CVE-2026-45135

HIGHPre-NVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 68% 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
8.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.1Exploit: NoneExposed: 0

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

Caddy is an extensible server platform that uses TLS by default. From 2.7.0 until 2.11.3, the FastCGI transport's splitPos() in modules/caddyhttp/reverseproxy/fastcgi/fastcgi.go misuses golang.org/x/text/search with search.IgnoreCase when the request path contains a non-ASCII byte. Two distinct flaws in that fallback let an attacker mislead Caddy's FastCGI splitting into treating a non-.php (or other configured split_path extension) file as a script. In any deployment where the attacker can place content into a file served via FastCGI (uploads, file storage, etc.), this can be escalated to remote code execution by crafting a URL whose path triggers either flaw. This vulnerability is fixed in 2.11.3.

CVSS v3
8.1
EG Score
8.1(medium)
EPSS
31.9%
KEV
Not listed

Published

May 18, 2026

Last Modified

June 26, 2026

Advisory Details (1)

Auto-updated Jun 23, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Unsafe Unicode Handling in FastCGI splitPos Allows Execution of Non-PHP Files · Advisory · caddyserver/caddy · GitHub

https://github.com/caddyserver/caddy/security/advisories/GHSA-m675-2p33-xv9g

Vendor Advisories for CVE-2026-45135(1)

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

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
github.com/caddyserver/caddy/v2—2.11.3—

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 39× 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.

  1. 2026-07-11 08:27 UTCEPSS rescore
  2. 2026-07-09 19:10 UTCEPSS rescore
  3. 2026-07-08 15:16 UTCEPSS rescore
  4. 2026-07-07 13:46 UTCEPSS rescore
  5. 2026-07-06 16:27 UTCEPSS rescore
  6. 2026-07-06 02:23 UTCEPSS rescore
  7. 2026-07-05 02:30 UTCEPSS rescore
  8. 2026-07-04 06:31 UTCEPSS rescore
  9. 2026-07-01 15:07 UTCEPSS rescore
  10. 2026-06-30 23:22 UTCEPSS rescore
  11. 2026-06-29 21:10 UTCEG score recompute
  12. 2026-06-29 14:06 UTCEPSS rescore
  13. 2026-06-29 14:06 UTCEPSS rescore
  14. 2026-06-28 14:07 UTCEPSS rescore
  15. 2026-06-28 10:48 UTCEG score recompute
  16. 2026-06-28 04:56 UTCEPSS rescore
  17. 2026-06-28 04:56 UTCEPSS rescore
  18. 2026-06-27 21:34 UTCEG score recompute
  19. 2026-06-27 08:45 UTCEG score recompute
  20. 2026-06-27 03:08 UTCEPSS rescore
  21. 2026-06-26 19:57 UTCEG score recompute
  22. 2026-06-25 17:48 UTCEG score recompute
  23. 2026-06-25 13:49 UTCEPSS rescore
  24. 2026-06-24 14:05 UTCEPSS rescore
  25. 2026-06-18 02:25 UTCEG score recompute
Show 35 more
  1. 2026-06-17 13:32 UTCEG score recompute
  2. 2026-06-17 00:46 UTCEG score recompute
  3. 2026-06-16 11:59 UTCEG score recompute
  4. 2026-06-15 23:13 UTCEG score recompute
  5. 2026-06-15 07:53 UTCEG score recompute
  6. 2026-06-14 23:18 UTCEPSS rescore
  7. 2026-06-14 18:25 UTCEG score recompute
  8. 2026-06-14 05:25 UTCEG score recompute
  9. 2026-06-13 23:00 UTCEPSS rescore
  10. 2026-06-13 15:03 UTCEG score recompute
  11. 2026-06-13 02:17 UTCEG score recompute
  12. 2026-06-12 23:12 UTCEPSS rescore
  13. 2026-06-12 13:30 UTCEG score recompute
  14. 2026-06-12 00:43 UTCEG score recompute
  15. 2026-06-11 11:58 UTCEG score recompute
  16. 2026-06-10 23:11 UTCEG score recompute
  17. 2026-06-10 10:26 UTCEG score recompute
  18. 2026-06-09 21:36 UTCEG score recompute
  19. 2026-06-09 08:25 UTCEG score recompute
  20. 2026-06-08 19:39 UTCEG score recompute
  21. 2026-06-08 03:08 UTCEG score recompute
  22. 2026-06-07 14:23 UTCEG score recompute
  23. 2026-06-07 01:38 UTCEG score recompute
  24. 2026-06-06 12:53 UTCEG score recompute
  25. 2026-06-06 00:07 UTCEG score recompute
  26. 2026-06-05 11:22 UTCEG score recompute
  27. 2026-06-04 22:37 UTCEG score recompute
  28. 2026-06-04 09:52 UTCEG score recompute
  29. 2026-06-03 21:06 UTCEG score recompute
  30. 2026-06-03 08:20 UTCEG score recompute
  31. 2026-06-02 19:35 UTCEG score recompute
  32. 2026-06-02 06:48 UTCEG score recompute
  33. 2026-06-01 18:02 UTCEG score recompute
  34. 2026-06-01 05:17 UTCEG score recompute
  35. 2026-05-24 06:18 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-45135?
CVE-2026-45135 is a high vulnerability published on May 18, 2026. Caddy is an extensible server platform that uses TLS by default. From 2.7.0 until 2.11.3, the FastCGI transport's splitPos() in modules/caddyhttp/reverseproxy/fastcgi/fastcgi.go misuses golang.org/x/text/search with search.IgnoreCase when the request path contains a non-ASCII byte. Two distinct…
When was CVE-2026-45135 disclosed?
CVE-2026-45135 was first published in the National Vulnerability Database on May 18, 2026, with the most recent update on June 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45135 actively exploited?
CVE-2026-45135 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 31.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-45135?
CVE-2026-45135 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-45135?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45135, 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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