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01 Record

CVE-2026-49422

Use-after-free in TCP RACK stack option handler

HighPUBLISHEDCNA: freebsd
CNA base score8.4 CVSS v3.xCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

02 Description

Use-after-free in TCP RACK stack option handler

03 Exploitation and scoring

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
0.16% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 5.9% of scored records. A rank, not a probability.
NVD base score
8.4 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD analysis status
Analyzed. NVD last modified this record on 2026-09-01.
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.

04 Metadata

Published
2026-08-19 05:28Z2 MO AGO
Last updated
2026-08-20 03:55Z2 MO AGO
Reserved
2026-05-29
Assigning CNA
freebsd
Record state
PUBLISHED
Severity
High (CVSS 8.4)
CNA CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses
Data version
5.2
Document digest
ed6f76a58fe289df31739fbc5479c6eb9ac4505507592812be64dc88b6841445

05 Affected products

VendorProductVersionsPlatforms
FreeBSDFreeBSD15.1-RELEASE to < p1, 15.0-RELEASE to < p11, 14.4-RELEASE to < p7, 14.3-RELEASE to < p16—

06 References