Is CVE-2026-34183 in the CISA KEV catalog?

No. CVE-2026-34183 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-34183?

CVE-2026-34183 has a CVSS v3 base score of 7.5 (Important).

What is the EPSS score for CVE-2026-34183?

CVE-2026-34183 has an EPSS score of 0.51% (40th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-34183?

Upgrade openssl on debian 13 to 3.5.6-1~deb13u2 or later. Fixes are available for 32 affected products.

CVE & CISA-KEV Catalog

CVE-2026-34183

HIGH

7.5

CVSS v3

NVD

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.

CWE-1325

How to fix

Remediation Available

opensslDebian

Fixed in:3.5.6-1~deb13u2CVE-2026-34183

Fixed in:3.6.3-1CVE-2026-34183

opensslRocky

Fixed in:1:3.5.5-4.el10_2RHSA-2026:25237

Fixed in:1:3.5.5-4.el9_8RHSA-2026:25239

opensslRed Hat / RHEL

Fixed in:1:3.5.5-4.el10_2RHSA-2026:25237

Fixed in:1:3.5.5-4.el9_8RHSA-2026:25239

openssl-debuginfoRed Hat / RHEL

Fixed in:1:3.5.5-4.el10_2RHSA-2026:25237

Fixed in:1:3.5.5-4.el9_8RHSA-2026:25239

openssl-debuginfoRocky

Fixed in:1:3.5.5-4.el10_2RHSA-2026:25237

Fixed in:1:3.5.5-4.el9_8RHSA-2026:25239

openssl-debugsourceRocky

Fixed in:1:3.5.5-4.el10_2RHSA-2026:25237

Fixed in:1:3.5.5-4.el9_8RHSA-2026:25239

openssl-debugsourceRed Hat / RHEL

Fixed in:1:3.5.5-4.el10_2RHSA-2026:25237

Fixed in:1:3.5.5-4.el9_8RHSA-2026:25239

openssl-develRocky

Fixed in:1:3.5.5-4.el10_2RHSA-2026:25237

Fixed in:1:3.5.5-4.el9_8RHSA-2026:25239

openssl-develRed Hat / RHEL

Fixed in:1:3.5.5-4.el10_2RHSA-2026:25237

Fixed in:1:3.5.5-4.el9_8RHSA-2026:25239

openssl-libsRocky

Fixed in:1:3.5.5-4.el10_2RHSA-2026:25237

Fixed in:1:3.5.5-4.el9_8RHSA-2026:25239

openssl-libsRed Hat / RHEL

Fixed in:1:3.5.5-4.el10_2RHSA-2026:25237

Fixed in:1:3.5.5-4.el9_8RHSA-2026:25239

openssl-libs-debuginfoRocky

Fixed in:1:3.5.5-4.el10_2RHSA-2026:25237

Fixed in:1:3.5.5-4.el9_8RHSA-2026:25239

openssl-libs-debuginfoRed Hat / RHEL

Fixed in:1:3.5.5-4.el10_2RHSA-2026:25237

Fixed in:1:3.5.5-4.el9_8RHSA-2026:25239

openssl-perlRed Hat / RHEL

Fixed in:1:3.5.5-4.el10_2RHSA-2026:25237

Fixed in:1:3.5.5-4.el9_8RHSA-2026:25239

openssl-perlRocky

Fixed in:1:3.5.5-4.el10_2RHSA-2026:25237

Fixed in:1:3.5.5-4.el9_8RHSA-2026:25239

registry.redhat.io/costmanagement/costmanagement-metricsRed Hat / RHEL

Fixed in:rhel9-operator@sha256:c76ae9a58852c1e1d7b8745e7152ea06548dfcb07c448618d0f22ee01e110ddf_ppc64leRHSA-2026:39981

Fixed in:rhel9-operator@sha256:7d1fc978c1e10cf51876a725fa41c53c52ecec884c2d25d6f782a7cbd87f4ca1_s390xRHSA-2026:39981

