CVE-2026-31812

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 59% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Elevated
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 5.3Exploit: Elevated riskExposed: 0

A fix is available — apply it.

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.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity53% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
42%
KEV
Not listed

Published

March 10, 2026

Last Modified

August 25, 2026

Advisory Details (8)

Auto-updated Jul 19, 2026
🔬 Proof of concept available. Patch available. Sources: github, redhat.
redhat

Affected: Red Hat Enterprise Linux 10",

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31812.json
redhat Patch Available

2446330 – (CVE-2026-31812) CVE-2026-31812 quinn-proto: quinn-proto: Denial of Service via crafted QUIC Initial packet

https://bugzilla.redhat.com/show_bug.cgi?id=2446330
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-31812
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:5459
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:22862
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:19712
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:13545
github Patch Available🟡 PoC Available

Unauthenticated remote DoS via panic in QUIC transport parameter parsing (UnexpectedEnd on malformed varint) · Advisory · quinn-rs/quinn · GitHub

https://github.com/quinn-rs/quinn/security/advisories/GHSA-6xvm-j4wr-6v98

Vendor Advisories for CVE-2026-31812(4)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatopenshift-logging/vector-rhel9:17800520692026-06-03redhat
redhatrhoai/odh-model-registry-job-async-upload-rhel9:17785968062026-05-20redhat
redhatansible-automation-platform-26/lightspeed-chatbot-rhel9:17773985762026-05-04redhat
redhatrhtas/tuftool-rhel9:17733073092026-03-23redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
crates.io(1)
PackageVulnerable rangeFixed inDependents
quinn-proto—0.11.14—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
rust-quinn-proto0.10.2-1 ... 0.9.2-2 (11 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
rust-quinn-proto0.11.13-1 ... 0.11.9-3 (6 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
rust-quinn-proto0.11.13-1, 0.11.9-1, 0.11.9-2, 0.11.9-30.11.14-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 38× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 228 total refreshes for this CVE.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 19:27 UTCEPSS rescore
  3. 2026-09-17 19:30 UTCEPSS rescore
  4. 2026-09-16 14:08 UTCEPSS rescore
  5. 2026-09-16 05:15 UTCEPSS rescore
  6. 2026-09-13 16:47 UTCEPSS rescore
  7. 2026-09-13 11:54 UTCOSV refresh
  8. 2026-09-12 15:01 UTCEPSS rescore
  9. 2026-09-11 14:52 UTCEPSS rescore
  10. 2026-09-10 09:34 UTCEPSS rescore
  11. 2026-09-08 22:00 UTCEPSS rescore
  12. 2026-09-07 16:01 UTCEPSS rescore
  13. 2026-09-06 13:47 UTCEPSS rescore
  14. 2026-09-06 13:47 UTCEPSS rescore
  15. 2026-09-04 05:06 UTCEPSS rescore
  16. 2026-09-02 14:11 UTCEPSS rescore
  17. 2026-09-01 13:53 UTCEPSS rescore
  18. 2026-09-01 04:39 UTCEPSS rescore
  19. 2026-09-01 04:39 UTCEPSS rescore
  20. 2026-08-30 19:17 UTCEPSS rescore
  21. 2026-08-30 01:22 UTCEPSS rescore
  22. 2026-08-28 21:41 UTCEPSS rescore
  23. 2026-08-27 14:25 UTCEPSS rescore
  24. 2026-08-26 14:46 UTCEPSS rescore
  25. 2026-08-25 13:49 UTCEPSS rescore
Show 75 more
  1. 2026-08-25 13:26 UTCEG score recompute
  2. 2026-08-25 13:26 UTCVendor advisory
  3. 2026-08-25 12:22 UTCEG score recompute
  4. 2026-08-25 12:22 UTCVendor advisory
  5. 2026-08-24 14:17 UTCEPSS rescore
  6. 2026-08-24 12:27 UTCEG score recompute
