🛡️ CVE-2026-54777 — corewcf.netnamedpipe

🟡 CVSS 6.5 — Medium ✅ No Known Exploit CWE-367 NVD
6.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

CoreWCF NetNamedPipe transport accepts attach to a pre-existing named pipe instance

Impact

CoreWCF NetNamedPipe transport accepts attach to a pre-existing named pipe instance, allowing local interception of NetNamedPipe traffic. NetNamedPipe creates a shared memory object based on the listening url, then generated a unique GUID for the named pipe it will be using and saves this to the shared memory object. Then it creates the named pipe to listen for clients. This requires an attacker to race the service and create the named pipe between the service publishing the GUID to the shared memory location (which the attacker needs to read) and the service creating the named pipe itself.

Patches

Fixed in CoreWCF v1.8.1 and v1.9.1

Workarounds

None

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is high, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability low.

Weakness class

CVE-2026-54777 is classified as CWE-367: Time-of-check Time-of-use Race Condition. The state checked and the state acted upon can differ, because it may change between the two steps.

Affected software

CVE-2026-54777 is recorded against 2 packages.

  • corewcf.netnamedpipe (from 1.9.0 up to 1.9.1)
  • unknown

Timeline and source

Published on 19 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com (Web)
github.com (Package)

Details

Severity Medium
CVSS Score 6.5
CVSS Vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L
CWE CWE-367
Public Exploit ✅ No
Source NVD
Published 2026-06-19
Updated 2026-08-12
Modified 2026-06-19
Fix URL N/A

Affected Packages

Software From version Fixed in
corewcf.netnamedpipe 1.9.0 1.9.1
unknown — —

Vulnerability Monitoring

Track new vulnerabilities in corewcf.netnamedpipe

CVE-2026-54777 is rated CVSS 6.5 Medium. BotEraser monitors your WordPress installation and notifies you when software you use appears in our vulnerability database.

Set Up Free Alerts →

No credit card required  ·  Results in minutes

ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.