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TI-2026-08365 Aliases CVE-2026-9521GHSA-xvwh-vh35-wwv2

fraillt bitsery std_smart_ptr.h loadFromSharedState improper validation of specified type of input

Priority HIGH 67CWE-1287Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
Low · Low · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

A security vulnerability has been detected in fraillt bitsery up to 5.2.4. Affected is the function loadFromSharedState in the library include/bitsery/ext/std_smart_ptr.h. Such manipulation leads to improper validation of specified type of input. It is possible to launch the attack remotely. The exploit has been disclosed publicly and may be used. Upgrading to version 5.2.5 is able to address this issue. The name of the patch is 66d16516e24893bebc1c8af52bf2fe9ad0735061. Upgrading the affected component is advised.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00401 34th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed bitsery (fraillt): 5.2.5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
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

VendorProductAffected versionsFixed inStatusSource
frailltbitsery5.2.0; 5.2.1; 5.2.2; 5.2.3; 5.2.45.2.5Patch availableCNA
  • bitsery Vendorfraillt Affected 5.2.0; 5.2.1; 5.2.2; 5.2.3; 5.2.4 Fixed in 5.2.5 Patch available CNA

CPE names CNA · 1

CPEVersionsRoleVendor
cpe:2.3:a:fraillt:bitsery:*:*:*:*:*:*:*:*——fraillt
  • cpe:2.3:a:fraillt:bitsery:*:*:*:*:*:*:*:* Versions — — ·fraillt

Remediation

  • Fix · CNA bitsery (fraillt) Fixed in 5.2.5

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-9521
  2. 2026-10-03 Alias added: GHSA-xvwh-vh35-wwv2

References

Exploit 1

Patch 2

Other 2

Sources

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