CVE-2023-28119: The crewjam/saml go library contains a partial implementation of the SAML standard in golang

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HIGH 7.5REMOTEDOWNGRADE

CVE-2023-28119 is a high-severity flaw (CVSS 7.5) affecting saml. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The crewjam/saml go library contains a partial implementation of the SAML standard in golang. Prior to version 0.4.13, the package's use of `flate.NewReader` does not limit the size of the input. The user can pass more than 1 MB of data in the HTTP request to the processing functions, which will be decompressed server-side using the Deflate algorithm. Therefore, after repeating the same request multiple times, it is possible to achieve a reliable

Why this priority

High severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 39%)
CISA exploited list	No
Weakness	CWE-770
Published	2023-03-22
Last modified	2026-06-17

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

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

Am I affected?

Timeline

2023-03-22 20:15 UTCPublished CVE record published
2026-06-17 05:46 UTCUpdated Record last modified

saml project saml DOWNGRADE

Affected: 0.4.12

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.4.12

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.4.12 (Debian / Ubuntu)

apt-cache madison saml sudo apt install saml=<VERSION_BEFORE_0.4.12> sudo apt-mark hold saml

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list saml sudo dnf downgrade saml-<VERSION_BEFORE_0.4.12> sudo dnf versionlock add saml

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.

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-2023-28119?

saml: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-28119 being exploited?

CVE-2023-28119 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-2023-28119 affect?

CVE-2023-28119 affects saml. Severity is high (CVSS 7.5). The crewjam/saml go library contains a partial implementation of the SAML standard in golang. Prior to version 0.4.13, the package's use of `flate.NewReader` does not limit the size of the input. The user can pass more than 1 MB of data in

How urgent is CVE-2023-28119?

Priority 47/100. High severity; Remotely exploitable, no login, no user action

Software pages

Go (Golang) vulnerabilities

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References

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