CURL-CVE-2026-80229

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Source
https://curl.se/docs/CVE-2026-80229.html
Import Source
https://curl.se/docs/CURL-CVE-2026-80229.json
JSON Data
https://api.osv.dev/v1/vulns/CURL-CVE-2026-80229
Aliases
Published
2026-09-02T08:00:00Z
Modified
2026-10-09T13:05:29Z
Summary
OpenSSL provider use-after-free
Details

When performing transfers via libcurl’s multi interface, pooled TLS connections can outlive their originating easy handles. In OpenSSL 3 provider configurations, libcurl attaches an allocated library context to the easy handle's state and passes it to OpenSSL without acquiring an ownership reference; destroying the easy handle prematurely frees this context while the active connection retains a dangling pointer, leading to a heap-use-after-free upon subsequent I/O or post-handshake operations.

Database specific 
{
    "CWE":  {
        "desc":  "Use After Free",
        "id":  "CWE-416"
    },
    "URL":  "https://curl.se/docs/CVE-2026-80229.json",
    "affects":  "both",
    "issue":  "https://hackerone.com/reports/3969255",
    "last_affected":  "8.21.0",
    "package":  "curl",
    "severity":  "Low",
    "www":  "https://curl.se/docs/CVE-2026-80229.html"
}
Credits
    • Stanislav Fort (Aisle Research) - FINDER
    • Daniel Stenberg - REMEDIATION_DEVELOPER

Affected packages

Git / github.com/curl/curl.git

Affected ranges

Type
SEMVER
Events
Introduced
8.14.0
Fixed
8.14.2
Introduced
8.15.0
Fixed
8.16.1
Introduced
8.17.0
Fixed
8.20.1
Introduced
8.21.0
Fixed
8.22.0
Type
GIT
Repo
https://github.com/curl/curl.git
Events
Introduced
f2ce6c46b9dcc46ced0ce43fa95176ea7599a854
Fixed
7ea37abc6ac0120ba5f6d94be8d196f7cf1506bb

Affected versions

8.*
8.14.0
8.14.1
8.15.0
8.16.0
8.17.0
8.18.0
8.19.0
8.20.0
8.21.0
Other
curl-8_14_0
curl-8_14_1
curl-8_15_0
curl-8_16_0
curl-8_17_0
curl-8_18_0
curl-8_19_0
curl-8_20_0
curl-8_21_0
rc-8_18_0-1
rc-8_18_0-2
rc-8_18_0-3
rc-8_19_0-1
rc-8_19_0-2
rc-8_19_0-3
rc-8_20_0-1
rc-8_20_0-2
rc-8_20_0-3
rc-8_21_0-1
rc-8_21_0-2
rc-8_21_0-3
rc-8_22_0-1
rc-8_22_0-2

Database specific

source 
"https://curl.se/docs/CURL-CVE-2026-80229.json"
vanir_signatures 
[
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "286481243370392075526062118659509114348",
                "196216237767420629426097604457509099271",
                "68125101134514249852390309734181512406",
                "31227070220736528463295638619520929314"
            ],
            "threshold":  0.9
        },
        "id":  "CURL-CVE-2026-80229-49021c9f",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/curl/curl.git/commit/7ea37abc6ac0120ba5f6d94be8d196f7cf1506bb",
        "target":  {
            "file":  "lib/vtls/openssl.c"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "93812128733312520413839406253910216274",
            "length":  4945
        },
        "id":  "CURL-CVE-2026-80229-74875d56",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/curl/curl.git/commit/7ea37abc6ac0120ba5f6d94be8d196f7cf1506bb",
        "target":  {
            "file":  "lib/vtls/openssl.c",
            "function":  "Curl_ossl_ctx_init"
        }
    }
]
vanir_signatures_modified 
"2026-10-09T13:05:29Z"