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Fencer Intel
medium 5.3

CVE-2026-31812 json

Quinn affected by unauthenticated remote DoS via panic in QUIC transport parameter parsing

published 8mo ago modified last mo. also EUVD-2026-10908 , GHSA-6xvm-j4wr-6v98 , RUSTSEC-2026-0037

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 47%
public exploits
0
none known

Summary

Quinn is a pure-Rust, async-compatible implementation of the IETF QUIC transport protocol. Prior to 0.11.14, a remote, unauthenticated attacker can trigger a denial of service in applications using vulnerable quinn versions by sending a crafted QUIC Initial packet containing malformed quic_transport_parameters. In quinn-proto parsing logic, attacker-controlled varints are decoded with unwrap(), so truncated encodings cause Err(UnexpectedEnd) and panic. This is reachable over the network with a single packet and no prior trust or authentication. This vulnerability is fixed in 0.11.14.

Patch / fix

  • crates.io quinn-proto 0.11.14
  • Red Hat Logging Subsystem for Red Hat OpenShift 6.4 1780052069
  • Red Hat Red Hat Ansible Automation Platform 2.6 1777398576
  • Red Hat Red Hat OpenShift AI 3.3 1778596806
  • Red Hat Red Hat Trusted Artifact Signer 1.3 1773307309
  • rust-quinn-proto Debian 14 0.11.14-1

debian advisories DEBIAN-CVE-2026-31812

  • python-uv SLES for SAP applications 16.0, SLES 16.0 0.7.18-160000.5.1
  • rust1.93 SLE Module for Development Tools 15 SP7, openSUSE Leap 15.6 1.93.0-150300.7.6.1
  • rust1.92 SLE Module for Development Tools 15 SP7, openSUSE Leap 15.6 1.92.0-150300.7.6.1
  • rust1.94 SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +9 more 1.94.0-150300.7.6.1
  • rust SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES 15 SP6-LTSS +5 more 1.94.0-150500.27.65.1
  • rust SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS +1 more 1.94.0-150400.24.71.1

suse advisories SUSE-SU-2026:22005-1SUSE-SU-2026:1415-1SUSE-SU-2026:1337-1SUSE-RU-2026:1001-1

  • rust1.94 openSUSE Leap 16.0 1.94.1-160000.1.1
  • python-uv openSUSE Tumbleweed 0.10.11-1.1
  • rust1.92 openSUSE Tumbleweed 1.92.0-2.1
  • rust1.93 openSUSE Tumbleweed 1.93.0-3.1
  • rust1.94 openSUSE Tumbleweed 1.94.0-2.1

opensuse advisories openSUSE-SU-2026:20569-1openSUSE-SU-2026:10380-1openSUSE-SU-2026:10382-1openSUSE-SU-2026:10383-1openSUSE-SU-2026:10384-1

Is CVE-2026-31812 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-31812 updated cvss 5.3

