🛡️ CVE-2025-8027 on Ubuntu — mozjs102

⚪ Unknown ✅ No Known Exploit OSV

N/A

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

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. This vulnerability was fixed in Firefox 141, Firefox ESR 115.26, Firefox ESR 128.13, Firefox ESR 140.1, Thunderbird 141, Thunderbird 128.13, and Thunderbird 140.1.

Distribution advisory

This page covers CVE-2025-8027 as tracked by Ubuntu, for the package mozjs102. The fix is available in version 1:140.7.1+build1-0ubuntu0.22.04.1; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity none, availability none.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Attack vector: Network — reachable from anywhere that can route to the service.
Attack complexity: Low — the attack works reliably, with no preparation.
Privileges required: None — an unauthenticated stranger can try it.
User interaction: Required — someone has to click, open or visit something.
Scope: Unchanged — the damage stays inside the vulnerable component.
Confidentiality impact: High — total loss, or loss the attacker controls.
Integrity impact: None.
Availability impact: None.

Weakness class

UBUNTU-CVE-2025-8027 is classified as CWE-457: Use of Uninitialized Variable. The code uses a variable that has not been initialized, leading to unpredictable or unintended results.

Affected software

UBUNTU-CVE-2025-8027 is recorded against 8 packages.

mozjs102
mozjs115
mozjs38
mozjs52
mozjs68
mozjs78
mozjs91
thunderbird (fixed in 1:140.7.1+build1-0ubuntu0.22.04.1)

Timeline and source

Published on 22 July 2025 and last revised on 29 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

ubuntu.com (Report)
www.cve.org (Report)
www.mozilla.org (Report)
www.mozilla.org (Report)
www.mozilla.org (Report)
bugzilla.mozilla.org (Report)
www.mozilla.org (Report)
www.mozilla.org (Report)
www.mozilla.org (Report)
www.mozilla.org (Report)
www.mozilla.org (Report)
www.mozilla.org (Report)
www.mozilla.org (Report)
ubuntu.com (Advisory)

Same weakness in other software

These advisories are the same class of weakness (CWE-457: Use of Uninitialized Variable) in other software:

CVE-2026-19160 (3.1 Low, published 6 Aug 2026)
CVE-2026-19146 (5.3 Medium, published 6 Aug 2026)
CVE-2026-19161 (3.1 Low, published 6 Aug 2026)
CVE-2026-17668 (6.5 Medium, published 30 Jul 2026)
CVE-2026-17759 (6.5 Medium, published 30 Jul 2026)
CVE-2026-17858 (4.3 Medium, published 30 Jul 2026)
CVE-2026-17667 (6.5 Medium, published 30 Jul 2026)
CVE-2026-17757 (4.3 Medium, published 30 Jul 2026)

CVE-2025-8027 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Base record — CVE-2025-8027 Debian — DEBIAN-CVE-2025-8027

Details

Severity Unknown

CVSS Score N/A

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

CWE N/A

Public Exploit ✅ No

Source OSV

Published 2025-07-22

Updated 2026-08-20

Modified 2026-07-29

Fix URL N/A

Affected Packages

Software	From version	Fixed in
mozjs102	—	—
mozjs115	—	—
mozjs38	—	—
mozjs52	—	—
mozjs68	—	—
mozjs78	—	—
mozjs91	—	—
thunderbird	—	1:140.7.1+build1-0ubuntu0.22.04.1

References

REPORT https://ubuntu.com/security/CVE-2025-8027

REPORT https://www.cve.org/CVERecord?id=CVE-2025-8027

REPORT https://www.mozilla.org/en-US/security/advisories/mfsa2025-56/#CVE-2025-8027

REPORT https://www.mozilla.org/en-US/security/advisories/mfsa2025-58/#CVE-2025-8027

REPORT https://www.mozilla.org/en-US/security/advisories/mfsa2025-62/#CVE-2025-8027

REPORT https://bugzilla.mozilla.org/show_bug.cgi?id=1968423

REPORT https://www.mozilla.org/security/advisories/mfsa2025-56/

REPORT https://www.mozilla.org/security/advisories/mfsa2025-57/

REPORT https://www.mozilla.org/security/advisories/mfsa2025-58/

REPORT https://www.mozilla.org/security/advisories/mfsa2025-59/

REPORT https://www.mozilla.org/security/advisories/mfsa2025-61/

REPORT https://www.mozilla.org/security/advisories/mfsa2025-62/

REPORT https://www.mozilla.org/security/advisories/mfsa2025-63/

ADVISORY https://ubuntu.com/security/notices/USN-7991-1

🔗 NVD 🔗 Mitre

Similar Threats

Vulnerability Monitoring

Track new vulnerabilities in mozjs102

UBUNTU-CVE-2025-8027 is rated CVSS 6.5 Medium. BotEraser monitors your WordPress installation and notifies you when software you use appears in our vulnerability database.

Set Up Free Alerts →

No credit card required · Results in minutes

ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

🛡️ CVE-2025-8027 on Ubuntu — mozjs102

Description

Distribution advisory

How this vulnerability can be exploited

CVSS metrics in full

Weakness class

Affected software

Timeline and source

References

Same weakness in other software

CVE-2025-8027 on other distributions

Track new vulnerabilities in mozjs102

Browse related advisories

Company

Resources

Services

Trusted

Subscribe