CVE-2025-52936

Improper Link Resolution Before File Access vulnerability in yrutschle/sslh

9.3 CriticalFix available

Improper Link Resolution Before File Access ('Link Following') vulnerability in yrutschle sslh.This issue affects sslh: before 2.2.2.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: Low

Exploit likelihood

0.20%Up 0.2 points since Jun 23, 2025

What each source reports

CVE List Score used 9.3

Improper Link Resolution Before File Access vulnerability in yrutschle/sslh

Improper Link Resolution Before File Access ('Link Following') vulnerability in yrutschle sslh.This issue affects sslh: before 2.2.2.

Record: CVE-2025-52936
CVSS 4.0: 9.3 CriticalCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/S:N/AU:Y/R:U/V:C/RE:M/U:Amber
Weakness: CWE-59
Updated: 2026-11-02

EUVDEUVD-2025-28479 9.3

Improper Link Resolution Before File Access ('Link Following') vulnerability in yrutschle sslh.This issue affects sslh: before 2.2.2.

Record: EUVD-2025-28479
CVSS 4.0: 9.3 CriticalCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/S:N/AU:Y/R:U/V:C/RE:M/U:Amber
Updated: 2026-11-02

GitHub AdvisoriesGHSA-7wr7-q3ph-825q 9.3

Improper Link Resolution Before File Access ('Link Following') vulnerability in yrutschle sslh...

Improper Link Resolution Before File Access ('Link Following') vulnerability in yrutschle sslh.This issue affects sslh: before 2.2.2.

Record: GHSA-7wr7-q3ph-825q
CVSS 4.0: 9.3 CriticalCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:N/AU:Y/R:U/V:C/RE:M/U:Amber
Weakness: CWE-59
Updated: 2026-11-02

NVD 9.3

Improper Link Resolution Before File Access ('Link Following') vulnerability in yrutschle sslh.This issue affects sslh: before 2.2.2.

Record: CVE-2025-52936
CVSS 4.0: 9.3 CriticalCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:N/AU:Y/R:U/V:C/RE:M/U:Amber
Weakness: CWE-59
Updated: 2026-11-02

OSV 9.3

Improper Link Resolution Before File Access vulnerability in yrutschle/sslh

Improper Link Resolution Before File Access ('Link Following') vulnerability in yrutschle sslh.This issue affects sslh: before 2.2.2.

Record: CVE-2025-52936
CVSS 4.0: 9.3 CriticalCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/S:N/AU:Y/R:U/V:C/RE:M/U:Amber
Weakness: CWE-59
Updated: 2026-11-02

OSVDEBIAN-CVE-2025-52936 9.3

Improper Link Resolution Before File Access ('Link Following') vulnerability in yrutschle sslh.This issue affects sslh: before 2.2.2.

Record: DEBIAN-CVE-2025-52936
CVSS 4.0: 9.3 CriticalCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:N/AU:Y/R:U/V:C/RE:M/U:Amber
Updated: 2026-11-02

OSVUBUNTU-CVE-2025-52936 9.3

Improper Link Resolution Before File Access ('Link Following') vulnerability in yrutschle sslh.This issue affects sslh: before 2.2.2.

Record: UBUNTU-CVE-2025-52936
CVSS 4.0: 9.3 CriticalCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/S:N/AU:Y/R:U/V:C/RE:M/U:Amber
Updated: 2026-11-02

OSVMGASA-2026-0227 No score

Updated sslh packages fix security vulnerabilities

CVE-2025-46806, A Use of Out-of-range Pointer Offset vulnerability in sslh leads to denial of service on some architectures CVE-2025-46807, A Allocation of Resources Without Limits or Throttling vulnerability in sslh allows attackers to easily exhaust the file descriptors in sslh and deny legitimate users service. CVE-2025-52936, Improper Link Resolution Before File Access ('Link Following') vulnerability in yrutschle sslh

Record: MGASA-2026-0227
Updated: 2026-11-02

OSVUSN-8360-1 No score

sslh vulnerability

It was discovered that sslh did not properly handle symbolic links when writing its PID file. A local attacker could possibly use this issue to overwrite arbitrary files.

Record: USN-8360-1
Updated: 2026-11-02

Affected products

yrutschle sslh

Affected packages

Affected packages
Package	Affected	Fixed
`sslh` Debian:12	before 1.20-1+deb12u1, plus listed versions 1.20-1	1.20-1+deb12u1
`sslh` Debian:13	All versions, plus listed versions 2.1.4-12.3.1-1	None known
`sslh` Debian:14	before 2.3.1-1, plus listed versions 2.1.4-1	2.3.1-1
`sslh` Debian:11	before 1.20-1+deb11u1, plus listed versions 1.20-1	1.20-1+deb11u1
`sslh` Mageia:9 From an advisory covering 3 CVEs	before 2.3.1-1.1.mga9	2.3.1-1.1.mga9
`sslh` Ubuntu:Pro:16.04:LTS	before 1.17-2ubuntu0.1~esm1, plus listed versions 1.17-2	1.17-2ubuntu0.1~esm1
`sslh` Ubuntu:Pro:18.04:LTS	before 1.18-1ubuntu0.1~esm1, plus listed versions 1.18-1	1.18-1ubuntu0.1~esm1
`sslh` Ubuntu:Pro:20.04:LTS	All versions, plus listed versions 1.18-11.20-11.20-1+deb11u1build0.20.04.1	None known
`sslh` Ubuntu:22.04:LTS	before 1.20-1+deb11u1build0.22.04.1, plus listed versions 1.20-1	1.20-1+deb11u1build0.22.04.1
`sslh` Ubuntu:Pro:24.04:LTS	before 1.22c-1ubuntu0.1~esm1, plus listed versions 1.20-1.11.22c-1	1.22c-1ubuntu0.1~esm1

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Affected packages
Package	Affected	Fixed
`sslh` Ubuntu:25.10	before 2.1.4-1ubuntu0.25.10.1, plus listed versions 2.1.4-1build1	2.1.4-1ubuntu0.25.10.1
`sslh` Ubuntu:26.10	All versions, plus listed versions 2.1.4-1build2	None known
`sslh` Ubuntu:26.04:LTS	before 2.1.4-1ubuntu0.26.04.1, plus listed versions 2.1.4-1build12.1.4-1build2	2.1.4-1ubuntu0.26.04.1
`sslh` Ubuntu:Pro:20.04:LTS	before 1.20-1+deb11u1build0.20.04.1, plus listed versions 1.18-11.20-1	1.20-1+deb11u1build0.20.04.1

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2025-52936 is a critical vulnerability (CVSS 9.3) in Yrutschle Sslh, published June 23, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.20%, the 9th percentile. Fixed in sslh 1.20-1+deb12u1.

References

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