CVE-2026-26058: Zulip is an open-source team collaboration tool

Routine

MEDIUM 6.1UPGRADE

CVE-2026-26058 is a medium-severity flaw (CVSS 6.1) affecting zulip. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Zulip is an open-source team collaboration tool. From version 1.4.0 to before version 11.6, ./manage.py import reads arbitrary files from the server filesystem via path traversal in uploads/records.json. A crafted export tarball causes the server to copy any file the zulip user can read into the uploads directory during import. This issue has been patched in version 11.6.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 85%)
CISA exploited list	No
Weakness	CWE-22
Published	2026-04-03
Last modified	2026-07-24

Publisher (CNA): GitHub, Inc. · Vendor: zulip

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-03 21:17 UTCPublished CVE record published
2026-07-24 22:10 UTCUpdated Record last modified

zulip zulip UPGRADE

Affected: >= 1.4.0 and <= 11.5

Fixed in: newer than 11.5

Safe to downgrade to: a release before 1.4.0

1. Check installed version

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

2. UPGRADE to newer than 11.5 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade zulip

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 1.4.0 (Debian / Ubuntu)

apt-cache madison zulip sudo apt install zulip=<VERSION_BEFORE_1.4.0> sudo apt-mark hold zulip

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

dnf --showduplicates list zulip sudo dnf downgrade zulip-<VERSION_BEFORE_1.4.0> sudo dnf versionlock add zulip

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-2026-26058?

zulip: upgrade to newer than 11.5. Exact commands for each OS are on this page.

Is CVE-2026-26058 being exploited?

CVE-2026-26058 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-2026-26058 affect?

CVE-2026-26058 affects zulip. Severity is medium (CVSS 6.1). Zulip is an open-source team collaboration tool. From version 1.4.0 to before version 11.6, ./manage.py import reads arbitrary files from the server filesystem via path traversal in uploads/records.json. A crafted export tarball causes the

How urgent is CVE-2026-26058?

Priority 30/100. Public exploit reference

Related CVEs

CVE-2026-25742 MEDIUM 5.3 UPGRADE Zulip is an open-source team collaboration tool

References

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