CVE-2026-14895
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk50th percentile - higher than 50% of all known CVEs
Summary
A vulnerability in the String::Util library for Perl before version 1.36 allows a Regular Expression Denial of Service (ReDoS) attack. The trim and rtrim functions use the regular expression s/\s*$//u, which causes quadratic backtracking on long whitespace strings, leading to CPU exhaustion.
Risk Assessment
The organization is at risk of a DoS attack if it processes untrusted input using the trim or rtrim functions. An attacker can send a string containing a long whitespace sequence, causing high CPU load and potentially disrupting application availability.
Recommendation
Immediately update the String::Util library to version 1.36 or later. If an update is not possible, restrict processing of untrusted data by trim and rtrim functions or implement a custom whitespace removal routine.
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Original NVD description (English source)
String::Util versions before 1.36 for Perl are susceptible to a regular expression denial of service. The trim and rtrim functions stripped trailing whitespace with s/\s*$//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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS