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Vulnerabilities

Vulnerability · CVE-2026-48959

IO::Uncompress::Unzip versions before 2.220 for Perl allow CPU exhaustion via per-byte read loop in fastForward.

Published May 27, 2026 · catalog updated Nov 3, 2026 · IO::Uncompress::Unzip versions before 2.220

Last checked Nov 4, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-48959. EPSS is 0.55%. Act only if a listed version of IO::Uncompress::Unzip versions before 2.220 is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (IO::Uncompress::Unzip versions before 2.220).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.55%
Remediation
Advisory link
Affected products
Alpine:v3.24 perl

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Alpine:v3.24 perl0 → 5.42.3-r0

How to fix CVE-2026-48959

  • Upgrade

    CVE-2026-48959 lists a fix boundary at 5.42.3-r0. Compare the installed build with that boundary before you change production.

  • Version check

    Fixed in 5.42.3-r0

  • Advisory

    Open the cve_org record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-48959. EPSS is 0.55%. Act only if a listed version of IO::Uncompress::Unzip versions before 2.220 is installed.

Which versions are affected?

Compare what you have installed with 0 → 5.42.3-r0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.55%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. May 27, 2026 · Trivy Vulnerability DB

    Detected

    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 =>

  2. Nov 3, 2026 · Trivy Vulnerability DB

    Fix available

    perl fixed in 5.42.3-r0

  3. Nov 3, 2026 · Trivy Vulnerability DB

    Fix available

    perl fixed in 5.42.3-r0

  4. Nov 3, 2026 · Trivy Vulnerability DB

    Updated

    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 =>

Sources

  • CVE.orgVulnerability recordCVE-2026-48959

    Official CVE identifier

    cve.org
  • Trivy Vulnerability DBPackage advisoryALPINE-CVE-2026-48959

    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 b

    osv.dev

References

Freshness

Last verified in this catalog Nov 3, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • Trivy Vulnerability DBNov 4, 2026
  • CVE.orgNov 4, 2026