CVE-2026-34183

HIGH EPSS 39.7%
Published Jun 9, 20262w ago · Modified Jun 17, 20261w ago
7.5 CVSS 3.1
High
Find Similar
Published Jun 9, 2026 2w ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
39.7% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-1325

Affected Products 4

VendorProductVersionRange
opensslopenssl*≥3.4.0  –  <3.4.6
opensslopenssl*≥3.5.0  –  <3.5.7
opensslopenssl*≥3.6.0  –  <3.6.3
opensslopenssl4.0.0any

References 5

  • github.com https://github.com/openssl/openssl/commit/5b306efb0b3779dfdd0803b4afc9d08c91f11517
    Patch
  • github.com https://github.com/openssl/openssl/commit/7d06955ebe0ecf8adfd4c1e92018586da47ef9ac
    Patch
  • github.com https://github.com/openssl/openssl/commit/d2e9efbe4900a373227deb136e8665401404ffac
    Patch
  • github.com https://github.com/openssl/openssl/commit/fbaa83859c01ad64f497b757aaf51be7d05ed9eb
    Patch
  • openssl-library.org https://openssl-library.org/news/secadv/20260609.txt
    Vendor Advisory

Remediation

  • github.com https://github.com/openssl/openssl/commit/5b306efb0b3779dfdd0803b4afc9d08c91f11517
    Patch
  • github.com https://github.com/openssl/openssl/commit/7d06955ebe0ecf8adfd4c1e92018586da47ef9ac
    Patch
  • github.com https://github.com/openssl/openssl/commit/d2e9efbe4900a373227deb136e8665401404ffac
    Patch
  • github.com https://github.com/openssl/openssl/commit/fbaa83859c01ad64f497b757aaf51be7d05ed9eb
    Patch