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PatchSiren cyber security CVE debrief

CVE-2026-104598 Osmocom CVE debrief

CVE-2026-104598 is a vulnerability in libosmo-sigtran through 2.2.1, allowing remote attackers to obtain sensitive information via an out-of-bounds read in the M3UA NOTIFY decoder. This vulnerability affects libosmo-sigtran installations, which defenders should assess for exposure and prioritize patching to prevent potential data exposure. The CVE record and NVD entry provide limited information about the vulnerability, and further verification is required to determine the affected versions and potential impact.

Vendor
Osmocom
Product
libosmo-sigtran
CVSS
Unknown
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-26
Original CVE updated
2026-10-27
Advisory published
2026-10-26
Advisory updated
2026-10-27

Who should care

Defenders responsible for libosmo-sigtran installations should assess exposure and prioritize patching to prevent potential data exposure. This includes operators, platform administrators, vulnerability management teams, and security teams who need to review and verify vulnerable installations. They should also monitor for potential exploitation attempts and review compensating controls for exposed systems while rem

Why it matters

CVE-2026-104598 is a vulnerability in libosmo-sigtran that allows remote attackers to obtain sensitive information. Defenders should prioritize verifying and patching vulnerable installations to prevent potential data exposure.

  • Sensitive information disclosure
  • Potential data exposure through remote attacks

Technical summary

The vulnerability is caused by an out-of-bounds read in the M3UA NOTIFY decoder in src/m3ua.c of libosmo-sigtran through 2.2.1. This allows remote attackers to obtain sensitive information. Defenders should prioritize verifying and patching vulnerable libosmo-sigtran installations to prevent potential data exposure. The affected product context indicates that libosmo-sigtran installations are at risk.

Defensive priority

Defenders should prioritize verifying and patching vulnerable libosmo-sigtran installations.

Recommended defensive actions

  • Verify libosmo-sigtran installations for vulnerability
  • Patch vulnerable installations
  • Monitor for potential exploitation attempts

Evidence notes

The CVE record and NVD entry provide limited information about the vulnerability. Further verification is required to determine the affected versions and potential impact.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-104598 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-104598

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-104598 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-104598

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.