HOMEVULNERABILITIESCVE-2026-34183
HIGH

CVE-2026-34183

CWE-1325Published: June 9, 2026· Updated: Jun 15, 2026

7.5
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2026-34183 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

OpenSSL1 product
openssl
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/openssl/openssl/commit/5b306efb0b3779dfdd0803b4afc9d08c91f11517
PATCHhttps://github.com/openssl/openssl/commit/7d06955ebe0ecf8adfd4c1e92018586da47ef9ac
PATCHhttps://github.com/openssl/openssl/commit/d2e9efbe4900a373227deb136e8665401404ffac
PATCHhttps://github.com/openssl/openssl/commit/fbaa83859c01ad64f497b757aaf51be7d05ed9eb
ADVISORYhttps://openssl-library.org/news/secadv/20260609.txt

All References (5)

→
https://github.com/openssl/openssl/commit/5b306efb0b3779dfdd0803b4afc9d08c91f11517Patch
→
https://github.com/openssl/openssl/commit/7d06955ebe0ecf8adfd4c1e92018586da47ef9acPatch
→
https://github.com/openssl/openssl/commit/d2e9efbe4900a373227deb136e8665401404ffacPatch
→
https://github.com/openssl/openssl/commit/fbaa83859c01ad64f497b757aaf51be7d05ed9ebPatch
→
https://openssl-library.org/news/secadv/20260609.txtVendor Advisory

Quick Facts

CVE IDCVE-2026-34183
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-1325
CISA KEVNo
Affected1 vendor
PublishedJun 9, 2026

Related CVEs (CWE-1325)

CVE-2026-3201
7.5
CVE-2026-8199
6.5
CVE-2026-6535
5.5
CVE-2026-6867
5.5
CVE-2026-6869
5.5
CVE-2026-6533
5.5

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-34183 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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