Log in Start free

Vulnerability · Published Jul 7, 2026 · Assigned by CPANSec

CVE-2026-14895String::Util versions before 1.36 for Perl are susceptible to a regular expression denial of service

High 7.5

In plain English

A high-severity regular-expression denial of service in String::Util from BAKERSCOT. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.6%top 49.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

String::Util versions before 1.36 for Perl are susceptible to a regular expression denial of service. The trim and rtrim functions stripped trailing whitespace with s/\s*$//u. Because \s* matches greedily and the $ anchor fails whenever a non-whitespace character follows the whitespace, the regex engine retries the match at each offset of a long whitespace run, producing quadratic backtracking. The fix replaces \s*$ with \s+$. Any caller that passes untrusted input to trim or rtrim can trigger CPU exhaustion with a string containing a long run of whitespace.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12libstring-util-perlno fix listedDEBIAN-CVE-2026-14895
Debian:13libstring-util-perlno fix listedDEBIAN-CVE-2026-14895
Debian:14libstring-util-perl1.36-1DEBIAN-CVE-2026-14895
Ubuntu:24.04:LTSlibstring-util-perlno fix listedUBUNTU-CVE-2026-14895
Ubuntu:25.10libstring-util-perlno fix listedUBUNTU-CVE-2026-14895
Ubuntu:26.04:LTSlibstring-util-perlno fix listedUBUNTU-CVE-2026-14895
Ubuntu:26.10libstring-util-perlno fix listedUBUNTU-CVE-2026-14895

Affected products (as reported)

VendorProductVersions
BAKERSCOT String::Util 0 – before 1.36

Weakness: CWE-1333 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References