TI-2023-12698 Aliases CVE-2023-28119 GHSA-5mqj-xc49-246p

crewjam/saml vulnerable to Denial Of Service Via Deflate Decompression Bomb

MEDIUM 41CWE-770Published 2023-03-22 · Updated 2025-02-25

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-770.

Summary

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 crash since the operating system kills the process. This issue is patched in version 0.4.13.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00957 61st percentileScored 2026-11-07

Fix Fixed saml (crewjam): 0.4.13github.com/crewjam/saml (Go): 0.4.13

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
crewjam	saml	before 0.4.13	0.4.13	Patch available	CNA
—	github.com/crewjam/saml (Go)	before 0.4.13	0.4.13	Patch available	GHSA-5mqj-xc49-246p

saml Vendorcrewjam Affected before 0.4.13 Fixed in 0.4.13 Patch available CNA
github.com/crewjam/saml (Go) Vendor— Affected before 0.4.13 Fixed in 0.4.13 Patch available GHSA-5mqj-xc49-246p

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:saml_project:saml:0.4.12:::::go::	0.4.12	Vulnerable	crewjam

cpe:2.3:a:saml_project:saml:0.4.12:*:*:*:*:go:*:* Versions 0.4.12 Vulnerable ·crewjam

Remediation

Fix · CNA saml (crewjam) Fixed in 0.4.13
Fix · GHSA-5mqj-xc49-246p github.com/crewjam/saml (Go) Fixed in 0.4.13 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Not affected: 4 products

Red Hat Advanced Cluster Management for Kubernetes 2
Red Hat Ceph Storage 5
Red Hat Enterprise Linux 8
Red Hat OpenShift Container Platform 4

Timeline

2026-10-02 Threatist record created from CVE-2023-28119
2026-10-03 Alias added: GHSA-5mqj-xc49-246p

References

Patch 1

https://github.com/crewjam/saml/commit/8e9236867d176ad6338c870a84e2039aef8a5021

Advisory 2

Other 1

https://github.com/crewjam/saml

TI-2022-20253 crewjam/saml go library is vulnerable to signature bypass via multiple Assertion elements CVSS 3.1CRITICAL 9.8
TI-2020-16916 Improper authentication in crewjam/saml CVSS 3.1CRITICAL 9.8
TI-2023-24482 Cross site scripting via missing binding syntax validation In ACS location in github.com/crewjam/saml CVSS 3.1HIGH 7.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences