SB2026100195 - Ubuntu update for openssl

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Main Vulnerability Database SB2026100195

SB2026100195 - Ubuntu update for openssl

Published: October 1, 2026

Security Bulletin ID SB2026100195
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 50% Low 50%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 vulnerabilities.


1) Inefficient Algorithmic Complexity (CVE-ID: CVE-2026-42772)

CWE-ID: CWE-407 - Inefficient Algorithmic Complexity

CVSSv4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote user to cause a denial of service.

The vulnerability exists due to inefficient algorithmic complexity in QUIC stream fragment reassembly when handling out-of-order stream fragments. A remote user can manipulate stream fragment offsets to cause a denial of service.

Exploitation requires completion of the QUIC handshake and can use compliant STREAM frames within the advertised receive window.


2) Allocation of Resources Without Limits or Throttling (CVE-ID: CVE-2026-54873)

CWE-ID: CWE-770 - Allocation of Resources Without Limits or Throttling

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to allocation of resources without limits or throttling in QUIC stream fragment metadata handling when stream data remains in packet buffers pending application reads. A remote attacker can send crafted QUIC packets to cause a denial of service.

Packet-buffer retention time is controlled by the remote peer.


Remediation

Install update from vendor's website.

References