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VulnerabilityCVE-2026-97031Published 2026-10-08

CVE-2026-97031 — Go standard library crypto/tls

high

As of 2026-10-09, CVE-2026-97031 is a HIGH-severity vulnerability in Go standard library crypto/tls, CVSS v3.1 7.5, EPSS 0.1% (6.8th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-97031 as of 2026-10-09; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

CVSS v3.1
7.5/10High
EPSS
0.1%Higher than 6.8% of scored CVEs
CISA KEV
NoNot in the KEV catalog
Tracked threats
0None linked yet
Priority
4/10Threadlinqs triage score
Published
Updated 2026-10-09
CVSS v3.1 7.5 (HIGH) · EPSS 0.1% (higher than 6.8% of all scored CVEs) · Priority 4/10 · Published 2026-10-08

Last updated:

What is CVE-2026-97031?

Multiple ECH outer extension references are not permitted under RFC 9849; previously, a client could send a well-crafted packet that could trigger memory exhaustion in the server process by specifying multiple references. We now reject these as malformed and curb the memory amplification vector as a result.

The record classifies CVE-2026-97031 under weakness class CWE-405. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 2 days ago.

Severity and exploitation probability

CVSS v3.1 base score
7.5 — HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (FIRST)
0.1% probability of exploitation in the next 30 days, higher than 6.8% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
4/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-10-08, last modified 2026-10-09

Is CVE-2026-97031 being exploited?

It currently carries a trending score of 31 in the Threadlinqs vulnerability feed.

Affected products and versions

How to fix CVE-2026-97031

No vendor patch reference has been recorded for CVE-2026-97031 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

Threat activity tracking CVE-2026-97031

No threat campaign in the Threadlinqs corpus currently references CVE-2026-97031, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

Sources

Enriched from CVE.org, NVD, GitHub Security Advisories, FIRST EPSS. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.

Other references