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Debian dsa-6429 : caddy - security update
critical Nessus Plugin ID 334443
Synopsis
The remote Debian host is missing one or more security-related updates.Description
The remote Debian 13 host has a package installed that is affected by multiple vulnerabilities as referenced in the dsa-6429 advisory.- ------------------------------------------------------------------------- Debian Security Advisory DSA-6429-1 [email protected] https://www.debian.org/security/ Aron Xu August 11, 2026 https://www.debian.org/security/faq
- -------------------------------------------------------------------------
Package : caddy CVE ID : CVE-2026-27585 CVE-2026-27587 CVE-2026-27588 CVE-2026-27589 CVE-2026-27590 CVE-2026-45692 CVE-2026-52845 CVE-2026-52846
Multiple security issues were discovered in Caddy, a web server with automatic HTTPS, which may result in the bypass of path- or host-based access controls, the execution of an unintended file by a FastCGI backend, the injection of identity headers trusted by applications running behind Caddy, unauthorised reconfiguration of the server through its admin API, or cross-site scripting.
The fix for CVE-2026-52845 follows upstream in dropping every request header whose name contains an underscore, for all servers and without an opt-out. Deployments which pass such headers through Caddy, for instance X_Api_Key or gRPC custom metadata keys containing underscores, need to switch to the hyphenated spelling.
For the stable distribution (trixie), these problems have been fixed in version 2.6.2-12+deb13u1.
We recommend that you upgrade your caddy packages.
For the detailed security status of caddy please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/caddy
Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/
Mailing list: [email protected]
Tenable has extracted the preceding description block directly from the Debian security advisory.
Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.
Solution
Upgrade the caddy packages.See Also
https://packages.debian.org/source/trixie/caddy
https://security-tracker.debian.org/tracker/CVE-2026-27585
https://security-tracker.debian.org/tracker/CVE-2026-27587
https://security-tracker.debian.org/tracker/CVE-2026-27588
https://security-tracker.debian.org/tracker/CVE-2026-27589
https://security-tracker.debian.org/tracker/CVE-2026-27590
https://security-tracker.debian.org/tracker/CVE-2026-45692
https://security-tracker.debian.org/tracker/CVE-2026-52845
https://security-tracker.debian.org/tracker/CVE-2026-52846
https://security-tracker.debian.org/tracker/source-package/caddy
Plugin Details
Severity: Critical
ID: 334443
File Name: debian_DSA-6429.nasl
Version: 1.1
Type: Local
Agent: unix
Family: Debian Local Security Checks
Published: 8/11/2026
Updated: 8/11/2026
Supported Sensors: Nessus Agent, Continuous Assessment, Nessus
Risk Information
VPR
Risk Factor: High
Score: 7.6
Percentile: 98.48
CVSS v2
Risk Factor: Critical
Base Score: 10
Temporal Score: 7.8
Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C
CVSS Score Source: CVE-2026-27590
CVSS v3
Risk Factor: Critical
Base Score: 9.8
Temporal Score: 8.8
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C
CVSS v4
Risk Factor: Critical
Base Score: 9.3
Threat Score: 8.1
Threat Vector: CVSS:4.0/E:P
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Vulnerability Information
CPE: cpe:/o:debian:debian_linux:13.0, p-cpe:/a:debian:debian_linux:caddy
Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 8/11/2026
Vulnerability Publication Date: 2/24/2026
Reference Information
CVE: CVE-2026-27585, CVE-2026-27587, CVE-2026-27588, CVE-2026-27589, CVE-2026-27590, CVE-2026-45692, CVE-2026-52845, CVE-2026-52846