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CVE-2026-12291— Use-after-free in the Networking: HTTP component

Quick assessment

Affected
Mozilla Firefox
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mozilla Firefox是Mozilla基金会开源的一款Web浏览器。 Mozilla Firefox存在资源管理错误漏洞，该漏洞源于Networking: HTTP组件存在释放后重用问题，可能导致远程攻击者在用户交互下执行任意代码。以下版本受到影响：Firefox 152之前版本、Firefox ESR 140.12之前版本、Firefox ESR 115.37之前版本、Thunderbird 152之前版本和Thunderbird 140.12之前版本。

AI Predicted 8.6 Difficulty: Easy EPSS 0.38% · P30

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 5

VendorProduct Version RangeStatus
Mozilla Firefox 115.37≤ 115.* unaffected
140.12≤ 140.* unaffected
152≤ * unaffected
Mozilla Thunderbird 140.12≤ 140.* unaffected
152≤ * unaffected
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I. Basic Information for CVE-2026-12291

Vulnerability Information
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Vulnerability Title
Use-after-free in the Networking: HTTP component
Source: CVE Program / CVE List V5
Vulnerability Description
Use-after-free in the Networking: HTTP component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Mozilla Firefox 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Firefox是Mozilla基金会开源的一款Web浏览器。 Mozilla Firefox存在资源管理错误漏洞，该漏洞源于Networking: HTTP组件存在释放后重用问题，可能导致远程攻击者在用户交互下执行任意代码。以下版本受到影响：Firefox 152之前版本、Firefox ESR 140.12之前版本、Firefox ESR 115.37之前版本、Thunderbird 152之前版本和Thunderbird 140.12之前版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Mozilla Firefox 115.37 ~ 115.* -
Mozilla Thunderbird 140.12 ~ 140.* -

II. Public POCs for CVE-2026-12291

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III. Intelligence Information for CVE-2026-12291

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Vendor Advisories for CVE-2026-12291 (6)

Same Patch Batch · Mozilla · 2026-06-16 · 44 CVEs total

CVE-2026-12301 Memory safety bug fixed in Firefox 152
CVE-2026-12298 Memory safety bug fixed in Firefox 152
CVE-2026-12299 JIT miscompilation in the DOM: Core & HTML component
CVE-2026-12297 Sandbox escape due to incorrect boundary conditions in the Networking component
CVE-2026-12294 Sandbox escape in the DOM: Workers component
CVE-2026-12293 Use-after-free in the Graphics: WebGPU component
CVE-2026-12292 Incorrect boundary conditions in the Web Audio component
CVE-2026-12290 Memory safety bug fixed in Firefox 152
CVE-2026-12289 Privilege escalation in the Graphics: WebRender component
CVE-2026-12295 Sandbox escape in the DOM: Navigation component
CVE-2026-12300 Memory safety bug fixed in Firefox 152
CVE-2026-12302 Mitigation bypass in the DOM: Security component
CVE-2026-12303 Information disclosure due to incorrect boundary conditions in the Graphics: WebGPU compon
CVE-2026-12304 Same-origin policy bypass in the Networking: Cookies component
CVE-2026-12305 Memory safety bug fixed in Firefox 152
CVE-2026-12306 Memory safety bug fixed in Firefox 152
CVE-2026-12307 Memory safety bug fixed in Firefox 152
CVE-2026-12308 Memory safety bug fixed in Firefox 152
CVE-2026-12309 Memory safety bug fixed in Firefox 152
CVE-2026-12310 Memory safety bug fixed in Firefox 152

Showing top 20 of 44 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2026-12291

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