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CVE-2026-45135

Caddyserver Caddy remote code execution

8.1 HIGHPublic exploitEPSS 0.68%
  1. Published23 Jun 2026

Description

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 3.1 breakdown

Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Caddyserver Caddy≥ 2.7.0 < 2.11.3

Remediation

Fixed in
Caddyserver Caddy≥ 2.11.3

References

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Frequently asked

Is CVE-2026-45135 being actively exploited?

CVE-2026-45135 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.68%.

How severe is CVE-2026-45135?

CVE-2026-45135 has a CVSS 3.1 base score of 8.1, rated high. EPSS estimates a 0.68% probability of exploitation.

Which products are affected by CVE-2026-45135?

Affected products include Caddyserver Caddy.

How do I fix CVE-2026-45135?

Upgrade affected software to a fixed version, for example Caddyserver Caddy 2.11.3 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-45135 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.