CVE-2015-0838: Buffer overflow in the C implementation of the apply_delta function in _pack.c in Dulwich before 0.9.9 allows

Q: How do I fix CVE-2015-0838?

debian linux: mitigate or apply the listed mitigation; dulwich: upgrade to newer than 0.9.8. Exact commands for each OS are on this page.

Q: Is CVE-2015-0838 being exploited?

CVE-2015-0838 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-2015-0838 affect?

CVE-2015-0838 affects debian linux, dulwich. Severity is high (CVSS 7.5). Buffer overflow in the C implementation of the apply_delta function in _pack.c in Dulwich before 0.9.9 allows remote attackers to execute arbitrary code via a crafted pack file.

Q: How urgent is CVE-2015-0838?

Priority 53/100. High severity; On your watchlist

This month

HIGH 7.5WATCHLISTMITIGATEUPGRADE

CVE-2015-0838 is a high-severity flaw (CVSS 7.5) affecting debian linux, dulwich. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in the C implementation of the apply_delta function in _pack.c in Dulwich before 0.9.9 allows remote attackers to execute arbitrary code via a crafted pack file.

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	3.4% (top 11%)
CISA exploited list	No
Weakness	CWE-119
Published	2015-03-31
Last modified	2026-06-17

Publisher (CNA): Debian GNU/Linux · Vendor: debian · dulwich project

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

Am I affected?

Timeline

2015-03-31 14:59 UTCPublished CVE record published
2026-06-17 00:21 UTCUpdated Record last modified

debian debian linux MITIGATE

Affected: 7.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

dulwich project dulwich UPGRADE

Affected: <= 0.9.8

Fixed in: newer than 0.9.8

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 0.9.8 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade dulwich

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-2015-0838?

debian linux: mitigate or apply the listed mitigation; dulwich: upgrade to newer than 0.9.8. Exact commands for each OS are on this page.

Is CVE-2015-0838 being exploited?

CVE-2015-0838 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-2015-0838 affect?

CVE-2015-0838 affects debian linux, dulwich. Severity is high (CVSS 7.5). Buffer overflow in the C implementation of the apply_delta function in _pack.c in Dulwich before 0.9.9 allows remote attackers to execute arbitrary code via a crafted pack file.

How urgent is CVE-2015-0838?

Priority 53/100. High severity; On your watchlist

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References

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