CVE-2026-6757

MEDIUM
Published Apr 21, 2026 Modified Apr 22, 2026 CWE-824

Description

Invalid pointer in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

CVSS v3.1 Score

6.3
MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L

EPSS — Exploit Prediction

0.0004
Probability of exploitation
0.12%
Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-824 CWE-824

Affected Products

Vendor Product
mozilla firefox
mozilla firefox
mozilla thunderbird

References

Frequently Asked Questions

What is CVE-2026-6757? +
Invalid pointer in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10. It has a CVSS v3.1 base score of 6.3 (MEDIUM).
How severe is CVE-2026-6757? +
CVE-2026-6757 has a CVSS v3.1 score of 6.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0004, placing it in the 0th percentile for exploitation probability.
What products are affected by CVE-2026-6757? +
CVE-2026-6757 affects products from mozilla, specifically: firefox, thunderbird. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2026-6757? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2025-14739

Access of Uninitialized Pointer vulnerability in TP-Link WR940N and WR941ND allows local unauthenticated attackers the ability to execute DoS attack …
CVE-2025-66588 9.8

In AzeoTech DAQFactory release 20.7 (Build 2555), an Access of Uninitialized Pointer vulnerability can be exploited by an attacker which …
CVE-2025-32451 8.8

A memory corruption vulnerability exists in Foxit Reader 2025.1.0.27937 due to the use of an uninitialized pointer. A specially crafted …
CVE-2023-43531 8.4

Memory corruption while verifying the serialized header when the key pairs are generated.
CVE-2026-44411 7.8

A vulnerability has been identified in Solid Edge SE2026 (All versions < V226.0 Update 5). The affected application is vulnerable …
CVE-2024-57943 7.8

In the Linux kernel, the following vulnerability has been resolved: exfat: fix the new buffer was not zeroed before writing …

Don't wait for an exploit

Scan your website for vulnerabilities like CVE-2026-6757 — free, no signup required.

Start Free Scan