quinn-proto: quinn-proto: Denial of Service via crafted QUIC Initial packet

  • Red Hat Confidential Compute Attestation build-of-trustee/trustee-rhel9, openshift-sandboxed-containers/osc-podvm-builder-rhel9, openshift-sandboxed-containers/osc-podvm-payload-rhel9, confidential-compute-attestation-tech-preview/trustee-rhel9
    affected: workaround, no fix available, no fix planned “Will not fix”
  • Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/vector-rhel9, openshift-logging/fluentd-rhel9, openshift-logging/eventrouter-rhel9, openshift-logging/logging-view-plugin-rhel9, openshift-logging/cluster-logging-rhel9-operator, openshift-logging/log-file-metric-exporter-rhel9, +1 more Red Hat Enterprise Linux 9 firefox, firefox-x11, clevis-pin-trustee Red Hat Enterprise Linux 10 clevis-pin-trustee
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Enterprise Linux AI (RHEL AI) 3 rust
    affected: workaround, no fix available
  • Red Hat OpenShift Container Platform 4 kata-containers
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Logging Subsystem for Red Hat OpenShift 6.4 openshift-logging/vector-rhel9 1780052069
    fixed: vendor fix RHSA-2026:22862
  • Red Hat Ansible Automation Platform 2.6 ansible-automation-platform-26 1777398576
    fixed: vendor fix RHSA-2026:13545
  • Red Hat OpenShift AI 2.25 rhoai/odh-fms-guardrails-orchestrator-rhel9 1791535252
    fixed: vendor fix RHSA-2026:87410
  • Red Hat OpenShift AI 3.3 rhoai 1778596806
    fixed: vendor fix RHSA-2026:19712
show 7 more
  • Red Hat Trusted Artifact Signer 1.3 rhtas 1773307309
    fixed: vendor fix RHSA-2026:5459
  • Red Hat Confidential Compute Attestation openshift-sandboxed-containers/osc-monitor-rhel9, openshift-sandboxed-containers/osc-rhel9-operator, openshift-sandboxed-containers/osc-operator-bundle Red Hat Logging Subsystem for Red Hat OpenShift 6.4 openshift-logging/eventrouter-rhel9 1780051640, openshift-logging/logging-loki-rhel9 1780051809, openshift-logging/loki-rhel9-operator 1780051656, openshift-logging/opa-openshift-rhel9 1780051640, openshift-logging/loki-operator-bundle 1780055542, openshift-logging/lokistack-gateway-rhel9 1780051644, +3 more Red Hat Ansible Automation Platform 2.6 ansible-automation-platform 1777410604, ansible-automation-platform 1777410621, ansible-automation-platform-26 1777163004, ansible-automation-platform-26 1777163348, ansible-automation-platform-26 1777163557, ansible-automation-platform-26 1777163594, +23 more
    not affected: vulnerable code not present
  • Red Hat Enterprise Linux 7 firefox
    not affected: vulnerable code not in execute path
  • Red Hat Enterprise Linux 8 rls, rust, cargo, clippy, firefox, rustfmt, +10 more Red Hat Enterprise Linux 9 rust, cargo, clippy, rustfmt, rust-gdb, rust-src, +10 more
    not affected: component not present
  • Red Hat Enterprise Linux 10 rust, firefox, trustee, thunderbird, virt-firmware-rs, trustee-guest-components
    not affected: vulnerable code not in execute path
  • Red Hat OpenShift AI 2.25 rhoai/odh-rhel9-operator 1792570619, rhoai/odh-vllm-cpu-rhel9 1792018436, rhoai/odh-dashboard-rhel9 1791853525, rhoai/odh-modelmesh-rhel9 1790881700, rhoai/odh-operator-bundle 1792571069, rhoai/odh-vllm-cuda-rhel9 1791358976, +65 more Red Hat OpenShift AI 3.3 rhoai 1778239104, rhoai 1778262829, rhoai 1778262856, rhoai 1778262893, rhoai 1778262907, rhoai 1778262952, +75 more Red Hat OpenShift Update Service openshift-update-service/openshift-update-service-rhel8
    not affected: vulnerable code not present
  • Red Hat Trusted Profile Analyzer rhtpa/rhtpa-trustification-service-rhel9
    not affected: component not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
7mo ago

Exploit prediction

0.57% chance of exploitation in the next 30 days, higher than 47% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 4.0 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
CISA ADP 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CNA 4.0 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected packages

ecosystem package affected fixed in
crates.io quinn-proto
<0.11.14
>=0.5.0, <0.11.14
0.11.14

Affected products

  • quinn-rs quinn
  • Red Hat Logging Subsystem for Red Hat OpenShift 6.4
  • Red Hat Red Hat Ansible Automation Platform 2.6
  • Red Hat Red Hat OpenShift AI 3.3
  • Red Hat Red Hat Trusted Artifact Signer 1.3
  • Red Hat Confidential Compute Attestation
  • Red Hat Logging Subsystem for Red Hat OpenShift
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux AI (RHEL AI) 3
  • Red Hat Red Hat OpenShift AI (RHOAI)
  • Red Hat Red Hat OpenShift Container Platform 4
  • Red Hat Red Hat OpenShift Update Service
  • Red Hat Red Hat Trusted Profile Analyzer

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.