CVE-2026-45254 | Incorrect libcap_net limitation list manipulation

In the case of the cap_net service, when a key present in the old limit was omitted from the new limit, the missing key was treated as "allow any" instead of being rejected. In certain scenarios, an application that had previously restricted a subset of network operations could ask for a new limit that extended the permissions of the process.

Published: 2026-05-21 Last update: 2026-05-21 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-45254 is rated Low Risk (32.8/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.06%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-45254

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-09 0.01% 0.06% +0.05%
2 2026-05-21 — 0.01% —

Full EPSS history (2 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-45254

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 2.5 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2026-45254

GitHub Security Advisory for CVE-2026-45254

GHSA-rx3c-36rq-fgf8 · Severity: medium — In the case of the cap_net service, when a key present in the old limit was omitted from the new...

Affected software / configurations for CVE-2026-45254

Vendor Product Version Raw CPE
freebsd freebsd 14.3 cpe:2.3:o:freebsd:freebsd:14.3:-:*:*:*:*:*:*
freebsd freebsd 14.3 cpe:2.3:o:freebsd:freebsd:14.3:p1:*:*:*:*:*:*
freebsd freebsd 14.3 cpe:2.3:o:freebsd:freebsd:14.3:p10:*:*:*:*:*:*
freebsd freebsd 14.3 cpe:2.3:o:freebsd:freebsd:14.3:p11:*:*:*:*:*:*
freebsd freebsd 14.3 cpe:2.3:o:freebsd:freebsd:14.3:p12:*:*:*:*:*:*
freebsd freebsd 14.3 cpe:2.3:o:freebsd:freebsd:14.3:p13:*:*:*:*:*:*
freebsd freebsd 14.3 cpe:2.3:o:freebsd:freebsd:14.3:p2:*:*:*:*:*:*
freebsd freebsd 14.3 cpe:2.3:o:freebsd:freebsd:14.3:p3:*:*:*:*:*:*
freebsd freebsd 14.3 cpe:2.3:o:freebsd:freebsd:14.3:p4:*:*:*:*:*:*
freebsd freebsd 14.3 cpe:2.3:o:freebsd:freebsd:14.3:p5:*:*:*:*:*:*
freebsd freebsd 14.3 cpe:2.3:o:freebsd:freebsd:14.3:p6:*:*:*:*:*:*
freebsd freebsd 14.3 cpe:2.3:o:freebsd:freebsd:14.3:p7:*:*:*:*:*:*
freebsd freebsd 14.3 cpe:2.3:o:freebsd:freebsd:14.3:p8:*:*:*:*:*:*
freebsd freebsd 14.3 cpe:2.3:o:freebsd:freebsd:14.3:p9:*:*:*:*:*:*
freebsd freebsd 14.4 cpe:2.3:o:freebsd:freebsd:14.4:-:*:*:*:*:*:*
freebsd freebsd 14.4 cpe:2.3:o:freebsd:freebsd:14.4:p1:*:*:*:*:*:*
freebsd freebsd 14.4 cpe:2.3:o:freebsd:freebsd:14.4:p2:*:*:*:*:*:*
freebsd freebsd 14.4 cpe:2.3:o:freebsd:freebsd:14.4:p3:*:*:*:*:*:*
freebsd freebsd 14.4 cpe:2.3:o:freebsd:freebsd:14.4:p4:*:*:*:*:*:*
freebsd freebsd 14.4 cpe:2.3:o:freebsd:freebsd:14.4:rc1:*:*:*:*:*:*
freebsd freebsd 15.0 cpe:2.3:o:freebsd:freebsd:15.0:-:*:*:*:*:*:*
freebsd freebsd 15.0 cpe:2.3:o:freebsd:freebsd:15.0:p1:*:*:*:*:*:*
freebsd freebsd 15.0 cpe:2.3:o:freebsd:freebsd:15.0:p2:*:*:*:*:*:*
freebsd freebsd 15.0 cpe:2.3:o:freebsd:freebsd:15.0:p3:*:*:*:*:*:*
freebsd freebsd 15.0 cpe:2.3:o:freebsd:freebsd:15.0:p4:*:*:*:*:*:*
freebsd freebsd 15.0 cpe:2.3:o:freebsd:freebsd:15.0:p5:*:*:*:*:*:*
freebsd freebsd 15.0 cpe:2.3:o:freebsd:freebsd:15.0:p6:*:*:*:*:*:*
freebsd freebsd 15.0 cpe:2.3:o:freebsd:freebsd:15.0:p7:*:*:*:*:*:*
freebsd freebsd 15.0 cpe:2.3:o:freebsd:freebsd:15.0:p8:*:*:*:*:*:*

References for CVE-2026-45254

cvelogic Threat Intelligence