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TI-2026-85171 Aliases CVE-2026-122130GHSA-78x2-g79m-42h2

Integer overflow in CESNET ipfixcol2 Forwarder plugin enables heap overflow

Priority MEDIUM 42CWE-190Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
None · Low · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

CESNET ipfixcol2 from 2.3.0 before 2.9.0 contains an integer overflow in the Forwarder output plugin (CWE-190). Because message length counters wrap around, an unauthenticated IPFIX exporter can overflow a heap buffer by sending near-65535-byte data sets and large templates to a collector forwarding over TCP. A successful attack crashes the collector and allows 2-byte writes to attacker-influenced addresses.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Description from the CNA

CESNET ipfixcol2 2.3.0 before 2.9.0 contains an integer overflow vulnerability in the Forwarder output plugin that allows unauthenticated IPFIX exporters to overflow a heap buffer by wrapping uint16_t message length counters. Attackers can send near-65535-byte data sets and large templates to a collector forwarding over TCP to crash it and perform 2-byte writes to attacker-influenced addresses.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00318 24th percentileScored 2026-11-07
Fix Fixed ipfixcol2 (CESNET): 2.9.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
CESNETipfixcol22.3.0 to before 2.9.02.9.0Patch availableCNA
  • ipfixcol2 VendorCESNET Affected 2.3.0 to before 2.9.0 Fixed in 2.9.0 Patch available CNA

Remediation

Update ipfixcol2 to version 2.9.0, which fixes this issue. The sources list no fixed version for any other release line.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

  • Fix · CNA ipfixcol2 (CESNET) Fixed in 2.9.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    CESNET ipfixcol2 2.9.0

    3 records Highest priority Priority MEDIUM 2 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-85169 Heap buffer overflow in CESNET ipfixcol2 TCP LZ4 decoderPriority MEDIUM 44
    • TI-2026-85170 Memory exhaustion in CESNET ipfixcol2 via TCP LZ4 decoderPriority LOW 37
    Show all 3 records →

Timeline

  1. 2026-11-04 Threatist record created from CVE-2026-122130
  2. 2026-11-04 Alias added: GHSA-78x2-g79m-42h2
  3. 2026-11-05 CISA SSVC decision points changed
  4. 2026-11-05 Priority changed: MEDIUM → LOW
  5. 2026-11-06 Priority changed: LOW → MEDIUM

References

Patch 1

Other 3

  • TI-2026-32573 libyang: lyb_read_string() integer overflow → heap buffer overflow CVSS 3.1HIGH 7.5
  • TI-2023-11820 libyang from v2.0.164 to v2.1.30 was discovered to contain a NULL pointer dereference via… CVSS 3.1HIGH 7.5
  • TI-2026-79264 Uninitialized pointer free in libyang NETCONF RPC parser CVSS 4.0MEDIUM 6.0
  • TI-2019-13946 Stack-based buffer overflow in Red Hat libyang CVSS 3.1CRITICAL 9.8
  • TI-2019-13945 Stack-based buffer overflow in Red Hat libyang CVSS 3.1CRITICAL 9.8
  • TI-2019-11637 The proxystatistics module before 3.1.0 for SimpleSAMLphp allows SQL Injection in lib/Auth/Process/DatabaseCommand.php. CVSS 3.0CRITICAL 9.8
See all 25 →

Sources

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