CVE-2026-9312: A server-side request forgery (SSRF) vulnerability was identified in GitHub Enterprise Server that allowed an

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HIGH 8.2REMOTEUPGRADE

CVE-2026-9312 is a high-severity flaw (CVSS 8.2) affecting enterprise server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A server-side request forgery (SSRF) vulnerability was identified in GitHub Enterprise Server that allowed an unauthenticated attacker to send crafted requests to internal services by exploiting insufficient input validation in an upload endpoint. By injecting path traversal content into request parameters, an attacker could bypass the intended request flow and redirect internal API calls, potentially accessing internal services and exposing sens

Why this priority

High severity
EPSS top 5%: very likely to be exploited
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	9.2% (top 5%)
CISA exploited list	No
Weakness	CWE-918
Published	2026-05-27
Last modified	2026-07-23

Publisher (CNA): GitHub, Inc. (Products Only) · Vendor: github

Last updated 2026-07-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-27 00:16 UTCPublished CVE record published
2026-07-23 11:10 UTCUpdated Record last modified

github enterprise server UPGRADE

Affected: >= 3.16.0 and < 3.16.19 · >= 3.17.0 and < 3.17.16 · >= 3.18.0 and < 3.18.10 · >= 3.19.0 and < 3.19.7 · >= 3.20.0 and < 3.20.3 · 3.21.1 rc1

Fixed in: 3.16.19, 3.17.16, 3.18.10, 3.19.7, 3.20.3

Safe to downgrade to: a release before 3.16.0

1. Check installed version

apt-cache policy enterprise-server || rpm -q enterprise-server || enterprise-server --version

2. UPGRADE to 3.16.19 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade enterprise-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade enterprise-server

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 3.16.0 (Debian / Ubuntu)

apt-cache madison enterprise-server sudo apt install enterprise-server=<VERSION_BEFORE_3.16.0> sudo apt-mark hold enterprise-server

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

dnf --showduplicates list enterprise-server sudo dnf downgrade enterprise-server-<VERSION_BEFORE_3.16.0> sudo dnf versionlock add enterprise-server

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.

Exact fixes by distribution

Fedora ELN · clash-meta · FIXED · 1.19.33-1.eln159 · FEDORA-2026-7dfb64c5e1 · source

sudo dnf upgrade --advisory=FEDORA-2026-7dfb64c5e1

Fedora 46 · vulkan-utility-libraries · FIXED · 1.4.363.0-1.fc46 · FEDORA-2026-994176daf5 · source

sudo dnf upgrade --advisory=FEDORA-2026-994176daf5

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-2026-9312?

enterprise server: upgrade to 3.16.19, 3.17.16, 3.18.10, 3.19.7, 3.20.3. Exact commands for each OS are on this page.

Is CVE-2026-9312 being exploited?

CVE-2026-9312 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-2026-9312 affect?

CVE-2026-9312 affects enterprise server. Severity is high (CVSS 8.2). A server-side request forgery (SSRF) vulnerability was identified in GitHub Enterprise Server that allowed an unauthenticated attacker to send crafted requests to internal services by exploiting insufficient input validation in an upload en

How urgent is CVE-2026-9312?

Priority 58/100. High severity; EPSS top 5%: very likely to be exploited; Remotely exploitable, no login, no user action

Software pages

GitHub vulnerabilities

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References

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