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Compress CVE-2026-3381

CRITICAL
Improper Validation of Specified Quantity in Input (CWE-1284)
2026-03-05 9b29abf9-4ab0-4765-b253-1875cd9b441e
Information Disclosure Red Hat Suse Compress Pmqs
Critical
Disputed · 9.8 NVD
View

Attack ChainAIDerived

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

  1. Access
    Identify vulnerable Compress::Raw::Zlib version
  2. Exploit
    Craft malicious zlib-compressed data
  3. Execution
    Trigger memory corruption in decompression
  4. Impact
    Execute arbitrary code with application privileges

Vulnerability Assessment

Weakness
CWE
CWE-1284
OWASP Top 10:2025
A06:2021 - Vulnerable and Outdated Components
ASVS 5.0
V2 - Validation and Business Logic Input size validation
Exploitation Conditions

Compress::Raw::Zlib versions 2.219 and earlier must be installed and actively used to decompress untrusted data. Application must process attacker-controlled compressed input through vulnerable zlib library bundled in Compress::Raw::Zlib.
Impact

CVSS 9.8.
Exploit ScenarioDerived

Exploit known zlib vulnerabilities.
Act Now Prioritize within 24-48h. Why: CRITICAL severity.
Patch available 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Insecure embedded zlib in Compress::Raw::Zlib through 2.219 for Perl.

Earlier versions of this analysis (1)
v1 Mar 12, 2026 - 22:06 CVSS 9.8

Vulnerable embedded zlib.

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Technical ContextAI · show details

CWE-1284 outdated zlib.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

Sources disagree (Medium–Critical)
NVD PRIMARY 9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
ENISA EUVD HIGH
SUSE CRITICAL
Red Hat 5.3 MEDIUM

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorNVD

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

DescriptionCVE.org

Compress::Raw::Zlib versions through 2.219 for Perl use potentially insecure versions of zlib.

Compress::Raw::Zlib includes a copy of the zlib library. Compress::Raw::Zlib version 2.220 includes zlib 1.3.2, which addresses findings fron the 7ASecurity audit of zlib. The includes fixs for CVE-2026-27171.

Executive ViewAI

Why It Matters

CVE-2026-3381 is a critical vulnerability affecting Perl's Compress::Raw::Zlib library that could allow attackers to compromise systems using affected versions. Organizations using Perl applications with this library face potential data breach, system compromise, and service disruption risks. Immediate inventory and mitigation actions are required as no vendor patch is currently available.

Business Impact: Severe
Compensating Controls

Disable compression features in affected Perl applications if operationally feasible; implement network segmentation to restrict access to services using Compress::Raw::Zlib; deploy WAF rules to detect and block exploitation attempts targeting compression-related endpoints; enforce strict input validation on compressed data; restrict untrusted user input to affected modules; monitor for suspicious zlib-related process execution; consider replacing with alternative compression libraries (e.g., IO::Compress) if compatible with your Perl applications.

Threat Intelligence Overview

EPSS Score
0.1%
Top 78% exploitable
Threat Intel
1
1 source
Data Quality
7 sources
Confidence: High
NVD CVE.org EPSS NCSC-NL Vendor GitHub VulDB

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 CRITICAL
CISA KEV No
Public POC No
EPSS 0.1%
Patch available Yes
Active threat No
Deciding rule
CRITICAL severity
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
Out-of-Cycle
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact
Very High

Priority Score

54
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +49
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: +5

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Affected Products (CPE)CVE.org

cpe:2.3:a:pmqs:compress\:\:raw\:\:zlib:*:*:*:*:*:perl:*:*

Related Vulnerabilities in Perl Library Security Issues

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CVE-2026-3257 CRITICAL
9.8

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CVE-2026-116591 HIGH
8.7 Oct 26

Untrusted zstd input can crash any Go application that decompresses it with klauspost/compress 1.20.1 or earlier: a craf

Same weakness CWE-1284 – Improper Validation of Specified Quantity in Input

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CVE-2021-43267 CRITICAL POC
9.8
CVE-2025-65548 CRITICAL POC
9.1
CVE-2023-54337 CRITICAL POC
9.1
CVE-2025-5349 HIGH POC
8.8
CVE-2026-82750 HIGH POC
8.3

Same technique Information Disclosure

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CVE-2019-2725 CRITICAL POC
9.8
CVE-2021-34523 CRITICAL POC
9.0
CVE-2013-2251 CRITICAL POC
9.8
CVE-2017-5638 CRITICAL POC
9.8
CVE-2025-24813 CRITICAL POC
9.8
CVE-2025-68613 HIGH POC
8.8
CVE-2015-1701 HIGH POC
7.8
CVE-2017-0147 HIGH POC
7.5

Vendor StatusVendor

SUSE

Severity: Critical
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Micro 5.2 Fixed
SUSE Linux Enterprise Micro 5.3 Fixed

References

Advisories & patches
ADVISORY https://vuldb.com/vuln/348887 REF https://7asecurity.com/blog/2026/02/zlib-7asecurity-audit/ REF https://github.com/madler/zlib REF https://github.com/madler/zlib/releases/tag/v1.3.2 REF https://github.com/pmqs/Compress-Raw-Zlib/issues/41 REF https://metacpan.org/release/PMQS/Compress-Raw-Zlib-2.221/source/Changes REF https://www.cve.org/CVERecord?id=CVE-2026-27171 REF https://www.zlib.net/

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