CVE-2026-8958

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.34% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 27.3% of scored records. A rank, not a probability.

NVD base score

8.6 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Analyzed. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-05-19 12:29Z3 MO AGO

Last updated

2026-05-19 17:10Z3 MO AGO

Reserved

2026-05-19

Assigning CNA

mozilla

Record state

PUBLISHED

Severity

High (CVSS 8.6)

CNA CVSS vector

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

Weaknesses

• CWE-668Exposure of Resource to Wrong SphereClass
• CWE-693Protection Mechanism FailurePillar
• CWE-403Exposure of File Descriptor to Unintended Control Sphere ('File Descriptor Leak')Base

Data version

5.2

Document digest

db8775a7abeb340b2acd812c335739acbc1de6faf21c6fadaaf3a3cf7fc867a3

• bugzilla.mozilla.orghttps://bugzilla.mozilla.org/show_bug.cgi?id=2034713
• www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-46/
• www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-48/
• www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-50/
• www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-51/