CVE-2026-76988Public exploitNetwork attack vector

Service crash via mixed-class ForwardOpen path

Published Aug 20, 2026 · Updated Aug 20, 2026

Out-of-bounds read in the ForwardOpen handler in liftoff-sr CIPster 1802525 allows remote attackers to crash the server via a crafted request. ConnectionData::ResolveInstances accepts mixed-class application paths, and ConnectionData::CorrectSizes then treats attribute 3 from non-Assembly objects such as Identity or Ethernet Link as a ByteBuf* and calls size() on incompatible data. The issue is reachable over the normal explicit TCP messaging path without authentication; current public evidence shows a reliable server abort and availability impact, not data write or code execution.

CVSS severity5.3
Medium
EPSS probability0.42%
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 the ForwardOpen handler in liftoff-sr CIPster 1802525 allows remote attackers to crash the server via a crafted request. ConnectionData::ResolveInstances accepts mixed-class application paths, and ConnectionData::CorrectSizes then treats attribute 3 from non-Assembly objects such as Identity or Ethernet Link as a ByteBuf* and calls size() on incompatible data. The issue is reachable over the normal explicit TCP messaging path without authentication; current public evidence shows a reliable server abort and availability impact, not data write or code execution.

The record

CVE
CVE-2026-76988
Published
Aug 20, 2026
Updated
Aug 20, 2026
Vendor
liftoff-sr
Product
CIPster
Classifications
CWE-125, CWE-119, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 20, 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=1802525be27d33e19a9a83c163e331a1d13b1892

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

liftoff-sr · CIPsterversion=1802525be27d33e19a9a83c163e331a1d13b1892

Published CVSS scores

5.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
5.5VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
5.0VulDBAV:N/AC:L/Au:N/C:N/I:N/A: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-125Out-of-bounds Read
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1499.004Endpoint Denial of Service Application 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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