CVE-2026-9641

#!/usr/bin/env perl # CVE-2026-9641 PoC - Demonstrating weak default PBKDF2 configuration # This PoC shows how weak parameters make password cracking easier use strict; use warnings; use Crypt::PBKDF2; use Time::HiRes qw(gettimeofday tv_interval); print "=== CVE-2026-9641 PoC: Weak Crypt::PBKDF2 Defaults ===\n\n"; # Create PBKDF2 hasher with VULNERABLE defaults (versions < 0.261630) my $pbkdf2 = Crypt::PBKDF2->new( hash_class => 'HMACSHA1', # Weak algorithm iterations => 1000, # Low iteration count output_len => 32, ); # Simulate password hashing my $password = 'Password123!'; my $start_time = [gettimeofday]; my $hash = $pbkdf2->generate($password); my $elapsed = tv_interval($start_time) * 1000; print "[VULNERABLE] Hash generated with weak defaults:\n"; print " Algorithm: HMAC-SHA1\n"; print " Iterations: 1000\n"; print " Time: ${elapsed}ms\n"; print " Hash: $hash\n\n"; # Compare with SECURE configuration my $secure_pbkdf2 = Crypt::PBKDF2->new( hash_class => 'HMACSHA2', # Strong algorithm iterations => 600000, # OWASP 2023 recommended output_len => 32, ); $start_time = [gettimeofday]; my $secure_hash = $secure_pbkdf2->generate($password); $elapsed = tv_interval($start_time) * 1000; print "[SECURE] Hash generated with recommended settings:\n"; print " Algorithm: HMAC-SHA2\n"; print " Iterations: 600000\n"; print " Time: ${elapsed}ms\n"; print " Hash: $secure_hash\n\n"; print "Note: The vulnerable configuration is 600x faster to crack!\n";

{"cve": {"id": "CVE-2026-9641", "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "published": "2026-06-12T16:16:35.047", "lastModified": "2026-06-13T04:17:35.580", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Crypt::PBKDF2 versions before 0.261630 for Perl have a weak default algorithm and number of iterations.\n\nThe default algorithm is HMAC-SHA1, which should only be used for legacy systems.\n\nThese versions default to using 1000 iterations.\n\nDepending on the chosen algorithm, 220,000 to 1,400,000 iterations should be used."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 1.4}]}, "weaknesses": [{"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-916"}]}], "references": [{"url": "https://cheatsheetseries.owasp.org/cheatsheets/Password_Storage_Cheat_Sheet.html#pbkdf2", "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"}, {"url": "https://metacpan.org/release/ARODLAND/Crypt-PBKDF2-0.261630/changes", "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"}, {"url": "http://www.openwall.com/lists/oss-security/2026/06/12/5", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "http://www.openwall.com/lists/oss-security/2026/06/13/1", "source": "af854a3a-2127-422b-91ae-364da2661108"}]}}