7.5

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

Modified
AliasesUBUNTU-CVE-2023-28119GHSA-5mqj-xc49-246pGO-2023-1664
Published 22-03-2023Last modified 25-02-2025

Vulnerability summary

CVE-2023-28119 is a high (CVSS 7.5) vulnerability in crewjam saml. EPSS estimates a 0.96% chance of exploitation in the next 30 days, higher than 61.4% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.5 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.96%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 0 · Related 2
CGA-CRWM-VX7G-3VQ8CGA-WC6X-6475-2649

Timeline

  1. 22-03-2023
    PublishedVulnerability first disclosed.
  2. 25-02-2025
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.96%

Chance of exploitation in the next 30 days

Percentile

61%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.96% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Crewjam1 product
Github.com/crewjam1 product
  • saml< 0.4.13
Saml_project1 product
Ubuntu1 product
  • golang-github-crewjam-samlAll versions (No fix recorded)

4 vendors · 4 products

References

6 links