CVE-2026-63435

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

0.44% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 38.6% of scored records. A rank, not a probability.

NVD base score

5.3 (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:U/C:N/I:L/A:N

NVD analysis status

Deferred. NVD last modified this record on 2026-09-09.

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

2026-09-01 20:09Z1 MO AGO

Last updated

2026-09-02 15:44Z1 MO AGO

Reserved

2026-07-16

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

Medium (CVSS 5.3)

CNA CVSS vector

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

Weaknesses

• CWE-436Interpretation ConflictClass
• CWE-1286Improper Validation of Syntactic Correctness of InputBase

Data version

5.2

Document digest

f486a7c90b71b1cbce3df16331f97c59122dc9d94fb743afdf1cecea8477143b

• github.comhttps://github.com/mikel/mail/security/advisories/GHSA-mvxr-6m87-mv2qx_refsource_CONFIRM
• github.comhttps://github.com/mikel/mail/pull/1664x_refsource_MISC
• github.comhttps://github.com/mikel/mail/commit/f9d59c2e447af42e2c3dec5a56b1bb25c7292859x_refsource_MISC
• github.comhttps://github.com/mikel/mail/releases/tag/2.9.1x_refsource_MISC