes it is network‑exploitable without user interaction, and states that patches are available in the latest releases.
0000041
25 followersView on X
CRAC Learning - Tech@cracbot221d
Disclosure
CVE-2026-2779 (CVSS:9.8, CRITICAL) is Modified. Incorrect boundary conditions in the Networking: JAR component. This vulnerability affects Firefox < 148, Firefox ESR < ..https://nvd.nist.gov/vuln/detail/CVE-2026-2779 #cybersecurityawareness #cybersecurity #CVE #infosec #hacker #nvd #mitre
Post summary
The post announces CVE-2026-2779, a critical boundary‑condition vulnerability in Firefox’s JAR component affecting versions below 148, with no PoC, exploit, or patch details provided.
0000031
173 followersView on X
Infoflowcloud@infoflowcloud225d
Disclosure
🚨*CVE* CVE-2026-2779 Incorrect boundary conditions in the Networking: JAR component. This vulnerability affects Firefox < 148 and Firefox ESR < 140.8. https://www.cve.org/CVERecord?id=CVE-2026-2779 ----- Traducción: CVE-2026-2779 Condiciones de límite incorrectas en el comp… http://infoflow.cloud`
Post summary
A new CVE (CVE-2026-2779) affecting Firefox versions is disclosed, detailing boundary condition issues in the Networking: JAR component, with affected version ranges specified.
0000065
54 followersView on X
CVE@CVEnew225d
Disclosure
CVE-2026-2779 Incorrect boundary conditions in the Networking: JAR component. This vulnerability affects Firefox < 148 and Firefox ESR < 140.8. https://www.cve.org/CVERecord?id=CVE-2026-2779
Post summary
CVE-2026-2779 is a vulnerability involving incorrect boundary conditions in Firefox's Networking: JAR component, affecting versions below 148 and ESR below 140.8.
00000223
56.6K followersView on X

CPE platform detail4 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

4 of 4 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	mozilla	firefox	-	-	-
App	mozilla	firefox	-	-	-
App	mozilla	thunderbird	-	-	-
App	mozilla	thunderbird	-	-	-

Explore more

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What researchers are saying

CVE-2026-2779

Giuseppe Paternicola[verified]@giuseppe_1337Patch

The tweet announces CVE-2026-2779 as a critical vulnerability (CVSS 9.8) in Firefox/Thunderbird’s JAR component, notes it is network‑exploitable without user interaction, and states that patches are available in the latest releases.

CRAC Learning - Tech@cracbotDisclosure

The post announces CVE-2026-2779, a critical boundary‑condition vulnerability in Firefox’s JAR component affecting versions below 148, with no PoC, exploit, or patch details provided.

Infoflowcloud@infoflowcloudDisclosure

A new CVE (CVE-2026-2779) affecting Firefox versions is disclosed, detailing boundary condition issues in the Networking: JAR component, with affected version ranges specified.

CVE@CVEnewDisclosure

CVE-2026-2779 is a vulnerability involving incorrect boundary conditions in Firefox's Networking: JAR component, affecting versions below 148 and ESR below 140.8.