TI-2026-05744 Aliases CVE-2026-6554 GHSA-2c9f-8whq-v3fc

infinte loop in libpcap before 1.10.7

LOW 33CWE-835Published 2026-09-05 · Updated 2026-10-22

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Partial Red Hat: 7 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-835.

Summary

libpcap BPF interpreter treats the offset in the 'ja L' BPF instruction as a signed integer to implement looping via backward jumps, but it does not limit the number of loop iterations. A crafted filter program or the 'protochain' primitive used on a crafted network packet can cause the interpreter to loop infinitely.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.0044 38th percentileScored 2026-11-07

Fix Partial libpcap (The Tcpdump Group): 1.10.7Red Hat: 7 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

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

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
The Tcpdump Group	libpcap	before 1.10.7	1.10.7	Patch available	CNA

libpcap VendorThe Tcpdump Group Affected before 1.10.7 Fixed in 1.10.7 Patch available CNA

Remediation

Fix · CNA libpcap (The Tcpdump Group) Fixed in 1.10.7

Fixed in the same release

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

Release · 2026-09-05
The Tcpdump Group libpcap 1.10.7
7 records Highest priority Priority LOW 7 LOW
Other records, highest priority first
- TI-2026-00582 OOBR and OOBW in libpcap before 1.10.7Priority LOW 36
- TI-2026-24461 OOBR in libpcap before 1.10.7Priority LOW 24
- TI-2026-24460 abort() in libpcap before 1.10.7 on an invalid BPF opcodePriority LOW 24
Show all 7 records →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Enterprise Linux 10	Affected	No fix yet
Red Hat Enterprise Linux 6	Affected	No fix yet
Red Hat Enterprise Linux 7	Affected	No fix yet
Red Hat Enterprise Linux 8	Affected	No fix yet
Red Hat Enterprise Linux 9	Affected	No fix yet
Red Hat OpenShift Container Platform 4	Affected	No fix yet
Red Hat OpenShift Container Platform 5	Affected	No fix yet

Timeline

2026-10-02 Threatist record created from CVE-2026-6554
2026-10-03 Alias added: GHSA-2c9f-8whq-v3fc
2026-10-20 Affected versions changed · Red Hat
2026-10-20 CVSS score changed · Red Hat
2026-10-22 CVSS score changed · CNA
2026-10-30 Affected versions changed · Red Hat

References

Patch 1

https://github.com/the-tcpdump-group/libpcap/commit/ff3c83475ac303c6b681c52ad0b6e14795a8e0ce

TI-2007-03684 Integer overflow in print-bgp.c in the BGP dissector in tcpdump 3.9.6 and earlier allows… CVSS 3.1CRITICAL 9.8
TI-2004-00159 Integer underflow in the isakmp_id_print for TCPDUMP 3.8.1 and earlier allows remote… CVSS 2.0MEDIUM 5.0
TI-2018-10700 The BGP parser in tcpdump before 4.9.3 has a buffer over-read in… CVSS 3.1CRITICAL 9.8
TI-2017-09693 The RPKI-Router parser in tcpdump before 4.9.2 has a buffer over-read in print-rpki-rtr.c:rpki_rtr_pdu_print(). CVSS 3.1CRITICAL 9.8
TI-2017-09684 The ICMPv6 parser in tcpdump before 4.9.2 has a buffer over-read in print-icmp6.c:icmp6_nodeinfo_print(). CVSS 3.1CRITICAL 9.8
TI-2017-09683 The MPTCP parser in tcpdump before 4.9.2 has a buffer over-read in print-mptcp.c, several functions. CVSS 3.1CRITICAL 9.8

See all 190 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences