TI-2026-36217 Aliases CVE-2026-48959 GHSA-7vxx-5gqr-7r44

IO::Uncompress::Unzip versions before 2.220 for Perl allow CPU exhaustion via per-byte…

MEDIUM 40CWE-407Published 2026-05-27 · Updated 2026-05-29

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Partial Red Hat: 4 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-407.

Summary

IO::Uncompress::Unzip versions before 2.220 for Perl allow CPU exhaustion via per-byte read loop in fastForward. fastForward() compares length $offset (the digit count of the offset, 1 to 19) against the chunk size $c instead of $offset itself, so $c shrinks from 16 KiB to 1-19 bytes per iteration. Extracting a named entry from an attacker supplied zip via IO::Uncompress::Unzip->new($zip, Name => $target) drives a per-byte read loop scaling with the entry's compressed size, up to the non-Zip64 4 GiB cap.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00553 46th percentileScored 2026-11-07

Fix Partial IO::Uncompress::Unzip (PMQS): 2.220Red Hat: 4 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
PMQS	IO::Uncompress::Unzip	before 2.220	2.220	Patch available	CNA

IO::Uncompress::Unzip VendorPMQS Affected before 2.220 Fixed in 2.220 Patch available CNA

Remediation

Fix · CNA IO::Uncompress::Unzip (PMQS) Fixed in 2.220

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Enterprise Linux 10	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 7	Affected	No fix planned: Out of support scope
Red Hat Enterprise Linux 8	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 9	Affected	No fix yet: Fix deferred

Timeline

2026-10-02 Threatist record created from CVE-2026-48959
2026-10-03 Alias added: GHSA-7vxx-5gqr-7r44

References

Patch 1

https://github.com/pmqs/IO-Compress/commit/68db44076f4c1a86a2ffe53a958eac6cabaf72e2.patch

Other 1

https://metacpan.org/release/PMQS/IO-Compress-2.220/changes

TI-2026-02917 Compress::Raw::Zlib versions through 2.219 for Perl use potentially insecure versions of… CVSS 3.1CRITICAL 9.8
TI-2026-36219 IO::Compress versions before 2.220 for Perl can execute arbitrary code in… CVSS 3.1HIGH 7.3
TI-2026-36218 Improper handling of exceptional conditions in PMQS IO::Compress CVSS 3.1HIGH 7.3
TI-2025-14272 IO::Uncompress::Unzip versions before 2.215 for Perl propagate uncaught exception when… CVSS 3.1MEDIUM 5.5

Sources

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