CVE-2026-48959Disclosure

LOWCVSS 7.5 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

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.

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0.0/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-407

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Threat summary

1 mentions across 1 observed day

What's happening

Technical details provided in 1 signal
Disclosure: 1 classified signal
1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Disclosure

1100.0%

Referenced assets2 URLs

By indicator

Full discourse1 post

Open Source Security mailing list@oss_security137d
Disclosure
CVE-2025-15649: IO::Uncompress::Unzip before 2.215 propagate uncaught exception when parsing zip header with malformed DOS date https://www.openwall.com/lists/oss-security/2026/05/27/1 CVE-2026-48959: IO::Uncompress::Unzip before 2.220 CPU exhaustion via per-byte read loop in fastForward https://www.openwall.com/lists/oss-security/2026/05/27/2
Post summary
The post announces two new CVEs for IO::Uncompress::Unzip, describing their technical impact (exception propagation and CPU exhaustion) but does not provide PoC, exploit details, or mitigation information.
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