Back to CVE records
High 8.2Published Aug 26, 2026
CVE-2026-19538Bypass of BLOCKED ACL items on proxy protocol port over TCP or TLS
Updated under an hour ago ()
Does this affect you?
It affects NLnet Labs NSD and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Start free and add your stack
Free account, 1 product
The BLOCKED access control list items that are evaluated to deny access on the the proxy protocol port can be bypassed completely when connecting over TCP or TLS and sending the query twice on connection that is kept open.
- CVSS
- 8.2 HIGH (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- Weakness (CWE)
- CWE-290, CWE-672
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- NLnet Labs
- NVD analysis
- Analyzed
- Record last updated
- Aug 26, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
NLnet Labs NSD nlnet_labs:nsd (from the name) | from 4.8.0 before 4.15.1 | CNA record |
nlnetlabs nsd nlnetlabs:nsd | from 4.8.0 before 4.15.1 | NVD |
References
- https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-19538.txtvendor-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.