Fixed in:rhel9-operator@sha256:1c4cf70fef001a66b2d93b43668e21e87ccb1203e8206e7449c5a70d9204c593_arm64RHSA-2026:39981

Fixed in:operator-bundle@sha256:fa43be2fd285110e13fb4e782479b28a6e59ffc25da384d4aae745b6d70c74c7_amd64RHSA-2026:39981

Fixed in:rhel9-operator@sha256:093ff7d3b7e420f4cd6650314bea628408ec38e2965e770295f4a5eb8e9b97ea_amd64RHSA-2026:39981

registry.redhat.io/costmanagement/costmanagement-metricsRocky

Fixed in:rhel9-operator@sha256:c76ae9a58852c1e1d7b8745e7152ea06548dfcb07c448618d0f22ee01e110ddf_ppc64leRHSA-2026:39981

Fixed in:rhel9-operator@sha256:1c4cf70fef001a66b2d93b43668e21e87ccb1203e8206e7449c5a70d9204c593_arm64RHSA-2026:39981

Fixed in:operator-bundle@sha256:fa43be2fd285110e13fb4e782479b28a6e59ffc25da384d4aae745b6d70c74c7_amd64RHSA-2026:39981

Fixed in:rhel9-operator@sha256:093ff7d3b7e420f4cd6650314bea628408ec38e2965e770295f4a5eb8e9b97ea_amd64RHSA-2026:39981

Fixed in:rhel9-operator@sha256:7d1fc978c1e10cf51876a725fa41c53c52ecec884c2d25d6f782a7cbd87f4ca1_s390xRHSA-2026:39981

registry.redhat.io/discovery/discoveryRocky

Fixed in:ui-rhel9@sha256:335f5d49155804969d193c3104fd144d7e499e2d5433965b217f379cbcf1cc75_arm64RHSA-2026:29197

Fixed in:server-rhel9@sha256:6a26bc89c61e7fad594399ceda8e170d66fa241d818eada7a12d9fec6bb08ecc_amd64RHSA-2026:29197

Fixed in:ui-rhel9@sha256:16b33ed961e598805d155db8fea7bb293fb8ef95ddd45169c61fbeb5a8944b6b_amd64RHSA-2026:29197

Fixed in:server-rhel9@sha256:ccd969d2710875e82896556e7b3c02e39147d03612452af6b0a916b656ce5b34_arm64RHSA-2026:29197

registry.redhat.io/discovery/discoveryRed Hat / RHEL

Fixed in:server-rhel9@sha256:6a26bc89c61e7fad594399ceda8e170d66fa241d818eada7a12d9fec6bb08ecc_amd64RHSA-2026:29197

Fixed in:ui-rhel9@sha256:16b33ed961e598805d155db8fea7bb293fb8ef95ddd45169c61fbeb5a8944b6b_amd64RHSA-2026:29197

Fixed in:server-rhel9@sha256:ccd969d2710875e82896556e7b3c02e39147d03612452af6b0a916b656ce5b34_arm64RHSA-2026:29197

Fixed in:ui-rhel9@sha256:335f5d49155804969d193c3104fd144d7e499e2d5433965b217f379cbcf1cc75_arm64RHSA-2026:29197

registry.redhat.io/insights-proxy/insights-proxyRocky

Fixed in:container-rhel9@sha256:d819e02ffed786e8544254bd3780dcd8a336ac8640bcfe46bdafaaa5f59e192c_arm64RHSA-2026:34102

Fixed in:container-rhel9@sha256:ab22b39e57764b0b91cf5576c7a59ce8b0eb9174d957b54fe95daf16580f0720_amd64RHSA-2026:34102

registry.redhat.io/insights-proxy/insights-proxyRed Hat / RHEL

Fixed in:container-rhel9@sha256:d819e02ffed786e8544254bd3780dcd8a336ac8640bcfe46bdafaaa5f59e192c_arm64RHSA-2026:34102

