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

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-14895
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-07 23:16:54 UTC
Updated2026-07-08 15:56:29 UTC
DescriptionString::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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-1333 | CWE-1333 CWE-1333 Inefficient Regular Expression Complexity

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA BAKERSCOT StringUtil affected 1.36 custom Not specified

References

ReferenceSourceLinkTags
metacpan.org/release/BAKERSCOT/String-Util-1.36/diff/BAKERSCOT/String-Util... 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
github.com/scottchiefbaker/String-Util/commit/f8150867aaeb8f57c59601aefb... 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
www.openwall.com/lists/oss-security/2026/07/07/18 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
github.com/scottchiefbaker/String-Util/releases 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Solutions

CNA: Upgrade to version 1.36 or later.

Workarounds

CNA: For deployments that cannot upgrade, enforce a maximum length on strings before passing them to the trim and rtrim functions. Note that the HTML form field maxlength attribute is only enforced client-side.

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