CVE-2026-33267

CRITICALNVD 9.110.0▲
EchelonGraph scoreMEDIUM confidence

Score 10.0 from GitHub Security Advisory (severity: HIGH) published 2026-07-29. NVD baseline CVSS 9.1; sources differ by 0.9.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this weekElevated
10.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.1Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Improper Input Validation vulnerability in Apache Traffic Server.

This issue affects Apache Traffic Server: from 9.2.0 through 9.2.14, from 10.1.0 through 10.1.3.

Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fixes the issue.

CVSS v3
9.1
EG Score
10.0(medium)
EG Risk
76(Track)
EG Risk 76/100SSVC: 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
Severity100% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
30%
KEV
Not listed

Published

July 29, 2026

Last Modified

August 5, 2026

Advisory Details (1)

Auto-updated Aug 29, 2026
No patch confirmed yet.
generic
https://lists.apache.org/thread/5prl9glcm9g2swnq9hqxvnokylm1gr6d

Vendor Advisories for CVE-2026-33267(1)

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

Affected Packages

(2 across 2 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
trafficserver8.1.1+ds-1.1 ... 9.2.5+ds-1 (40 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
trafficserver9.2.0+ds-2 ... 9.2.5+ds-1 (14 versions)——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 41× in last 7d / 213× 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 240 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCBoreas37/CVE-2026-33267-PoC
    First seen Aug 12, 2026

    CVE-2026-33267 — Apache Traffic Server @ header internal-metadata spoof (CVSS 10.0). Verified: @ headers leak to plugins on 10.1.2, stripped on 10.1.4

    Open source ↗

Frequently asked(5)

What is CVE-2026-33267?
CVE-2026-33267 is a critical vulnerability published on July 29, 2026. Improper Input Validation vulnerability in Apache Traffic Server. This issue affects Apache Traffic Server: from 9.2.0 through 9.2.14, from 10.1.0 through 10.1.3. Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fixes the issue.
When was CVE-2026-33267 disclosed?
CVE-2026-33267 was first published in the National Vulnerability Database on July 29, 2026, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-33267 actively exploited?
CVE-2026-33267 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 69.6% of all scored CVEs.
What is the CVSS score of CVE-2026-33267?
CVE-2026-33267 has a CVSS v3 base score of 9.1 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 10.0.
How do I remediate CVE-2026-33267?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-33267, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-33267

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