CVE-2026-33811

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-05-07. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — Patch released this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

When using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
55%
KEV
Not listed

Published

May 7, 2026

Last Modified

September 18, 2026

Advisory Details (4)

Auto-updated May 12, 2026
No patch confirmed yet.
generic

GO-2026-4981 - Go Packages

https://pkg.go.dev/vuln/GO-2026-4981
generic
https://groups.google.com/g/golang-announce/c/qcCIEXso47M
generic

net: double-free of cgo pointer when handling long CNAME response · Issue #78803 · golang/go · GitHub

https://go.dev/issue/78803
generic
https://go.dev/cl/767860

Vendor Advisories for CVE-2026-33811(20)

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

Patch Availability(30)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatgit-lfs-0:3.6.1-2.el9_6.72026-09-14redhat
redhatgit-lfs-0:3.6.1-2.el10_0.72026-09-14redhat
redhatgit-lfs-0:3.2.0-2.el9_2.102026-09-14redhat
redhatoadp/oadp-velero-rhel9:17888604612026-09-09redhat
redhatimage-builder-0:52.1-1.el9_8.22026-09-09redhat
redhatrhoai/odh-trustyai-service-operator-rhel9:17873300732026-09-08redhat
redhatimage-builder-0:52.1-1.el10_2.22026-09-08redhat
redhatopenshift4/ose-ansible-rhel9-operator:17875543472026-09-03redhat
redhatose-gcp-gcr-image-credential-provider-0:4.17.0-202608122146.p2.g8ce997d.assembly.stream.el82026-09-03redhat
redhatgolang-0:1.26.5-1.el9_22026-08-31redhat
redhatrhc-1:0.3.2-6.el10_02026-08-31redhat
redhatrhoai/odh-workload-variant-autoscaler-controller-rhel9:17875622002026-08-27redhat
redhatopenshift4/ose-sdn-rhel8:17870028072026-08-26redhat
redhatopenshift4/ose-ansible-rhel9-operator:17867544252026-08-26redhat
redhatrhoso-operators/sg-core-rhel9:17866126622026-08-26redhat
redhatose-gcp-gcr-image-credential-provider-0:4.16.0-202608111505.p2.g26b43df.assembly.stream.el82026-08-26redhat
redhatopenshift4/ose-sdn-rhel9:17870551352026-08-26redhat
redhatopenshift4/ose-ansible-operator:17870018632026-08-26redhat
redhatose-gcp-gcr-image-credential-provider-0:4.18.0-202608121933.p2.g6ea2356.assembly.stream.el82026-08-26redhat
redhatopenshift4/ose-ansible-operator:17870280972026-08-26redhat
redhatose-aws-ecr-image-credential-provider-0:4.14.0-202608131802.p2.g9a7820e.assembly.stream.el82026-08-26redhat
redhatopenshift4/ose-ansible-rhel9-operator:17867883312026-08-26redhat
redhatose-gcp-gcr-image-credential-provider-0:4.15.0-202608131733.p2.gfc50272.assembly.stream.el82026-08-26redhat
redhatmulticluster-engine/discovery-rhel9:17866585192026-08-25redhat
redhatoadp/oadp-velero-rhel9:17869445402026-08-25redhat
redhatgolang-0:1.26.5-1.el9_42026-08-20redhat
redhatrhacm2/klusterlet-addon-controller-rhel9:17869083012026-08-19redhat
redhatose-aws-ecr-image-credential-provider-0:4.19.0-202608111604.p2.g425c1c5.assembly.stream.el92026-08-19redhat
redhatopenshift4/ose-ansible-rhel9-operator:17864907452026-08-19redhat
redhatmulticluster-engine/work-rhel9:17869072762026-08-19redhat

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

(6 across 5 ecosystems)
Debian:14(2)
PackageVulnerable rangeFixed inDependents
golang-1.251.25.0-1 ... 1.25.9-1 (11 versions)1.25.10-1—
golang-1.261.26.0-1 ... 1.26~rc3-2 (9 versions)1.26.3-1—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
golang-1.151.15.15-1 ... 1.15.9-6 (10 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
golang-1.191.19.10-1 ... 1.19.9-1 (12 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
golang-1.241.24.12-1 ... 1.24.9-1 (10 versions)——
Go(1)
PackageVulnerable rangeFixed inDependents
stdlib—1.26.3—

Weakness Classification(2)

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

All Vendor Advisories

(25)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 22× in last 7d / 116× 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 422 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-33811?
CVE-2026-33811 is a high vulnerability published on May 7, 2026. When using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash.
When was CVE-2026-33811 disclosed?
CVE-2026-33811 was first published in the National Vulnerability Database on May 7, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-33811 actively exploited?
CVE-2026-33811 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 44.5% of all scored CVEs.
What is the CVSS score of CVE-2026-33811?
CVE-2026-33811 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-33811?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-33811, 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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