Crypt::PBKDF2 versions before 0.261630 for Perl are vulnerable to timing attacks

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Summary

CVECVE-2017-20240
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-12 14:16:28 UTC
Updated2026-06-12 17:16:22 UTC
DescriptionCrypt::PBKDF2 versions before 0.261630 for Perl are vulnerable to timing attacks. These versions use Perl's built-in eq comparison. Discrepancies in timing could be used to guess the underlying derived-key.

Risk And Classification

Primary CVSS: v3.1 5.9 MEDIUM from ADP

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

EPSS: 0.003200000 probability, percentile 0.235140000 (date 2026-06-20)

Problem Types: CWE-208 | CWE-208 CWE-208 Observable Timing Discrepancy

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA ARODLAND CryptPBKDF2 affected 0.261630 custom Not specified

References

ReferenceSourceLinkTags
metacpan.org/release/ARODLAND/Crypt-PBKDF2-0.261630/changes 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
github.com/arodland/Crypt-PBKDF2/pull/6 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
metacpan.org/release/ARODLAND/Crypt-PBKDF2-0.161520/source/lib/Crypt/PBKDF... 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
www.openwall.com/lists/oss-security/2026/06/12/3 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
CNA2017-12-11T00:00:00.000ZIssue reported as pull request
CNA2026-06-11T00:00:00.000ZVersion 0.261630 released with a fix

Solutions

CNA: Upgrade to version 0.261630 or later.

Workarounds

CNA: Apply the patch from the referenced pull request.

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