Echo: liburi-perl: security update to 5.30-1+e1

medium Tenable Self-Hosted Container Security Plugin ID 459921

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

- URI versions before 5.36 for Perl encode non-NFC host names to non-standard punycode labels via missing
normalization in nameprep. nameprep lowercases each host label but performs no Unicode normalization. IDNA
requires a label to be normalized to Form C before it is encoded (RFC 5891), so a label that is not
already in NFC is encoded to a different A-label than its normalized form. A label built from the
precomposed Devanagari sequence U+0958 U+093E encodes to xn--72b5c without normalization but to xn--11b2fg
after NFC normalization, and xn--72b5c does not round-trip back to the original label. Any caller that
reads host() from a URI built from untrusted input and uses it for a security decision (an allow or deny
list, an SSRF filter, deduplication, a cache key) sees the non-standard label, while a client that fetches
the same URL resolves the NFC form, so the check and the fetch can disagree about the host.
(CVE-2026-19953)

Solution

Update the liburi-perl library and its related packages to version 5.30-1+e1 or later.

Plugin Details

Severity: Medium

ID: 459921

Version: Revision 1.1

Type: Local

Family: Echo Local Security Checks

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Low

Score: 2.1

Percentile: 8.12

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 4.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:N

CVSS Score Source: CVE-2026-19953

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 8/26/2026

Vulnerability Publication Date: 8/21/2026

Reference Information

CVE: CVE-2026-19953

Detections

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