CVE-2026-32288: tar.Reader can allocate an unbounded amount of memory when reading a maliciously-crafted archive containing a

Routine

MEDIUM 5.5UPGRADE

CVE-2026-32288 is a medium-severity flaw (CVSS 5.5) affecting go. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

tar.Reader can allocate an unbounded amount of memory when reading a maliciously-crafted archive containing a large number of sparse regions encoded in the "old GNU sparse map" format.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 79%)
CISA exploited list	No
Weakness	CWE-770
Published	2026-04-08
Last modified	2026-07-25

Publisher (CNA): Go Project · Vendor: golang

Last updated 2026-07-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-08 02:16 UTCPublished CVE record published
2026-07-25 10:10 UTCUpdated Record last modified

golang go UPGRADE

Affected: < 1.25.9 · >= 1.26.0 and < 1.26.2

Fixed in: 1.25.9, 1.26.2

Safe to downgrade to: a release before 1.26.0

1. Check installed version

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

2. UPGRADE to 1.25.9 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade go

Note

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

3. If no update is available yet, DOWNGRADE to a release before 1.26.0 (Debian / Ubuntu)

apt-cache madison go sudo apt install go=<VERSION_BEFORE_1.26.0> sudo apt-mark hold go

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list go sudo dnf downgrade go-<VERSION_BEFORE_1.26.0> sudo dnf versionlock add go

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.

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-2026-32288?

go: upgrade to 1.25.9, 1.26.2. Exact commands for each OS are on this page.

Is CVE-2026-32288 being exploited?

CVE-2026-32288 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-2026-32288 affect?

CVE-2026-32288 affects go. Severity is medium (CVSS 5.5). tar.Reader can allocate an unbounded amount of memory when reading a maliciously-crafted archive containing a large number of sparse regions encoded in the "old GNU sparse map" format.

How urgent is CVE-2026-32288?

Priority 25/100. No elevated risk signals yet.

Software pages

Go (Golang) vulnerabilities

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References

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