CVE-2026-5086

#!/usr/bin/perl use strict; use warnings; use Time::HiRes qw(time); # Simulate vulnerable comparison in Crypt::SecretBuffer < 0.019 sub vulnerable_compare { my ($secret, $input) = @_; # Vulnerability: Uses standard string comparison which returns early return $secret eq $input; } my $secret_buffer = "sensitive_secret_key_123"; my @test_inputs = ( "a", # Wrong first char "s", # Correct first char "se", # Correct first two chars "wrong_guess_xxxxxxxxx" # Completely wrong ); print "Measuring timing differences (microseconds):\n"; foreach my $input (@test_inputs) { my $start = time(); vulnerable_compare($secret_buffer, $input); my $elapsed = (time() - $start) * 1_000_000; printf "Input: %-25s Time: %.4f us\n", $input, $elapsed; } # Analysis: # If 's' takes longer than 'a', and 'se' takes longer than 's', # an attacker can confirm correct characters sequentially.

{"cve": {"id": "CVE-2026-5086", "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "published": "2026-04-13T23:16:27.990", "lastModified": "2026-05-06T17:16:49.683", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Crypt::SecretBuffer versions before 0.019 for Perl is suseceptible to timing attacks.\n\nFor example, if Crypt::SecretBuffer was used to store and compare plaintext passwords, then discrepencies in timing could be used to guess the secret password."}], "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:N/A:N", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-208"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:nerdvana:crypt\\:\\:secretbuffer:*:*:*:*:*:perl:*:*", "versionEndExcluding": "0.019", "matchCriteriaId": "93A2172E-D859-484C-BF39-687B58BCC991"}]}]}], "references": [{"url": "https://metacpan.org/release/NERDVANA/Crypt-SecretBuffer-0.019/source/Changes", "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "tags": ["Product", "Release Notes"]}, {"url": "http://www.openwall.com/lists/oss-security/2026/04/13/12", "source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory", "Mailing List"]}]}}