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Public proof of conceptFix available

CVE-2026-31812

A public proof of concept exists; no exploitation attested.

  • Published2026-03-10
  • Fixed in0.11.14
  • WeaknessCWE-248

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2026-03-1022:16CVE publishedNVD

Versions per branch

OSV
quinn-proto
BranchAffectedFixed in
0.11< 0.11.140.11.14
0.x≥ 0.5.0, < 0.11.140.11.14

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • quinn-rs quinn
    Affected
    • = < 0.11.14no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-03-10

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • apollo-router-2Chainguardall versions · fixed in 2.16.0-r1
  • apollo-router-2.10MinimOSall versions · no fixed version listed
  • asciinemaChainguardall versions · fixed in 3.2.0-r1
  • bergWolfiall versions · fixed in 0.5.5-r2
  • bergChainguardall versions · fixed in 0.5.5-r2
  • fnmChainguardall versions · fixed in 1.39.0-r1
  • garage-2Chainguardall versions · fixed in 2.3.0-r2
  • komodo-cliChainguardall versions · fixed in 1.19.5-r5and 2 other packages

78 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-31812 Red Hat Product Security18 products fixed · 19 known affected

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

    build-of-trustee/trustee-rhel9 as a component of Confidential Compute Attestation · confidential-compute-attestation-tech-preview/trustee-rhel9 as a component of Confidential Compute Attestation · openshift-sandboxed-containers/osc-podvm-builder-rhel9 as a component of Confidential Compute Attestation · +16 more

  • RHSA-2026:87410 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: RHOAI 2.25.12 - Red Hat OpenShift AI

  • RHSA-2026:22862 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Logging for Red Hat OpenShift - 6.4.5

  • RHSA-2026:19712 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: RHOAI 3.3.3 - Red Hat OpenShift AI

  • RHSA-2026:13545 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.6 Container Release Update

  • RHSA-2026:5459 Red Hat Product Security2 products fixed

    Red Hat Security Advisory: RHTAS 1.3.3 - Red Hat Trusted Artifact Signer Release

Full record on NVD

Fix

  1. Update quinn-proto to 0.11.14
  2. Vendor fix Red Hat Product Security RHSA-2026:87410 · 4 productsFor Red Hat OpenShift AI 2.25.12 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/red_hat_openshift_ai/
  3. Vendor fix Red Hat Product Security RHSA-2026:22862 · 4 productsFor OpenShift Container Platform 4.20 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/openshift_container_platform/4.20/html/relea…
  4. Vendor fix Red Hat Product Security RHSA-2026:19712 · 4 productsFor Red Hat OpenShift AI 3.3.3 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/red_hat_openshift_ai/
  5. Vendor fix Red Hat Product Security RHSA-2026:13545 · 4 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://docs.redhat.com/en/documentation/red_hat_ansible_automation_platform/2.6#Upgrade
  6. Vendor fix Red Hat Product Security RHSA-2026:5459 · 2 productsRed Hat Trusted Artifact Signer simplifies cryptographic signing and verifying of software artifacts such as container images, binaries and source code changes. It is a self-managed on-premise deployment of the Sigstore project available at https://sigstore.dev Platform Engineers, Software Develop…
  7. Workaround from the vendor Red Hat Product Security RHSA-2026:87410 · 205 productsMitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVE recordread 2026-10-23
  • CISA-ADPSSVC decisionpoc2026-03-11
  • CNACVSS 4.08.7known since 2026-10-23
  • CNACVSS 3.15.3known since 2026-10-23
  • CNAweakness (CWE)CWE-248known since 2026-10-23
  • FIRST EPSSEPSS score0.6 %2026-11-08
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryHIGH2026-03-11

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS 4.0 vector
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
Published
2026-03-10
Last Modified
2026-08-25
NVD status
Deferred
GitHub Advisory
GHSA-6xvm-j4wr-6v98

Frequently asked questions

What is CVE-2026-31812?

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.

Is CVE-2026-31812 actively exploited?

A proof-of-concept exploit exists for CVE-2026-31812, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-31812?

CVE-2026-31812 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

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