CVE-2015-4646: (1) unsquash-1.c, (2) unsquash-2.c, (3) unsquash-3.c, and (4) unsquash-4.c in Squashfs and sasquatch allow rem

Q: How do I fix CVE-2015-4646?

squashfs: upgrade to newer than 4.3. Exact commands for each OS are on this page.

Q: Is CVE-2015-4646 being exploited?

CVE-2015-4646 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2015-4646 affect?

CVE-2015-4646 affects squashfs. Severity is high (CVSS 7.5). (1) unsquash-1.c, (2) unsquash-2.c, (3) unsquash-3.c, and (4) unsquash-4.c in Squashfs and sasquatch allow remote attackers to cause a denial of service (application crash) via a crafted input.

Q: How urgent is CVE-2015-4646?

Priority 55/100. High severity; EPSS top 6%: very likely to be exploited; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2015-4646 is a high-severity flaw (CVSS 7.5) affecting squashfs. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

(1) unsquash-1.c, (2) unsquash-2.c, (3) unsquash-3.c, and (4) unsquash-4.c in Squashfs and sasquatch allow remote attackers to cause a denial of service (application crash) via a crafted input.

Why this priority

High severity
EPSS top 6%: very likely to be exploited
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	6.9% (top 6%)
CISA exploited list	No
Weakness	CWE-20
Published	2017-04-13
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: squashfs project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2017-04-13 17:59 UTCPublished CVE record published
2026-06-17 00:27 UTCUpdated Record last modified

squashfs project squashfs UPGRADE

Affected: <= 4.3

Fixed in: newer than 4.3

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 4.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade squashfs

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade squashfs

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2015-4646?

squashfs: upgrade to newer than 4.3. Exact commands for each OS are on this page.

Is CVE-2015-4646 being exploited?

CVE-2015-4646 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-2015-4646 affect?

CVE-2015-4646 affects squashfs. Severity is high (CVSS 7.5). (1) unsquash-1.c, (2) unsquash-2.c, (3) unsquash-3.c, and (4) unsquash-4.c in Squashfs and sasquatch allow remote attackers to cause a denial of service (application crash) via a crafted input.

How urgent is CVE-2015-4646?

Priority 55/100. High severity; EPSS top 6%: very likely to be exploited; Remotely exploitable, no login, no user action

Related CVEs

CVE-2015-4645 MEDIUM 5.5 UPGRADE MITIGATE Integer overflow in the read_fragment_table_4 function in unsquash-4.c in Squashfs and sasquatch allows remote
CVE-2012-4025 MEDIUM 6.8 UPGRADE Integer overflow in the queue_init function in unsquashfs.c in unsquashfs in Squashfs 4.2 and earlier allows r
CVE-2012-4024 MEDIUM 6.8 UPGRADE Stack-based buffer overflow in the get_component function in unsquashfs.c in unsquashfs in Squashfs 4.2 and ea

References

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