CVE-2026-8700

Description

Crypt::DSA versions before 1.20 for Perl generate seeds using rand. Seeds were generated using Perl's built-in rand function, which is predictable and unsuitable for security usage.

CVSS Details

CVSS Score

7.3

Severity

HIGH

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Crypt::DSA < 1.20

PoC / Exploit Code

⚠ For Security Research Only

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

python

#!/usr/bin/perl
# This PoC demonstrates the vulnerable logic in Crypt::DSA < 1.20
# It simulates the weak seed generation using Perl's built-in rand()

use strict;
use warnings;

sub vulnerable_seed_generation {
    # Vulnerable code: Predictable seed generation
    my $seed = int(rand(2**32));
    return $seed;
}

print "[+] Simulating vulnerable seed generation in Crypt::DSA < 1.20\n";
my $seed1 = vulnerable_seed_generation();
my $seed2 = vulnerable_seed_generation();

print "Generated Seed 1: $seed1\n";
print "Generated Seed 2: $seed2\n";
print "[-] An attacker observing these values could potentially predict future seeds.\n";
print "[!] Fix: Upgrade to Crypt::DSA 1.20 or later which uses Crypt::Random.\n";

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-8700
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-8700
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-8700/
[4] VulDB https://vuldb.com/cve/CVE-2026-8700
[5] https://metacpan.org/release/TIMLEGGE/Crypt-DSA-1.20/changes
[6] https://metacpan.org/release/TIMLEGGE/Crypt-DSA-1.20/diff/TIMLEGGE/Crypt-DSA-1.19#lib/Crypt/DSA/KeyChain.pm
[7] http://www.openwall.com/lists/oss-security/2026/05/15/26

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-8700", "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "published": "2026-05-15T22:16:57.020", "lastModified": "2026-05-18T17:40:45.343", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Crypt::DSA versions before 1.20 for Perl generate seeds using rand.\n\nSeeds were generated using Perl's built-in rand function, which is predictable and unsuitable for security usage."}], "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:L/A:L", "baseScore": 7.3, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "LOW"}, "exploitabilityScore": 3.9, "impactScore": 3.4}]}, "weaknesses": [{"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-331"}]}], "references": [{"url": "https://metacpan.org/release/TIMLEGGE/Crypt-DSA-1.20/changes", "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"}, {"url": "https://metacpan.org/release/TIMLEGGE/Crypt-DSA-1.20/diff/TIMLEGGE/Crypt-DSA-1.19#lib/Crypt/DSA/KeyChain.pm", "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"}, {"url": "http://www.openwall.com/lists/oss-security/2026/05/15/26", "source": "af854a3a-2127-422b-91ae-364da2661108"}]}}