CVE-2026-90558Network attack vector

Arbitrary code execution via oversized SIP header formatting

Published Sep 12, 2026 · Updated Sep 12, 2026

Stack buffer overflows in Irontec sngrep 1.8.4 and earlier allow remote attackers to crash the process or execute code via crafted SIP packets. The SIP attribute-formatting path copies oversized Call-ID, X-Call-ID, and other header values into fixed 255-byte stack buffers without enforcing destination bounds. Exploitation requires the packet to reach an active capture or be opened from a PCAP; a successful attempt interrupts monitoring or runs code in the sngrep process.

CVSS severityUnavailable
Unscored
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflows in Irontec sngrep 1.8.4 and earlier allow remote attackers to crash the process or execute code via crafted SIP packets. The SIP attribute-formatting path copies oversized Call-ID, X-Call-ID, and other header values into fixed 255-byte stack buffers without enforcing destination bounds. Exploitation requires the packet to reach an active capture or be opened from a PCAP; a successful attempt interrupts monitoring or runs code in the sngrep process.

The record

CVE
CVE-2026-90558
Published
Sep 12, 2026
Updated
Sep 12, 2026
Vendor
Irontec
Product
sngrep
Classifications
T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 12, 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=0 <=1.8.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Irontec · sngrepversion=0 <=1.8.4

Published CVSS scores

No CVSS assessment is available in this record.

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.

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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 exploitUnconfirmed

Weakness, pattern, technique

T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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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