CVE-2026-91839

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.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpacttotalSuccessful exploitation gives total 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

0.20% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 10.3% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

Deferred. NVD last modified this record on 2026-09-30.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

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

2026-09-25 17:56Z1 MO AGO

Last updated

2026-09-28 12:44Z1 MO AGO

Reserved

2026-09-15

Assigning CNA

fedora

Record state

PUBLISHED

Severity

High (CVSS 7.8)

CNA CVSS vector

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

Weaknesses

• CWE-93Improper Neutralization of CRLF Sequences ('CRLF Injection')Base

Data version

5.2

Document digest

3081c11c9e7fefc8bf87a82083cedba1e8f7c94e6b469662767bf68002b2ea42

• access.redhat.comhttps://access.redhat.com/security/cve/CVE-2026-91839vdb-entryx_refsource_REDHAT
• bugzilla.redhat.comRHBZ#2533640https://bugzilla.redhat.com/show_bug.cgi?id=2533640issue-trackingx_refsource_REDHAT
• gitlab.gnome.orghttps://gitlab.gnome.org/Archive/NetworkManager-fortisslvpn/-/work_items/80