CVE-2007-2536: PicoZip allows remote attackers to cause a denial of service (infinite loop) via a ZOO archive with a direntry

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HIGH 7.8DOWNGRADE

CVE-2007-2536 is a high-severity flaw (CVSS 7.8) affecting picozip. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

PicoZip allows remote attackers to cause a denial of service (infinite loop) via a ZOO archive with a direntry structure that points to a previous file.

Why this priority

High severity
EPSS top 5%: very likely to be exploited
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.8 (High)
EPSS exploit chance	8.5% (top 5%)
CISA exploited list	No
Published	2007-05-09
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: picozip

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2007-05-09 01:19 UTCPublished CVE record published
2026-06-16 22:39 UTCUpdated Record last modified

picozip picozip DOWNGRADE

Affected: 4.01 · 4.02

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.01

1. Check installed version

apt-cache policy picozip || rpm -q picozip || picozip --version

2. No fixed release: DOWNGRADE to a release before 4.01 (Debian / Ubuntu)

apt-cache madison picozip sudo apt install picozip=<VERSION_BEFORE_4.01> sudo apt-mark hold picozip

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list picozip sudo dnf downgrade picozip-<VERSION_BEFORE_4.01> sudo dnf versionlock add picozip

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Zoo 2.10 - .ZOO Compression Algorithm Remote Denial of Service

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2007-2536?

picozip: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2007-2536 being exploited?

CVE-2007-2536 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2007-2536 affect?

CVE-2007-2536 affects picozip. Severity is high (CVSS 7.8). PicoZip allows remote attackers to cause a denial of service (infinite loop) via a ZOO archive with a direntry structure that points to a previous file.

How urgent is CVE-2007-2536?

Priority 56/100. High severity; EPSS top 5%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2007-2058 MEDIUM 6.8 DOWNGRADE Directory traversal vulnerability in Acubix PicoZip 4.02 allows user-assisted remote attackers to overwrite ar
CVE-2006-2909 HIGH 7.5 DOWNGRADE Stack-based buffer overflow in the info tip shell extension (zipinfo.dll) in PicoZip 4.01 allows remote attack

References

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