CVE-2026-34183 Affecting openssl package, versions <1:3.5.5-4.el9_8


Severity

Recommended
high

Based on AlmaLinux security rating.

Threat Intelligence

EPSS
0.53% (41st percentile)

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  • Snyk IDSNYK-ALMALINUX9-OPENSSL-17332495
  • published13 Jun 2026
  • disclosed11 Jun 2026

Introduced: 11 Jun 2026

NewCVE-2026-34183  (opens in a new tab)

How to fix?

Upgrade AlmaLinux:9 openssl to version 1:3.5.5-4.el9_8 or higher.
This issue was patched in ALSA-2026:25239.

NVD Description

Note: Versions mentioned in the description apply only to the upstream openssl package and not the openssl package as distributed by AlmaLinux. See How to fix? for AlmaLinux:9 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1