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CVE-2026-34183

7.5 · HIGH

Issue summary: Remote peer may exhaust heap memory of the QUIC server or client by flooding it with packets containing PATH_CHALLENGE frames.

Published Jun 9, 2026CWE-1325EPSS 1.05%

Overview

CVE-2026-34183 is a high-severity vulnerability. It was published on June 9, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Issue summary: Remote peer may exhaust heap memory of the QUIC

server or client by flooding it with packets containing PATH_CHALLENGE

frames.

Impact summary: A malicious remote peer can cause an unbounded

memory allocation which can lead to an abnormal termination of the

application acting as a QUIC client or server and a Denial of Service.

A remote peer may exhaust heap memory by flooding the local

QUIC stack with PATH_CHALLENGE frames. The local QUIC stack

allocates a PATH_RESPONSE frame for every PATH_CHALLENGE it receives.

The allocated PATH_RESPONSE frame gets freed only when the remote

peer acknowledges reception of the PATH_RESPONSE frame which will

not be done by a malicious peer.

The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by

this issue. The QUIC stack is outside of OpenSSL FIPS module

boundary.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/openssl/openssl/commit/5b306efb0b3779dfdd0803b4afc9d08c91f11517GitHubgithub.com/openssl/openssl/commit/7d06955ebe0ecf8adfd4c1e92018586da47ef9acGitHubgithub.com/openssl/openssl/commit/d2e9efbe4900a373227deb136e8665401404ffacGitHubgithub.com/openssl/openssl/commit/fbaa83859c01ad64f497b757aaf51be7d05ed9ebRefopenssl-library.org/news/secadv/20260609.txt

How CyberStrike helps

Frequently asked questions

What is CVE-2026-34183?

CVE-2026-34183 is a high-severity vulnerability. It was published on June 9, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-34183?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-34183?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-34183?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-34183 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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