CVE-2018-19052

CVE-2018-19052 is a high-severity vulnerability in Lighttpd with a CVSS 3.x base score of 7.5. Its EPSS exploit-prediction score of 14% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-22.

Key facts

• Severity: High (CVSS 3.x base score 7.5)
• CVSS v2: 5.0
• EPSS exploit prediction: 14% (96th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-22
• Affected product: Lighttpd
• Published: 2018-11-07
• Last modified: 2026-06-17

Description

An issue was discovered in mod_alias_physical_handler in mod_alias.c in lighttpd before 1.4.50. There is potential ../ path traversal of a single directory above an alias target, with a specific mod_alias configuration where the matched alias lacks a trailing '/' character, but the alias target filesystem path does have a trailing '/' character.

Frequently asked questions

What is CVE-2018-19052?

An issue was discovered in mod_alias_physical_handler in mod_alias.c in lighttpd before 1.4.50. There is potential ../ path traversal of a single directory above an alias target, with a specific mod_alias configuration where the matched alias lacks a trailing '/' character, but the alias target filesystem path does have a trailing '/' character.

How severe is CVE-2018-19052?

CVE-2018-19052 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2018-19052 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 14% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-19052?

CVE-2018-19052 primarily affects Lighttpd. In total, 13 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-19052?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2018-19052 published?

CVE-2018-19052 was published on 2018-11-07 and last updated on 2026-06-17.

References

• http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00054.html
• https://github.com/lighttpd/lighttpd1.4/commit/2105dae0f9d7a964375ce681e53cb165375f84c1
• https://lists.debian.org/debian-lts-announce/2022/01/msg00012.html

Affected products (13)

• cpe:2.3:a:lighttpd:lighttpd:*:*:*:*:*:*:*:*
• cpe:2.3:a:opensuse:backports_sle:15.0:-:*:*:*:*:*:*
• cpe:2.3:a:opensuse:backports_sle:15.0:sp1:*:*:*:*:*:*
• cpe:2.3:o:opensuse:leap:15.0:*:*:*:*:*:*:*
• cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_server:11:sp3:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_server:11:sp4:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_server:12:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_server:12:sp1:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_server:12:sp2:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_server:12:sp3:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_server:12:sp4:*:*:*:*:*:*
• cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

More vulnerabilities in Lighttpd

• CVE-2019-11072 — Critical (CVSS 9.8): lighttpd before 1.4.54 has a signed integer overflow, which might allow remote attackers to cause a denial of service…
• CVE-2014-2323 — Critical (CVSS 9.8): SQL injection vulnerability in mod_mysql_vhost.c in lighttpd before 1.4.35 allows remote attackers to execute arbitrary…
• CVE-2025-12642 — Critical (CVSS 9.1): lighttpd1.4.80 incorrectly merged trailer fields into headers after http request parsing. This behavior can be…
• CVE-2007-3949 — High (CVSS 8.3): mod_access.c in lighttpd 1.4.15 ignores trailing / (slash) characters in the URL, which allows remote attackers to…
• CVE-2007-1870 — High (CVSS 7.8): lighttpd before 1.4.14 allows attackers to cause a denial of service (crash) via a request to a file whose mtime is 0,…
• CVE-2013-4559 — High (CVSS 7.6): lighttpd before 1.4.33 does not check the return value of the (1) setuid, (2) setgid, or (3) setgroups functions, which…

All CVEs affecting Lighttpd →

Other CWE-22 (Path Traversal) vulnerabilities

• CVE-2026-48282 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Limitation of a Pathname to a Restricted…
• CVE-2026-54917 — Critical (CVSS 10.0): SeaweedFS is a distributed storage system for object storage (S3), file systems, and Iceberg tables. Prior to 4.30, the…
• CVE-2026-11429 — Critical (CVSS 10.0): Two endpoints in the Vault Service ScriptsController, shared by Altium Enterprise Server and Altium 365, accept file…
• CVE-2026-34909 — Critical (CVSS 10.0): A malicious actor with access to the network could exploit a Path Traversal vulnerability found in UniFi OS devices to…
• CVE-2026-7411 — Critical (CVSS 10.0): In Eclipse BaSyx Java Server SDK versions prior to 2.0.0-milestone-10, inadequate path normalization in the Submodel…
• CVE-2026-36767 — Critical (CVSS 10.0): A path traversal vulnerability in the /content/images/add endpoint of shopizer v3.2.5 allows attackers write arbitrary…

Browse all CWE-22 (Path Traversal) vulnerabilities →

Threat intelligence

Threat-intel indicators referencing this CVE:

• 65.20.174.49 (ipv4-addr)
• 65.20.158.10 (ipv4-addr)
• 64.53.7.231 (ipv4-addr)
• 111.70.9.143 (ipv4-addr)
• 102.53.15.18 (ipv4-addr)
• 102.53.15.17 (ipv4-addr)
• 196.0.113.110 (ipv4-addr)
• 65.20.187.47 (ipv4-addr)