CVE-2026-111458

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Source

https://cve.org/CVERecord?id=CVE-2026-111458

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-111458.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-111458

Downstream

Published

2026-10-16T05:24:43Z

Modified

2026-10-17T07:06:49Z

Severity

6.8 (Medium) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N CVSS Calculator

Summary

ssldump Heap Buffer Overflow in FAN/1 X.509 Fingerprint Formatting

Details

The fanx_fingerprint function in ssl/sslxprint.c of ssldump allocates a heap buffer for formatting FAN/1 X.509 certificate fingerprints. The allocation size is computed as strlen(b64) + strlen(hex) + 31, but the format string "fan1:x509:server:passive:%s:sha256:%s" contains 33 fixed characters in addition to the two variable-length fields and a null terminator, requiring strlen(b64) + strlen(hex) + 34 bytes. This miscalculation results in a 3-byte heap-based buffer overflow on every invocation of the function with valid inputs. The overflow occurs because sprintf writes the full formatted string into the undersized heap buffer without bounds checking. An attacker who can supply a crafted pcap file containing a TLS X.509 certificate to a user running ssldump with FAN/1 fingerprinting enabled (for example with the -j -N options) can trigger the overflow. The resulting heap corruption may lead to denial of service through a crash or, in a worst-case scenario, arbitrary code execution in the context of the user running ssldump. The vulnerability is deterministic and requires no special privileges beyond the ability to provide input to the tool.

Database specific

{
    "cna_assigner":  "CIRCL",
    "cwe_ids":  [
        "CWE-122",
        "CWE-787"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111458.json",
    "unresolved_ranges":  [
        {
            "extracted_events":  [
                {
                    "last_affected":  "1.9.0"
                }
            ],
            "source":  "AFFECTED_FIELD"
        }
    ]
}

References

Affected packages

Git / github.com/adulau/ssldump

Affected ranges

Type

GIT

Repo

https://github.com/adulau/ssldump

Events

Introduced

Fixed

8ad55683cc0186600c085d33be5a5b627db78467

Database specific

Show details

{
    "source":  "REFERENCES"
}

Affected versions

v1.*

v1.0

v1.1

v1.2

v1.3

v1.4

v1.5

v1.6

v1.7

v1.8

v1.9

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-111458.json"

vanir_signatures

[
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "510039385989487037045728603664280697",
                "127990277942465140663423377865012603207",
                "124647905535989963762321317946188733745",
                "332072285688844344409105221852350299799",
                "165716255764989808248722316343214024569",
                "139945216499888525121592812304512438246",
                "189145275945414593368308607797664175991",
                "190391138778396386108148741691859217834",
                "185876719717789322895824523901742620722",
                "90483806019768471015910088913228624311",
                "171151310683951189196588309746972149468",
                "142863992975236173410592642794980467183"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2026-111458-386aa67e",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/adulau/ssldump/commit/8ad55683cc0186600c085d33be5a5b627db78467",
        "target":  {
            "file":  "ssl/sslxprint.c"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "319792200987144428493942530647831894765",
            "length":  402
        },
        "id":  "CVE-2026-111458-7bae3a19",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/adulau/ssldump/commit/8ad55683cc0186600c085d33be5a5b627db78467",
        "target":  {
            "file":  "ssl/sslxprint.c",
            "function":  "fanx_fingerprint"
        }
    }
]

vanir_signatures_modified

"2026-10-17T07:06:49Z"