CURL-CVE-2025-5399

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Source
https://curl.se/docs/CVE-2025-5399.html
Import Source
https://curl.se/docs/CURL-CVE-2025-5399.json
JSON Data
https://api.test.osv.dev/v1/vulns/CURL-CVE-2025-5399
Aliases
Published
2025-06-04T08:00:00Z
Modified
2026-05-29T05:40:24Z
Summary
WebSocket endless loop
Details

Due to a mistake in libcurl's WebSocket code, a malicious server can send a particularly crafted packet which makes libcurl get trapped in an endless busy-loop.

There is no other way for the application to escape or exit this loop other than killing the thread/process.

This might be used to DoS libcurl-using application.

Database specific 
{
    "CWE":  {
        "desc":  "Loop with Unreachable Exit Condition ('Infinite Loop')",
        "id":  "CWE-835"
    },
    "URL":  "https://curl.se/docs/CVE-2025-5399.json",
    "affects":  "lib",
    "award":  {
        "amount":  "505",
        "currency":  "USD"
    },
    "issue":  "https://hackerone.com/reports/3168039",
    "last_affected":  "8.14.0",
    "package":  "curl",
    "severity":  "Low",
    "www":  "https://curl.se/docs/CVE-2025-5399.html"
}
Credits
    • z2_ on hackerone - FINDER
    • z2_ on hackerone - REMEDIATION_DEVELOPER

Affected packages

Git / github.com/curl/curl.git

Affected ranges

Type
SEMVER
Events
Introduced
8.13.0
Fixed
8.14.1
Type
GIT
Repo
https://github.com/curl/curl.git
Events
Introduced
3588df9478d7c27046b34cdb510728a26bedabc7
Fixed
d1145df24de8f80e6b167fbc4f28b86bcd0c6832

Affected versions

8.*
8.13.0
8.14.0
Other
curl-8_13_0
curl-8_14_0

Database specific

source 
"https://curl.se/docs/CURL-CVE-2025-5399.json"
vanir_signatures 
[
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "246136244445171702857622217714330817191",
            "length":  3224
        },
        "id":  "CURL-CVE-2025-5399-5c67c32b",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/curl/curl.git/commit/d1145df24de8f80e6b167fbc4f28b86bcd0c6832",
        "target":  {
            "file":  "lib/ws.c",
            "function":  "curl_ws_send"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "205927081312732682779716038169572163720",
                "200262896965368108989613347175457420328",
                "191061302736480628505507033467536312329",
                "305720063265502571742731976555669608845"
            ],
            "threshold":  0.9
        },
        "id":  "CURL-CVE-2025-5399-7940916e",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/curl/curl.git/commit/d1145df24de8f80e6b167fbc4f28b86bcd0c6832",
        "target":  {
            "file":  "lib/ws.c"
        }
    }
]
vanir_signatures_modified 
"2026-05-29T05:40:24Z"