Medium 4.8Published Oct 28, 2026

CVE-2026-103392Session Smart Router: A SACK option causes out-of-bounds memory access and TCP payload corruption when TCP sequence stitching is enabled

Updated under an hour ago (Oct 29, 2026, 8:40 PM ET)

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It affects Juniper Networks Session Smart Router. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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An Out-of-Bounds Write vulnerability in the TCP header processing in Juniper Networks Session Smart Router allows an attacker to corrupt TCP payload data and potentially cause session desynchronization via a transit TCP packet with an oversized SACK option length.

CVSS: 4.8 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
Weakness (CWE): CWE-787
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: juniper
NVD analysis: Awaiting Analysis
Record last updated: Oct 28, 2026
First seen by InfoSec Signals: Oct 28, 2026

Affected products

Affected products

Juniper Networks Session Smart Router juniper_networks:session_smart_router (from the name)	before 7.0.5; from 7.1.0 before 7.1.7; from 7.2.0 before 7.2.3	CNA record

References

References

https://supportportal.juniper.net/JSA112183	vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.