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major vulnerability· requires attention

Widespread SDK auth bypass enabling impersonation across apps; critical disruption potential.

Cryptography

CVE-2026-9058

9.3
Critical
EPSS 0.31%Patch availableMay 26, 2026

Auth bypass in Szafir SDK due to unverified certificate chain.

common questions

Is CVE-2026-9058 being exploited?

Not confirmed. CVE-2026-9058 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.31% probability of exploitation in the next 30 days.

How severe is CVE-2026-9058?

CVE-2026-9058 is rated Critical with a CVSS score of 9.3. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.

Is there a patch for CVE-2026-9058?

Yes. A fix has been recorded for CVE-2026-9058. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.

What does CVE-2026-9058 affect?

CVE-2026-9058 affects Szafir SDK. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.

What should I do about CVE-2026-9058?

Upgrade to v463+; apply vendor patch.

Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.

executive summary
technical analysis
affected
Szafir SDK
impact

Authentication bypass allows impersonation by accepting signatures from unverified certs during verification.

action required

Immediate action required

affected versions
Krajowa Izba Rozliczeniowa Szafir SDK
  • affected< 1.8.463.2

As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.

how to fix
Remediation steps are tailored for users whose stack is affected. Add this technology to your stack to see the fix checklist.
references
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