Google crypto tls up to 1.26.8/1.27.1 Packet amplification

Summaryinfo

A vulnerability was found in Google crypto tls up to 1.26.8/1.27.1. It has been classified as problematic. The affected element is an unknown function of the component Packet Handler. Performing a manipulation results in amplification. This vulnerability is reported as CVE-2026-97031. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Google crypto tls up to 1.26.8/1.27.1. It has been classified as problematic. This affects an unknown code block of the component Packet Handler. The manipulation with an unknown input leads to a amplification vulnerability. CWE is classifying the issue as CWE-405. The product does not properly control situations in which an adversary can cause the product to consume or produce excessive resources without requiring the adversary to invest equivalent work or otherwise prove authorization, i.e., the adversary's influence is "asymmetric." This is going to have an impact on availability. The summary by CVE is:

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.

This vulnerability is uniquely identified as CVE-2026-97031 since 09/24/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/09/2026). The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Upgrading to version 1.26.9 or 1.27.2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-95422). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• Google

Name

• crypto tls

Version

• 1.26.0
• 1.26.1
• 1.26.2
• 1.26.3
• 1.26.4
• 1.26.5
• 1.26.6
• 1.26.7
• 1.26.8
• 1.27.0
• 1.27.1

License

• free

Website

• Vendor: https://www.google.com/

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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