  7. 2026-08-24 12:27 UTCVendor advisory
  8. 2026-08-23 00:19 UTCEPSS rescore
  9. 2026-08-21 23:49 UTCEPSS rescore
  10. 2026-08-21 12:32 UTCEG score recompute
  11. 2026-08-21 12:32 UTCVendor advisory
  12. 2026-08-20 22:55 UTCEPSS rescore
  13. 2026-08-20 22:55 UTCEPSS rescore
  14. 2026-08-19 17:03 UTCEPSS rescore
  15. 2026-08-19 12:12 UTCEG score recompute
  16. 2026-08-19 12:12 UTCVendor advisory
  17. 2026-08-18 13:48 UTCEPSS rescore
  18. 2026-08-17 13:47 UTCEPSS rescore
  19. 2026-08-17 12:13 UTCEG score recompute
  20. 2026-08-17 12:13 UTCVendor advisory
  21. 2026-08-16 14:56 UTCEPSS rescore
  22. 2026-08-16 11:58 UTCEG score recompute
  23. 2026-08-16 11:58 UTCVendor advisory
  24. 2026-08-16 02:14 UTCEPSS rescore
  25. 2026-08-15 01:30 UTCEPSS rescore
  26. 2026-08-14 07:56 UTCEG score recompute
  27. 2026-08-14 07:56 UTCVendor advisory
  28. 2026-08-13 22:00 UTCEPSS rescore
  29. 2026-08-12 23:10 UTCEG score recompute
  30. 2026-08-12 23:10 UTCVendor advisory
  31. 2026-08-12 13:50 UTCEPSS rescore
  32. 2026-08-11 13:24 UTCEG score recompute
  33. 2026-08-11 13:24 UTCVendor advisory
  34. 2026-08-11 12:24 UTCEG score recompute
  35. 2026-08-11 12:24 UTCVendor advisory
  36. 2026-08-11 00:00 UTCEPSS rescore
  37. 2026-08-10 13:22 UTCEG score recompute
  38. 2026-08-10 13:22 UTCVendor advisory
  39. 2026-08-10 12:27 UTCEG score recompute
  40. 2026-08-10 12:27 UTCVendor advisory
  41. 2026-08-10 08:23 UTCEG score recompute
  42. 2026-08-10 08:23 UTCVendor advisory
  43. 2026-08-09 13:46 UTCEPSS rescore
  44. 2026-08-09 07:37 UTCEG score recompute
  45. 2026-08-09 07:37 UTCVendor advisory
  46. 2026-08-08 16:37 UTCEPSS rescore
  47. 2026-08-07 18:25 UTCEG score recompute
  48. 2026-08-07 18:25 UTCVendor advisory
  49. 2026-08-06 13:46 UTCEPSS rescore
  50. 2026-08-06 13:39 UTCEG score recompute
  51. 2026-08-06 13:39 UTCVendor advisory
  52. 2026-08-06 12:34 UTCEG score recompute
  53. 2026-08-06 12:34 UTCVendor advisory
  54. 2026-08-06 02:07 UTCEG score recompute
  55. 2026-08-06 02:07 UTCVendor advisory
  56. 2026-08-05 19:17 UTCEPSS rescore
  57. 2026-08-04 15:10 UTCEPSS rescore
  58. 2026-08-04 10:38 UTCEPSS rescore
  59. 2026-08-03 13:44 UTCEG score recompute
  60. 2026-08-03 13:44 UTCVendor advisory
  61. 2026-08-03 12:50 UTCEG score recompute
  62. 2026-08-03 12:50 UTCVendor advisory
  63. 2026-08-03 10:36 UTCEPSS rescore
  64. 2026-08-02 17:47 UTCEG score recompute
  65. 2026-08-02 17:47 UTCVendor advisory
  66. 2026-08-02 02:27 UTCEPSS rescore
  67. 2026-08-01 04:16 UTCEPSS rescore
  68. 2026-07-30 16:28 UTCEPSS rescore
  69. 2026-07-30 01:30 UTCEPSS rescore
  70. 2026-07-28 15:36 UTCEPSS rescore
  71. 2026-07-27 13:31 UTCEG score recompute
  72. 2026-07-27 13:31 UTCVendor advisory
  73. 2026-07-27 12:41 UTCEG score recompute
  74. 2026-07-27 12:41 UTCVendor advisory
  75. 2026-07-26 14:54 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-31812?
CVE-2026-31812 is a medium vulnerability published on March 10, 2026. 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…
When was CVE-2026-31812 disclosed?
CVE-2026-31812 was first published in the National Vulnerability Database on March 10, 2026, with the most recent update on August 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-31812 actively exploited?
CVE-2026-31812 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 58.1% of all scored CVEs.
What is the CVSS score of CVE-2026-31812?
CVE-2026-31812 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-31812?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-31812, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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