Is CVE-2026-55960 actively exploited?

No active exploitation of CVE-2026-55960 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-55960 be exploited remotely?

Yes. CVE-2026-55960 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-55960?

CVE-2026-55960 has a CVSS score of 7.5 (HIGH).

HOME VULNERABILITIESCVE-2026-55960

HIGH

CVE-2026-55960

CWE-295Published: June 25, 2026· Updated: Jun 26, 2026

7.5

CVSS v3.1

EPSS:0.14%probability of exploitation in 30 daysPercentile:4.1th

Official Description

Un-negotiated Raw Public Key (RFC 7250) accepted in place of an X.509 certificate, bypassing chain validation. A raw public key has no chain, so ParseCertRelative() accepts it without performing any trust verification; it must therefore only be accepted when RPK was actually negotiated for that peer. The check now defaults the expected type to X.509 (per RFC 7250/8446) when no type was negotiated, comparing against the received server certificate type on the client and the selected client certificate type on the server, and rejects any mismatch, including an un-negotiated raw public key, with UNSUPPORTED_CERTIFICATE. Only affects builds with Raw Public Key support (HAVE_RPK) enabled - disabled by default in a standalone build, but included in --enable-all.

NVD Source

Technical Analysis

CVE-2026-55960 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 7.5.