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CVE-2026-6554— infinte loop in libpcap before 1.10.7

Quick assessment

Affected
The Tcpdump Group libpcap
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

libpcap 的 BPF 解释器将 'ja L' BPF 指令中的偏移量视为有符号整数，以实现通过向后跳转构成的循环，但没有限制循环迭代次数。在某些不常见的使用场景中，一个精心构造的过滤程序可能导致解释器陷入无限循环。

CVSS 5.5 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
The Tcpdump Group libpcap < 1.10.7 affected
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I. Basic Information for CVE-2026-6554

Vulnerability Information
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Vulnerability Title
infinte loop in libpcap before 1.10.7
Source: CVE Program / CVE List V5
Vulnerability Description
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. In particular uncommon use cases a crafted filter program can cause the interpreter to loop infinitely.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
The Tcpdump Group libpcap 0 ~ 1.10.7 -

II. Public POCs for CVE-2026-6554

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III. Intelligence Information for CVE-2026-6554

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Patches & Fixes for CVE-2026-6554 (1)

Same Patch Batch · The Tcpdump Group · 2026-09-05 · 7 CVEs total

CVE-2026-0799 8.7 HIGH OOBR and OOBW in libpcap before 1.10.7
CVE-2026-6244 5.5 MEDIUM division by zero in libpcap before 1.10.7
CVE-2026-31911 5.5 MEDIUM abort() in libpcap before 1.10.7 on an invalid BPF opcode
CVE-2026-31912 5.5 MEDIUM OOBR in libpcap before 1.10.7
CVE-2026-18238 5.0 MEDIUM OOBR in rpcap client in libpcap before 1.10.7
CVE-2026-18313 4.3 MEDIUM rpcapd memory leak in libpcap before 1.10.7

IV. Related Vulnerabilities

Same product: libpcap
Same vendor: The Tcpdump Group
Same weakness: CWE-835

V. Comments for CVE-2026-6554

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