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CVE-2026-48962: IO::Compress versions before 2.220 for Perl can execute arbitrary code in File::GlobMapper via an attacker-controlled output glob

IO::Compress versions before 2.220 for Perl can execute arbitrary code in File::GlobMapper via an attacker-controlled output glob. _parseOutputGlob() wraps the caller-supplied output glob string in double quotes and stores it in the parser state; _getFiles() then runs the stored expression through eval STRING. A literal double quote in the output glob closes the dquote wrapper, and the characters that follow are evaluated as Perl. Arbitrary Perl in the output glob executes at the calling process's privilege.

HighCVSS 7.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A flaw in Perl's IO::Compress before version 2.220 can let malicious output-glob input run code with the affected process's privileges. Impact may include data theft, modification, or service disruption. Risk depends on whether an application passes attacker-controlled output globs into File::GlobMapper.

Executive priority

Prioritize prompt remediation where untrusted users can influence file-mapping or archive workflows, especially privileged services. Systems merely containing the package without a reachable attacker-controlled output-glob path have lower immediate exposure, but should remain in the upgrade program. No active exploitation is established by the supplied evidence.

Technical view

File::GlobMapper stores a caller-supplied output glob inside double quotes, then evaluates it using Perl eval STRING. An embedded double quote can escape that wrapper, causing subsequent input to be interpreted as Perl code. The issue is classified as CWE-94/CWE-95 and scored CVSS 3.1 7.8.

Likely exposure

Exposure requires IO::Compress earlier than 2.220 and a reachable workflow that supplies attacker-controlled output-glob content to File::GlobMapper. The CVSS vector describes local access with low privileges, no user interaction, and potential high confidentiality, integrity, and availability impact. The supplied package metadata is insufficient for identifying every affected distribution package.

Exploitation context

The source bundle does not report known active exploitation, and the CVE is not marked as present in KEV. Exploitation still requires control over the relevant output-glob input. Successful abuse executes Perl within the calling process's security context; network reachability depends on how an application exposes that input.

Researcher notes

The vulnerable pattern combines quote-based expression construction with eval STRING. Review should focus on data flow into the output-glob parameter and the effective privileges of the caller. The upstream patch and 2.220 release notes are the strongest supplied remediation references. Do not infer remote exposure without application-specific evidence.

Mitigation direction

  • Upgrade IO::Compress to version 2.220 or later.
  • Apply applicable Red Hat security updates on vendor-managed systems.
  • Prevent untrusted input from controlling File::GlobMapper output globs.
  • Check vendor guidance before applying distribution-specific package changes.

Validation and detection

  • Inventory installed and bundled IO::Compress versions, including application-local Perl dependencies.
  • Identify every File::GlobMapper call and trace the source of its output-glob argument.
  • Confirm production workloads resolve to IO::Compress 2.220 or a vendor-patched package.
  • Test that untrusted users cannot influence output-glob values after remediation.
Prepared
Confidence
high
Sources
7

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · medium confidence lookup

CWE-94: Code execution behavior lookup

Code execution and unsafe deserialization weaknesses often justify reviewing execution behavior and process telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cwe · medium confidence lookup

CWE-95: Code execution behavior lookup

Code execution and unsafe deserialization weaknesses often justify reviewing execution behavior and process telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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cve · low confidence lookup

CVE-2026-48962 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.8 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
7Timeline events
3ADP providers
19Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: yesTechnical Impact: partial

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.8CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9redhat-SADP
7.3CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L3.93.4CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

7.8High
CVSS 3.1 vector shape for CVE-2026-48962Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. Source timelineCPANSec

    Issue reported.

  2. Source timelineCPANSec

    Version 2.220 released.

  3. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  4. ADP timelineredhat-SADP

    Made public.

  5. CVE publishedCVE Program

    The CVE record was published.

  6. ADP timelineredhat-SADP

    Reported to Red Hat.

  7. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CVECVE Program Container
CISA-ADPCISA ADP Vulnrichment
cvssV3_1other:ssvc
redhat-SADPperl-IO-Compress: perl-IO-Compress: Arbitrary code execution via attacker-controlled output glob
other:Red Hat severity ratingcvssV3_1
  • 2026-05-27T04:01:00.966Z: Reported to Red Hat.
  • 2026-05-27T03:12:38.974Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
PMQSIO::CompressIO-Compress, 0unaffected
Weakness

CWE details

CWE-94CWE-95

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.