What’s Vulnerable › Vulnerabilities

CVE-2025-5264: Potential local code execution in “Copy as cURL” command

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-05-27 · updated 2026-10-05
• Weakness: CWE-77

Description

Due to insufficient escaping of the newline character in the “Copy as cURL” feature, an attacker could trick a user into using this command, potentially leading to local code execution on the user's system. This vulnerability was fixed in Firefox 139, Firefox ESR 115.24, Firefox ESR 128.11, Thunderbird 139, and Thunderbird 128.11.

Affected products

• Mozilla Firefox: before 115.24.0; before 139.0; from 116.0 before 128.11.0 — fixed in 115.24.0, 128.11.0, 139.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 115.24.0, 128.11.0, 139.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1950001
• https://www.mozilla.org/security/advisories/mfsa2025-42/
• https://www.mozilla.org/security/advisories/mfsa2025-43/
• https://www.mozilla.org/security/advisories/mfsa2025-44/
• https://www.mozilla.org/security/advisories/mfsa2025-45/
• https://www.mozilla.org/security/advisories/mfsa2025-46/
• https://lists.debian.org/debian-lts-announce/2025/05/msg00043.html
• https://lists.debian.org/debian-lts-announce/2025/05/msg00046.html

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