Mozilla Firefox up to 115.35.1/140.10.1 Playback memory corruption

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.9$5k-$25k0.00

Summaryinfo

A vulnerability classified as critical has been found in Mozilla Firefox up to 115.35.1/140.10.1. Affected by this issue is some unknown functionality of the component Playback Component. Performing a manipulation results in memory corruption. This vulnerability is reported as CVE-2026-8091. The attack is possible to be carried out remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Mozilla Firefox up to 115.35.1/140.10.1. This affects some unknown processing of the component Playback Component. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, Thunderbird 140.10.1, and Firefox ESR 115.35.2.

The advisory is shared at bugzilla.mozilla.org. This vulnerability is uniquely identified as CVE-2026-8091 since 05/07/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 07/02/2026).

The vulnerability scanner Nessus provides a plugin with the ID 313177 (Linux Distros Unpatched Vulnerability : CVE-2026-8091), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 115.35.2 or 140.10.2 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (313177) and CERT Bund (WID-SEC-2026-1427). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

  • Mozilla Firefox
  • Mozilla Firefox ESR

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.0
VulDB Meta Temp Score: 7.9

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

ADP CISA Base Score: 9.8
ADP CISA Vector: 🔒

CVSSv2info

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

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
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: 313177
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-8091

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Firefox 115.35.2/140.10.2

Timelineinfo

05/07/2026 Advisory disclosed
05/07/2026 +0 days CVE reserved
05/07/2026 +0 days VulDB entry created
07/02/2026 +56 days VulDB entry last update

Sourcesinfo

Vendor: mozilla.org
Product: mozilla.org

Advisory: bugzilla.mozilla.org
Status: Confirmed

CVE: CVE-2026-8091 (🔒)
GCVE (CVE): GCVE-0-2026-8091
GCVE (VulDB): GCVE-100-361857
CERT Bund: WID-SEC-2026-1427 - Mozilla Firefox und Firefox ESR: Mehrere Schwachstellen

Entryinfo

Created: 05/07/2026 15:22
Updated: 07/02/2026 19:00
Changes: 05/07/2026 15:22 (56), 05/08/2026 19:28 (2), 05/09/2026 09:40 (7), 07/02/2026 19:00 (12)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion

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