Fixed in:container-rhel9@sha256:ab22b39e57764b0b91cf5576c7a59ce8b0eb9174d957b54fe95daf16580f0720_amd64RHSA-2026:34102

registry.redhat.io/rhui5/cdsRed Hat / RHEL

Fixed in:kubernetes-rhel9@sha256:2958104c085c46561c9453784a06a36ab12a27e21ba1e732b4b30a092bb58805_amd64RHSA-2026:26319

Fixed in:rhel9@sha256:5c18f8336186fb1c9dbc1e710e91420ca3f5eca92b081cace3325585789f4825_amd64RHSA-2026:26319

registry.redhat.io/rhui5/cdsRocky

Fixed in:rhel9@sha256:5c18f8336186fb1c9dbc1e710e91420ca3f5eca92b081cace3325585789f4825_amd64RHSA-2026:26319

Fixed in:kubernetes-rhel9@sha256:2958104c085c46561c9453784a06a36ab12a27e21ba1e732b4b30a092bb58805_amd64RHSA-2026:26319

registry.redhat.io/rhui5/haproxyRocky

Fixed in:rhel9@sha256:66ccfb245bd6461e49aa0c84742710b557b9924baaef38e02904c6fd2f8db0c5_amd64RHSA-2026:26319

registry.redhat.io/rhui5/haproxyRed Hat / RHEL

Fixed in:rhel9@sha256:66ccfb245bd6461e49aa0c84742710b557b9924baaef38e02904c6fd2f8db0c5_amd64RHSA-2026:26319

registry.redhat.io/rhui5/installerRed Hat / RHEL

Fixed in:rhel9@sha256:4b793b24511377dd18beae2f85792e8b2af0c615837155137a62f65e171ca0d7_amd64RHSA-2026:26319

registry.redhat.io/rhui5/installerRocky

Fixed in:rhel9@sha256:4b793b24511377dd18beae2f85792e8b2af0c615837155137a62f65e171ca0d7_amd64RHSA-2026:26319

registry.redhat.io/rhui5/rhuaRed Hat / RHEL

Fixed in:rhel9@sha256:a79dde325d7229002a36a0a8ad75ae8c25e96004a9e5f0b90c51fc335460dccf_amd64RHSA-2026:26319

registry.redhat.io/rhui5/rhuaRocky

Fixed in:rhel9@sha256:a79dde325d7229002a36a0a8ad75ae8c25e96004a9e5f0b90c51fc335460dccf_amd64RHSA-2026:26319

libssl3Ubuntu

Fixed in:3.0.2-0ubuntu1.25USN-8414-1

libssl3t64Ubuntu

Fixed in:3.0.13-0ubuntu3.11USN-8414-1

Fixed in:3.5.3-1ubuntu3.4USN-8414-1

opensslUbuntu

Fixed in:3.0.2-0ubuntu1.25USN-8414-1

Fixed in:3.0.13-0ubuntu3.11USN-8414-1

Fixed in:3.5.3-1ubuntu3.4USN-8414-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

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

Exploit Intelligence

0.51%probability of exploitation in 30 days

40thpercentile

Moderate risk: more likely to be exploited than 40% of all known CVEs.

References

Patch4

Vendor Advisory1

openssl-library.org

Related Vulnerabilities

Other CWE-1325 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-2511	Medium	5.9	54%	-	Fix
CVE-2023-3341	High	7.5	2.6%	-	Fix
CVE-2024-27804	Medium	5.5	1.3%	-	Fix
CVE-2021-43174	High	7.5	1.2%	-	Fix
CVE-2025-2240	High	7.5	0.9%	-	-
CVE-2023-28968	Medium	5.3	0.6%	-	Fix

Embed a live status badge for CVE-2026-34183

Markdown

[![CVE-2026-34183](https://tridentstack.com/cve/badge/CVE-2026-34183.svg)](https://tridentstack.com/cve/CVE-2026-34183)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-34183"><img src="https://tridentstack.com/cve/badge/CVE-2026-34183.svg" alt="CVE-2026-34183"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

See how it works Start freeThis CVE lookup is free and always will be.

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-15.