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Crypt CVE-2026-2474

HIGH
Heap-based Buffer Overflow (CWE-122)
2026-02-16 9b29abf9-4ab0-4765-b253-1875cd9b441e
7.5
CVSS 3.1 · NVD
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Invoke Perl script with Crypt::URandom
  2. Delivery
    Call crypt_urandom_getrandom() with negative length parameter
  3. Exploit
    Integer wraparound causes zero-byte allocation
  4. Execution
    getrandom() writes to unallocated heap
  5. Impact
    Heap corruption and denial of service

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A06:2021 - Vulnerable and Outdated Components
ASVS 5.0
V15 - Secure Coding and Architecture Heap buffer bounds checking
MITRE ATT&CK

1 technique across 1 tactic: Execution

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Exploitation Conditions

Crypt::URandom versions 0.41 through 0.54 installed. Attacker can supply negative values to crypt_urandom_getrandom() function, typically through Perl code calling the vulnerable XS function directly or indirectly via application logic accepting user-controlled length parameters.

Impact

CVSS 7.5 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: None. User interaction: None.

Exploit ScenarioDerived

An attacker could exploit this vulnerability to writes beyond the allocated buffer, leading to heap memory corruption and applic.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Heap buffer overflow in Perl's Crypt::URandom module (versions 0.41-0.54) allows denial of service through integer wraparound when negative length values are passed to the crypt_urandom_getrandom() XS function, causing heap corruption and application crashes. The vulnerability requires direct control over the length parameter, limiting real-world exploitability in typical usage scenarios where this value is hardcoded. No patch is currently available for affected users.

Earlier versions of this analysis (1)
v1 Mar 12, 2026 - 21:54 CVSS 7.5

Crypt::URandom versions from 0.41 before 0.55 for Perl is vulnerable to a heap buffer overflow in the XS function crypt_urandom_getrandom(). The function does not validate that the length parameter is non-negative. [CVSS 7.5 HIGH]

RemediationAI

Monitor vendor advisories for a patch. Enable ASLR, DEP/NX, and stack canaries where possible. Restrict network access to the affected service where possible.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Classified as CWE-122 (Heap-based Buffer Overflow). Affects the the XS component of Crypt\. Crypt::URandom versions from 0.41 before 0.55 for Perl is vulnerable to a heap buffer overflow in the XS function crypt_urandom_getrandom().

The function does not validate that the length parameter is non-negative. If a negative value (e.g. -1) is supplied, the expression length + 1u causes an integer wraparound, resulting in a zero-byte allocation. The subsequent call to getrandom(data, length, GRND_NONBLOCK) passes the original negative value, which is implicitly converted to a large unsigned

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Severity by source

NVD PRIMARY 7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SUSE HIGH

Primary rating from NVD.

CVSS VectorNVD

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

Lifecycle Timeline

2
Patch released
Apr 09, 2026 - 20:30 nvd
Patch available
CVE Published
Feb 16, 2026 - 21:22 nvd
HIGH 7.5

DescriptionCVE.org

Crypt::URandom versions from 0.41 before 0.55 for Perl is vulnerable to a heap buffer overflow in the XS function crypt_urandom_getrandom().

The function does not validate that the length parameter is non-negative. If a negative value (e.g. -1) is supplied, the expression length + 1u causes an integer wraparound, resulting in a zero-byte allocation. The subsequent call to getrandom(data, length, GRND_NONBLOCK) passes the original negative value, which is implicitly converted to a large unsigned value (typically SIZE_MAX). This can result in writes beyond the allocated buffer, leading to heap memory corruption and application crash (denial of service).

In common usage, the length argument is typically hardcoded by the caller, which reduces the likelihood of attacker-controlled exploitation. Applications that pass untrusted input to this parameter may be affected.

Executive ViewAI

Why It Matters

Crypt::URandom library versions 0.41-0.54 contain a critical heap buffer overflow vulnerability that could allow attackers to execute arbitrary code or crash systems using this Perl cryptography module. Organizations running affected versions face immediate risk of system compromise, particularly in applications handling sensitive cryptographic operations.

Business Impact: High
Compensating Controls

Disable Crypt::URandom module usage if operationally feasible; restrict network access to applications using this library to trusted networks only; implement strict input validation on any parameters passed to cryptographic functions; monitor for exploitation attempts via heap corruption signatures in application logs and system memory dumps; consider using alternative, patched Perl cryptographic libraries (e.g., Crypt::Random) pending vendor patch release.

Threat Intelligence Overview

EPSS Score
0.0%
Top 85% exploitable
Data Quality
3 sources
Confidence: Low

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 0.0%
Patch available Yes
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact
High

Priority Score

38
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +38
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

Memory corruption occurs when a program writes data beyond the boundaries of allocated memory regions or accesses memory in unintended ways, violating the integrity of the process's address space.

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Affected Products (CPE)CVE.org

cpe:2.3:a:ddick:crypt\:\:urandom:*:*:*:*:*:perl:*:*

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Vendor StatusVendor

SUSE

Severity: High
Product Status
SUSE Linux Enterprise Server 12 SP5-LTSS Fixed
SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 Fixed
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed

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