CVE-2026-39983

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• 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

2.19% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 80.8% 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:U/C:L/I:H/A:L

NVD analysis status

Modified. NVD last modified this record on 2026-07-15.

Red Hat severity

Important. 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

2026-04-09 17:05Z4 MO AGO

Last updated

2026-07-15 01:01Z1 MO AGO

Reserved

2026-04-08

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

High (CVSS 8.6)

CNA CVSS vector

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

Weaknesses

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

Data version

5.2

Document digest

ee964a7582576d28ba506a4035f2be0d161e2146b3041288cf64e4d7cdbeff75

• github.comhttps://github.com/patrickjuchli/basic-ftp/security/advisories/GHSA-chqc-8p9q-pq6qx_refsource_CONFIRM
• github.comhttps://github.com/patrickjuchli/basic-ftp/commit/2ecc8e2c500c5234115f06fd1dbde1aa03d70f4bx_refsource_MISC
• github.comhttps://github.com/patrickjuchli/basic-ftp/releases/tag/v5.2.1x_refsource_MISC
• access.redhat.comhttps://access.redhat.com/security/cve/CVE-2026-39983vdb-entryx_refsource_REDHAT
• bugzilla.redhat.comRHBZ#2456971https://bugzilla.redhat.com/show_bug.cgi?id=2456971issue-trackingx_refsource_REDHAT
• security.access.redhat.comhttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39983.jsonx_sadp-csaf-vex
• access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:9742vendor-advisoryx_refsource_REDHAT
• access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:13826vendor-advisoryx_refsource_REDHAT