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GHSA-6g43-577r-wf4x

HighCVSS 7.1 / 10
Published Mar 18, 2026·Last modified Mar 23, 2026
Affected Components(0)

No affected components available

Description

Impact

This is an out-of-bounds slice access vulnerability in the CHF nchf-convergedcharging service. A valid authenticated request to PUT /nchf-convergedcharging/v3/recharging/:ueId?ratingGroup=... can trigger a server-side panic in github.com/free5gc/chf/internal/sbi.(*Server).RechargePut(...) due to an out-of-range slice access. In the reported runtime, Gin recovery converts the panic into HTTP 500, but the recharge path remains remotely panic-triggerable and can be abused repeatedly to degrade recharge functionality and flood logs. In deployments without equivalent recovery handling, this panic may cause more severe service disruption.

Patches

https://github.com/free5gc/chf/pull/61

Workarounds

  • Restrict access to the nchf-convergedcharging recharge endpoint to strictly trusted NF callers only.
  • Apply rate limiting or network ACLs in front of the CHF SBI interface to reduce repeated panic-trigger attempts.
  • If the recharge API is not required, temporarily disable or block external reachability to this route.
  • Ensure panic recovery, monitoring, and alerting are enabled.
Risk Scores
Base Score
7.1

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability.

Threat Intelligence
4.9

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
0.40%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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High severity
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