Mozilla Firefox up to 149.0.1 Text integer overflow

CVSS Meta Temp Score
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CTI Interest Score
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7.4$5k-$25k0.00

Summaryinfo

A vulnerability was found in Mozilla Firefox up to 149.0.1 and classified as critical. This issue affects some unknown processing of the component Text Component. Executing a manipulation can lead to integer overflow. The identification of this vulnerability is CVE-2026-5732. The attack may be launched remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Mozilla Firefox up to 149.0.1. This vulnerability affects an unknown code of the component Text Component. The manipulation with an unknown input leads to a integer overflow vulnerability. The CWE definition for the vulnerability is CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Incorrect boundary conditions, integer overflow in the Graphics: Text component. This vulnerability was fixed in Firefox 149.0.2, Firefox ESR 140.9.1, Thunderbird 149.0.2, and Thunderbird 140.9.1.

The advisory is shared for download at bugzilla.mozilla.org. This vulnerability was named CVE-2026-5732 since 04/07/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 07/02/2026).

The vulnerability scanner Nessus provides a plugin with the ID 306064 (RHEL 9 : firefox (RHSA-2026:7671)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 149.0.2 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (306064) and CERT Bund (WID-SEC-2026-0997). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • SUSE Linux
  • Oracle Linux
  • IGEL OS
  • SUSE openSUSE
  • RESF Rocky Linux
  • Mozilla Firefox
  • Mozilla Firefox ESR
  • Mozilla Thunderbird

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.6
VulDB Meta Temp Score: 7.4

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

ADP CISA Base Score: 8.8
ADP CISA Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Integer overflow
CWE: CWE-190 / CWE-189
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 306064
Nessus Name: RHEL 9 : firefox (RHSA-2026:7671)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Firefox 149.0.2

Timelineinfo

04/07/2026 Advisory disclosed
04/07/2026 +0 days CVE reserved
04/07/2026 +0 days VulDB entry created
07/02/2026 +86 days VulDB entry last update

Sourcesinfo

Vendor: mozilla.org
Product: mozilla.org

Advisory: bugzilla.mozilla.org
Status: Confirmed

CVE: CVE-2026-5732 (🔒)
GCVE (CVE): GCVE-0-2026-5732
GCVE (VulDB): GCVE-100-355744
CERT Bund: WID-SEC-2026-0997 - Mozilla Firefox und Thunderbird: Mehrere Schwachstellen

Entryinfo

Created: 04/07/2026 15:31
Updated: 07/02/2026 04:06
Changes: 04/07/2026 15:31 (55), 04/08/2026 13:12 (7), 04/13/2026 16:13 (2), 04/14/2026 17:11 (1), 04/18/2026 19:51 (1), 04/29/2026 05:10 (1), 05/02/2026 03:06 (1), 07/02/2026 04:06 (12)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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