CVE-2025-8027: JavaScript engine only wrote partial return value to stack
On 64-bit platforms IonMonkey-JIT only wrote 32 bits of the 64-bit return value space on the stack. Baseline-JIT, however, read the entire 64 bits.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 115.26 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 128.13 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 140.1 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 141 - Upgrade
Upgrade
Mozilla Firefoxto a version that resolves this vulnerability.Fixed in 141 - Upgrade
Upgrade
Mozilla Firefox ESRto a version that resolves this vulnerability.Fixed in 115.26 - Upgrade
Upgrade
Mozilla Firefox ESRto a version that resolves this vulnerability.Fixed in 128.13 - Upgrade
Upgrade
Mozilla Firefox ESRto a version that resolves this vulnerability.Fixed in 140.1 - Upgrade
Upgrade
Mozilla Thunderbirdto a version that resolves this vulnerability.Fixed in 141 - Upgrade
Upgrade
Mozilla Thunderbirdto a version that resolves this vulnerability.Fixed in 128.13 - Upgrade
Upgrade
Mozilla Thunderbirdto a version that resolves this vulnerability.Fixed in 140.1
Event History
Parent advisories
This vulnerability appears in the following advisories.
Peer vulnerabilities
Found alongside the following vulnerabilities.
Frequently Asked Questions
What is the severity of CVE-2025-8027?
CVE-2025-8027 has a high severity rating due to potential exploitation leading to execution of arbitrary code.
How do I fix CVE-2025-8027?
To fix CVE-2025-8027, update your Mozilla Firefox to the latest version beyond the affected versions, which include Firefox ESR 115.26 and others.
What products are affected by CVE-2025-8027?
CVE-2025-8027 affects Mozilla Firefox and Firefox ESR versions up to 115.26, 141, 128.13, and 140.1.
What is the nature of CVE-2025-8027 vulnerability?
CVE-2025-8027 is a vulnerability related to IonMonkey-JIT and Baseline-JIT handling of 64-bit return values on 64-bit platforms.
Is there a workaround for CVE-2025-8027?
There is no known workaround for CVE-2025-8027, so updating to a fixed version is the recommended mitigation.