CVE-2016-1901: Integer overflow in the authenticate_post function in CGit before 0.12 allows remote attackers to have unspeci

Q: How do I fix CVE-2016-1901?

fedora: mitigate or apply the listed mitigation; cgit: upgrade to newer than 0.11.2. Exact commands for each OS are on this page.

Q: Is CVE-2016-1901 being exploited?

CVE-2016-1901 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-2016-1901 affect?

CVE-2016-1901 affects fedora, cgit. Severity is critical (CVSS 9.8). Integer overflow in the authenticate_post function in CGit before 0.12 allows remote attackers to have unspecified impact via a large value in the Content-Length HTTP header, which triggers a buffer overflow.

Q: How urgent is CVE-2016-1901?

Priority 67/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEMITIGATEUPGRADE

CVE-2016-1901 is a critical-severity flaw (CVSS 9.8) affecting fedora, cgit. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Integer overflow in the authenticate_post function in CGit before 0.12 allows remote attackers to have unspecified impact via a large value in the Content-Length HTTP header, which triggers a buffer overflow.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	3.8% (top 10%)
CISA exploited list	No
Weakness	CWE-119
Published	2016-01-20
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: cgit project · fedoraproject

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

Am I affected?

Timeline

2016-01-20 16:59 UTCPublished CVE record published
2026-06-17 00:42 UTCUpdated Record last modified

fedoraproject fedora MITIGATE

Affected: 22

Fixed in: no fixed release known

Safe to downgrade to: a release before 22

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.

cgit project cgit UPGRADE

Affected: <= 0.11.2

Fixed in: newer than 0.11.2

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 0.11.2 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cgit

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-2016-1901?

fedora: mitigate or apply the listed mitigation; cgit: upgrade to newer than 0.11.2. Exact commands for each OS are on this page.

Is CVE-2016-1901 being exploited?

CVE-2016-1901 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-2016-1901 affect?

CVE-2016-1901 affects fedora, cgit. Severity is critical (CVSS 9.8). Integer overflow in the authenticate_post function in CGit before 0.12 allows remote attackers to have unspecified impact via a large value in the Content-Length HTTP header, which triggers a buffer overflow.

How urgent is CVE-2016-1901?

Priority 67/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

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References

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