CVE-2026-39373

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Source
https://cve.org/CVERecord?id=CVE-2026-39373
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-39373.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-39373
Aliases
Downstream
Related
Published
2026-04-07T19:35:36.071Z
Modified
2026-06-18T03:57:15.905574910Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
Summary
JWCrypto: JWE ZIP decompression bomb
Details

JWCrypto implements JWK, JWS, and JWE specifications using python-cryptography. Prior to 1.5.7, an unauthenticated attacker can exhaust server memory by sending crafted JWE tokens with ZIP compression. The existing patch for CVE-2024-28102 limits input token size to 250KB but does not validate the decompressed output size. An unauthenticated attacker can cause memory exhaustion on memory-constrained systems. A token under the 250KB input limit can decompress to approximately 100MB. This vulnerability is fixed in 1.5.7.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39373.json",
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-409"
    ]
}
References

Affected packages

Git / github.com/latchset/jwcrypto

Affected ranges

Type
GIT
Repo
https://github.com/latchset/jwcrypto
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
63a78e75de7753adca47635132546d11789b90b2
Database specific 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.5.7"
        },
        {
            "introduced": "0"
        },
        {
            "fixed": "1.5.7"
        }
    ],
    "cpe": "cpe:2.3:a:latchset:jwcrypto:*:*:*:*:*:*:*:*",
    "source": [
        "AFFECTED_FIELD",
        "CPE_RANGE"
    ]
}

Affected versions

0.*
0.5.0
Other
untagged-23c3bb2e13ea18af9c56
untagged-59ed3e1fb9835e30c994
v0.*
v0.1.0
v0.2.0
v0.2.1
v0.3.0
v0.3.1
v0.4.0
v0.4.1
v0.4.2
v0.5.0
v0.6.0
v0.7.0
v0.8.0
v0.9.0
v0.9.1
v1.*
v1.0.0
v1.0.0.sig
v1.1.0
v1.2.0
v1.3.0
v1.3.1
v1.4.0
v1.4.1
v1.4.2
v1.5.0
v1.5.1
v1.5.2
v1.5.3
v1.5.4
v1.5.5
v1.5.6

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-39373.json"