Critical 9.1Published Oct 8, 2026

CVE-2026-88647A hostname verification bypass in GnuTLS v3.8.13 allows attackers to circumvent the Common Name fallback mechanism and eavesdrop on communications via a crafted certificate.

Updated under an hour ago (2026-10-19 06:25 UTC)

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EPSS puts the chance of exploitation in the next 30 days at 0.21%, higher than 11% of scored CVEs.

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Exploited in the last 30 days

A hostname verification bypass in GnuTLS v3.8.13 allows attackers to circumvent the Common Name fallback mechanism and eavesdrop on communications via a crafted certificate.

CVSS: 9.1 CRITICAL (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness (CWE): CWE-297
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.21% (percentile 11)
Assigned by: mitre
NVD analysis: Awaiting Analysis
Record last updated: Oct 10, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

No affected products are listed yet.

References

https://gitlab.com/gnutls/gnutls/-/issues/1802
https://gist.github.com/lkloliver/f98ec3de1a871fdfc02b70b8b9ba7642

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.