CVE-2014-9765: Buffer overflow in the main_get_appheader function in xdelta3-main.h in xdelta3 before 3.0.9 allows remote att

Q: How do I fix CVE-2014-9765?

ubuntu linux: mitigate or apply the listed mitigation; debian linux: mitigate or apply the listed mitigation; xdelta3: upgrade to newer than 3.0.8. Exact commands for each OS are on this page.

Q: Is CVE-2014-9765 being exploited?

CVE-2014-9765 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-2014-9765 affect?

CVE-2014-9765 affects ubuntu linux, debian linux, xdelta3. Severity is high (CVSS 8.8). Buffer overflow in the main_get_appheader function in xdelta3-main.h in xdelta3 before 3.0.9 allows remote attackers to execute arbitrary code via a crafted input file.

Q: How urgent is CVE-2014-9765?

Priority 59/100. High severity; EPSS top 9%: very likely to be exploited; On your watchlist

This month

HIGH 8.8WATCHLISTMITIGATEMITIGATEUPGRADE

CVE-2014-9765 is a high-severity flaw (CVSS 8.8) affecting ubuntu linux, debian linux, xdelta3. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in the main_get_appheader function in xdelta3-main.h in xdelta3 before 3.0.9 allows remote attackers to execute arbitrary code via a crafted input file.

Why this priority

High severity
EPSS top 9%: very likely to be exploited
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	4.2% (top 9%)
CISA exploited list	No
Weakness	CWE-119
Published	2016-04-19
Last modified	2026-06-17

Publisher (CNA): Debian GNU/Linux · Vendor: canonical · debian · opensuse · xdelta

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

Am I affected?

Timeline

2016-04-19 21:59 UTCPublished CVE record published
2026-06-17 00:18 UTCUpdated Record last modified

canonical ubuntu linux MITIGATE

Affected: 14.04 · 15.10

Fixed in: no fixed release known

Safe to downgrade to: a release before 14.04

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.

debian debian linux MITIGATE

Affected: 7.0 · 8.0

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.

xdelta xdelta3 UPGRADE

Affected: <= 3.0.8

Fixed in: newer than 3.0.8

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy xdelta3 || rpm -q xdelta3 || xdelta3 --version

2. UPGRADE to newer than 3.0.8 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade xdelta3

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade xdelta3

Note

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

opensuse opensuse MITIGATE

Affected: 13.1 · 13.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 13.1

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.

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-2014-9765?

ubuntu linux: mitigate or apply the listed mitigation; debian linux: mitigate or apply the listed mitigation; xdelta3: upgrade to newer than 3.0.8. Exact commands for each OS are on this page.

Is CVE-2014-9765 being exploited?

CVE-2014-9765 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-2014-9765 affect?

CVE-2014-9765 affects ubuntu linux, debian linux, xdelta3. Severity is high (CVSS 8.8). Buffer overflow in the main_get_appheader function in xdelta3-main.h in xdelta3 before 3.0.9 allows remote attackers to execute arbitrary code via a crafted input file.

How urgent is CVE-2014-9765?

Priority 59/100. High severity; EPSS top 9%: very likely to be exploited; On your watchlist

Software pages

Ubuntu vulnerabilities · Debian vulnerabilities

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References

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