What’s Vulnerable › Vulnerabilities

CVE-2023-28119: crewjam/saml vulnerable to Denial Of Service Via Deflate Decompression Bomb

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-03-22 · updated 2026-06-17
• Weakness: CWE-770

Description

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.

Affected products

• crewjam saml: 0.4.12

References

• https://github.com/crewjam/saml/commit/8e9236867d176ad6338c870a84e2039aef8a5021
• https://github.com/crewjam/saml/security/advisories/GHSA-5mqj-xc49-246p
• https://github.com/crewjam/saml/commit/8e9236867d176ad6338c870a84e2039aef8a5021
• https://github.com/crewjam/saml/security/advisories/GHSA-5mqj-xc49-246p

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