CVE-2026-6554

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Source
https://cve.org/CVERecord?id=CVE-2026-6554
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-6554.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-6554
Downstream
Related
Published
2026-09-05T18:51:02Z
Modified
2026-09-17T18:26:47Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
infinte loop in libpcap before 1.10.7
Details

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.

Database specific 
{
    "cna_assigner":  "Tcpdump",
    "cwe_ids":  [
        "CWE-835"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6554.json"
}
References

Affected packages

Git / github.com/the-tcpdump-group/libpcap

Affected ranges

Type
GIT
Repo
https://github.com/the-tcpdump-group/libpcap
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
ff3c83475ac303c6b681c52ad0b6e14795a8e0ce
Database specific
Show details 
{
    "extracted_events":  [
        {
            "introduced":  "0"
        },
        {
            "fixed":  "1.10.7"
        }
    ],
    "source":  [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

libpcap-0.*
libpcap-0.6.1
libpcap-0.7.1
libpcap-0.8-bp
libpcap-1.*
libpcap-1.10-bp
libpcap-1.10.0
libpcap-1.10.1
libpcap-1.10.2
libpcap-1.10.3
libpcap-1.10.4
libpcap-1.10.5
libpcap-1.10.6
libpcap-1.7.0-bp
libpcap-1.8.0-bp
libpcap-1.8.1
libpcap-1.9-bp
libpcap-1.9.0-rc1

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-6554.json"
vanir_signatures 
[
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "176251572843044530277624267713980694612",
            "length":  1436
        },
        "id":  "CVE-2026-6554-697a4abe",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/the-tcpdump-group/libpcap/commit/ff3c83475ac303c6b681c52ad0b6e14795a8e0ce",
        "target":  {
            "file":  "bpf_filter.c",
            "function":  "pcapint_validate_filter"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "260368575878382541624670762537255236354",
                "270302858585418669486197623206375452003",
                "319084393174427731991634934320312903128",
                "201636556515746756313257798867805842450",
                "18381590733007613273981415303643613479",
                "283799456181508361809190560147858478812",
                "195412407350984622946698686548069717713",
                "193595949453106055179176065392579107421",
                "112116824152779515061715563043132481161",
                "205856890806059150342612842144881273003",
                "155923389134453085717980298750509394391",
                "291766890536457417112182997295068003799",
                "263682808840101929936751009523121514003",
                "113396661104202056140385670359028627634",
                "177031913021320221985709304935068917325"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2026-6554-bedb3f50",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/the-tcpdump-group/libpcap/commit/ff3c83475ac303c6b681c52ad0b6e14795a8e0ce",
        "target":  {
            "file":  "bpf_filter.c"
        }
    }
]
vanir_signatures_modified 
"2026-09-10T08:25:19Z"