CVE-2026-34475

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 90% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0

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

Varnish Cache before 8.0.1 and Varnish Enterprise before 6.0.16r12, in certain unchecked req.url scenarios, mishandle URLs with a path of / for HTTP/1.1, potentially leading to cache poisoning or authentication bypass.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: 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
Severity98% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
10%
KEV
Not listed

Published

March 27, 2026

Last Modified

June 17, 2026

Advisory Details (1)

Auto-updated Sep 14, 2026
No patch confirmed yet.
generic

VSV00018 Varnish Cache absolute form parsing deficiency - Vinyl Cache

https://vinyl-cache.org/security/VSV00018.html

Affected Packages

(3 across 3 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
varnish6.5.1-1 ... 7.7.3-3 (30 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
varnish7.1.1-1.1 ... 7.7.3-3 (20 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
varnish7.7.0-3 ... 7.7.3-3 (8 versions)——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 27× 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 203 total refreshes for this CVE.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 19:28 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. 2026-09-15 03:11 UTCEPSS rescore
  7. 2026-09-13 16:47 UTCEPSS rescore
  8. 2026-09-12 15:01 UTCEPSS rescore
  9. 2026-09-11 14:53 UTCEPSS rescore
  10. 2026-09-11 09:37 UTCEPSS rescore
  11. 2026-09-10 09:34 UTCEPSS rescore
  12. 2026-09-08 22:00 UTCEPSS rescore
  13. 2026-09-07 16:01 UTCEPSS rescore
  14. 2026-09-06 13:47 UTCEPSS rescore
  15. 2026-09-04 05:06 UTCEPSS rescore
  16. 2026-09-02 14:12 UTCEPSS rescore
  17. 2026-09-01 13:53 UTCEPSS rescore
  18. 2026-09-01 04:39 UTCEPSS rescore
  19. 2026-08-30 19:17 UTCEPSS rescore
  20. 2026-08-30 01:22 UTCEPSS rescore
  21. 2026-08-28 21:41 UTCEPSS rescore
  22. 2026-08-27 14:25 UTCEPSS rescore
  23. 2026-08-26 14:46 UTCEPSS rescore
  24. 2026-08-23 00:19 UTCEPSS rescore
  25. 2026-08-21 23:49 UTCEPSS rescore
Show 75 more
  1. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-20 22:55 UTCEPSS rescore
  3. 2026-08-19 17:03 UTCEPSS rescore
  4. 2026-08-18 13:48 UTCEPSS rescore
  5. 2026-08-17 13:47 UTCEPSS rescore
  6. 2026-08-16 14:56 UTCEPSS rescore
  7. 2026-08-16 09:57 UTCEG score recompute
  8. 2026-08-16 09:57 UTCGHSA enrichment
  9. 2026-08-16 02:14 UTCEPSS rescore
  10. 2026-08-15 01:30 UTCEPSS rescore
  11. 2026-08-14 22:49 UTCGHSA enrichment
  12. 2026-08-14 19:11 UTCGHSA enrichment
  13. 2026-08-14 13:33 UTCGHSA enrichment
  14. 2026-08-14 09:55 UTCGHSA enrichment
  15. 2026-08-14 06:16 UTCEG score recompute
  16. 2026-08-14 06:16 UTCGHSA enrichment
  17. 2026-08-13 22:00 UTCEPSS rescore
  18. 2026-08-13 03:52 UTCGHSA enrichment
  19. 2026-08-13 00:13 UTCGHSA enrichment
  20. 2026-08-12 20:34 UTCEG score recompute
  21. 2026-08-12 20:34 UTCGHSA enrichment
  22. 2026-08-12 13:50 UTCEPSS rescore
  23. 2026-08-12 00:45 UTCGHSA enrichment
  24. 2026-08-11 20:43 UTCEG score recompute
  25. 2026-08-11 20:43 UTCGHSA enrichment
  26. 2026-08-11 07:24 UTCGHSA enrichment
  27. 2026-08-11 03:46 UTCEG score recompute
  28. 2026-08-11 03:45 UTCGHSA enrichment
  29. 2026-08-11 00:00 UTCEPSS rescore
  30. 2026-08-10 12:00 UTCGHSA enrichment
  31. 2026-08-10 07:23 UTCGHSA enrichment
  32. 2026-08-10 03:45 UTCGHSA enrichment
  33. 2026-08-10 00:06 UTCGHSA enrichment
  34. 2026-08-09 20:26 UTCGHSA enrichment
  35. 2026-08-09 16:48 UTCEG score recompute
  36. 2026-08-09 16:48 UTCGHSA enrichment
  37. 2026-08-09 13:46 UTCEPSS rescore
  38. 2026-08-09 13:04 UTCGHSA enrichment
  39. 2026-08-09 05:49 UTCGHSA enrichment
  40. 2026-08-08 10:29 UTCGHSA enrichment
  41. 2026-08-08 06:51 UTCGHSA enrichment
  42. 2026-08-08 03:12 UTCGHSA enrichment
  43. 2026-08-07 23:33 UTCGHSA enrichment
  44. 2026-08-07 19:54 UTCEG score recompute
  45. 2026-08-07 19:54 UTCGHSA enrichment
  46. 2026-08-07 16:16 UTCGHSA enrichment
  47. 2026-08-06 18:39 UTCEG score recompute
  48. 2026-08-06 18:39 UTCGHSA enrichment
  49. 2026-08-06 13:46 UTCEPSS rescore
  50. 2026-08-06 08:26 UTCGHSA enrichment
  51. 2026-08-06 04:24 UTCGHSA enrichment
  52. 2026-08-06 00:45 UTCEG score recompute
  53. 2026-08-06 00:45 UTCGHSA enrichment
  54. 2026-08-05 19:17 UTCEPSS rescore
  55. 2026-08-04 15:10 UTCEPSS rescore
  56. 2026-08-04 10:38 UTCEPSS rescore
  57. 2026-08-04 03:56 UTCGHSA enrichment
  58. 2026-08-03 23:06 UTCEG score recompute
  59. 2026-08-03 23:06 UTCGHSA enrichment
  60. 2026-08-03 10:36 UTCEPSS rescore
  61. 2026-08-03 02:24 UTCGHSA enrichment
  62. 2026-08-02 22:27 UTCGHSA enrichment
  63. 2026-08-02 18:49 UTCGHSA enrichment
  64. 2026-08-02 15:10 UTCEG score recompute▲ 4.40
  65. 2026-08-02 15:10 UTCGHSA enrichment
  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. 2026-07-27 14:13 UTCEPSS rescore
  71. 2026-07-26 14:54 UTCEPSS rescore
  72. 2026-07-26 14:54 UTCEPSS rescore
  73. 2026-07-25 14:18 UTCEPSS rescore
  74. 2026-07-25 14:18 UTCEPSS rescore
  75. 2026-07-24 14:17 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-34475?
CVE-2026-34475 is a critical vulnerability published on March 27, 2026. Varnish Cache before 8.0.1 and Varnish Enterprise before 6.0.16r12, in certain unchecked req.url scenarios, mishandle URLs with a path of / for HTTP/1.1, potentially leading to cache poisoning or authentication bypass.
When was CVE-2026-34475 disclosed?
CVE-2026-34475 was first published in the National Vulnerability Database on March 27, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-34475 actively exploited?
CVE-2026-34475 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 89.6% of all scored CVEs.
What is the CVSS score of CVE-2026-34475?
CVE-2026-34475 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-34475?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-34475, 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.

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