CVE-2021-32825: bblfshd is an open source self-hosted server for source code parsing

Q: How do I fix CVE-2021-32825?

bblfshd: upgrade to 2021-08-11. Exact commands for each OS are on this page.

Q: Is CVE-2021-32825 being exploited?

CVE-2021-32825 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-2021-32825 affect?

CVE-2021-32825 affects bblfshd. Severity is low (CVSS 2.7). bblfshd is an open source self-hosted server for source code parsing. In bblfshd before commit 4265465b9b6fb5663c30ee43806126012066aad4 there is a "zipslip" vulnerability. The unsafe handling of symbolic links in an unpacking routine may en

Q: How urgent is CVE-2021-32825?

Priority 29/100. Public exploit reference

Routine

LOW 2.7UPGRADE

CVE-2021-32825 is a low-severity flaw (CVSS 2.7) affecting bblfshd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

bblfshd is an open source self-hosted server for source code parsing. In bblfshd before commit 4265465b9b6fb5663c30ee43806126012066aad4 there is a "zipslip" vulnerability. The unsafe handling of symbolic links in an unpacking routine may enable attackers to read and/or write to arbitrary locations outside the designated target folder. This issue may lead to arbitrary file write (with same permissions as the program running the unpack operation) i

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	2.7 (Low)
Attack vector	Local
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.9% (top 40%)
CISA exploited list	No
Weakness	CWE-23, CWE-59
Published	2021-08-16
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: bblfshd project

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

Am I affected?

Timeline

2021-08-16 19:15 UTCPublished CVE record published
2026-06-17 03:53 UTCUpdated Record last modified

bblfshd project bblfshd UPGRADE

Affected: < 2021-08-11

Fixed in: 2021-08-11

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 2021-08-11 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade bblfshd

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-2021-32825?

bblfshd: upgrade to 2021-08-11. Exact commands for each OS are on this page.

Is CVE-2021-32825 being exploited?

CVE-2021-32825 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-2021-32825 affect?

CVE-2021-32825 affects bblfshd. Severity is low (CVSS 2.7). bblfshd is an open source self-hosted server for source code parsing. In bblfshd before commit 4265465b9b6fb5663c30ee43806126012066aad4 there is a "zipslip" vulnerability. The unsafe handling of symbolic links in an unpacking routine may en

How urgent is CVE-2021-32825?

Priority 29/100. Public exploit reference

References

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