CVE-2026-78157Public exploitNetwork attack vector

Authenticated PCRF crash via undersized address AVP

Published Aug 24, 2026 · Updated Aug 24, 2026

Out-of-bounds read in Open5GS 2.8.0 allows remote authenticated users to crash the PCRF with a malformed Rx AA-Request. The pcrf_rx_aar_cb function passes a short Framed-IP-Address AVP buffer to a hash lookup that always reads a four-byte IPv4 key. Reachability requires a Diameter connection as an Rx peer; one malformed request reads past the AVP buffer and crashes the PCRF process.

CVSS severity7.4
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Open5GS 2.8.0 allows remote authenticated users to crash the PCRF with a malformed Rx AA-Request. The pcrf_rx_aar_cb function passes a short Framed-IP-Address AVP buffer to a hash lookup that always reads a four-byte IPv4 key. Reachability requires a Diameter connection as an Rx peer; one malformed request reads past the AVP buffer and crashes the PCRF process.

The record

CVE
CVE-2026-78157
Published
Aug 24, 2026
Updated
Aug 24, 2026
Vendor
Open5GS
Product
Open5GS
Classifications
CWE-125, CWE-119, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.8.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Open5GS · Open5GSversion=2.8.0

Published CVSS scores

7.4VulDB CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L
6.5VulDB CNAAV:N/AC:L/Au:S/C:P/I:P/A:P
5.3VulDB CNACVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-125Out-of-Bounds Read
CWE-119Memory Corruption
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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