Your RSA-2048 keys break in 2030. Find every one of them before attackers do.
Maven
Not in CISA KEV
MEDIUM severity

CVE-2019-10755

MEDIUM

CVE-2019-10755 is a medium-severity (CVSS 4.9) CWE-338 vulnerability in org.pac4j:pac4j-saml. O3 Security confirms whether CVE-2019-10755 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.

Use of Cryptographically Weak Pseudo-Random Number Generator in org.pac4j:pac4j-saml

Also known asGHSA-rc75-cf5c-mxvhSNYK-JAVA-ORGPAC4J-467407
Published
Sep 23, 2019
Updated
Jul 9, 2026
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Jul 9, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected
org.pac4j:pac4j-saml

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

The SAML identifier generated within SAML2Utils.java was found to make use of the apache commons-lang3 RandomStringUtils class which makes them predictable due to RandomStringUtils PRNG's algorithm not being cryptographically strong. This issue only affects the 3.X release of pac4j-saml.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
Mavenorg.pac4j:pac4j-samlall versions3.8.2

Detection & mitigation playbook

Open-source dependency
  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.pac4j:pac4j-saml. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

  2. Fix

    Update org.pac4j:pac4j-saml to 3.8.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2019-10755 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

  4. How O3 protects you

    O3 pinpoints whether CVE-2019-10755 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to CVE-2019-10755. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

The SAML identifier generated within SAML2Utils.java was found to make use of the apache commons-lang3 RandomStringUtils class which makes them predictable due to RandomStringUtils PRNG's algorithm not being cryptographically strong. This issue only affects the 3.X release of pac4j-saml.
O3 Security · Impact-Aware SCA

Is CVE-2019-10755 in your dependencies?

O3 detects CVE-2019-10755 across Maven dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

CVE-2019-10755: pac4j-saml (Medium 4.9) | O3 Security