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Fencer Vulns
high 7.5

CVE-2018-19052 in the critical feed json

An issue was discovered in mod_alias_physical_handler in mod_alias.c in lighttpd before 1.4.50.

published 2018-11-07 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-10769

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
13.7%
EPSS 13.7% chance of exploitation in 30 days, percentile 96%
public exploits
0
none known

Summary

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.

Patch / fix

  • lighttpd lighttpd 1.4.50
  • lighttpd Debian 14, Debian 13, Debian 12 1.4.52-1

debian advisories DEBIAN-CVE-2018-19052

  • lighttpd Ubuntu Pro 14.04 LTS 1.4.33-1+nmu2ubuntu2.1+esm1
  • lighttpd Ubuntu Pro 16.04 LTS 1.4.35-4ubuntu2.1+esm1
  • lighttpd Ubuntu Pro 18.04 LTS 1.4.45-1ubuntu3.18.04.1+esm1

ubuntu advisories UBUNTU-CVE-2018-19052

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • lighttpd openSUSE Tumbleweed 1.4.59-2.1
  • lighttpd Package Hub 15 SP1, Package Hub 15, openSUSE Leap 15.1 +1 more 1.4.54-bp151.4.3.1

opensuse advisories openSUSE-SU-2024:10585-1openSUSE-SU-2019:2347-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-19052 updated cvss 5.4

lighttpd: path traversal in mod_alias_physical_handler in mod_alias.c

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

13.71% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/lighttpd/lighttpd1.4/commit/2105dae0f9d7a964375ce681e53cb165375f84c1 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N

Classification

Weakness
  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.