tlslite-ng version 0.7.3 and earlier, since commit…
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA and GitHub.
Summary
tlslite-ng version 0.7.3 and earlier, since commit d7b288316bca7bcdd082e6ccff5491e241305233 contains a CWE-354: Improper Validation of Integrity Check Value vulnerability in TLS implementation, tlslite/utils/constanttime.py: ct_check_cbc_mac_and_pad(); line "end_pos = data_len - 1 - mac.digest_size" that can result in an attacker manipulating the TLS ciphertext which will not be detected by receiving tlslite-ng. This attack appears to be exploitable via man in the middle on a network connection. This vulnerability appears to have been fixed after commit 3674815d1b0f7484454995e2737a352e0a6a93d8.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | tlslite-ng (PyPI) | before 0.7.4 | 0.7.4 | Patch available | GHSA-cwh5-3cw7-4286 |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- tlslite-ng (PyPI) Vendor— Affected before 0.7.4 Fixed in 0.7.4 Patch available GHSA-cwh5-3cw7-4286
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:tlslite-ng_project:tlslite-ng:*:*:*:*:*:*:*:* | up to 0.7.3 | Vulnerable | Tlslite-ng Project |
- cpe:2.3:a:tlslite-ng_project:tlslite-ng:*:*:*:*:*:*:*:* Versions up to 0.7.3 Vulnerable ·Tlslite-ng Project
Remediation
- Fix · GHSA-cwh5-3cw7-4286 tlslite-ng (PyPI) Fixed in 0.7.4 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2018-1000159
- 2026-10-03 Alias added: GHSA-cwh5-3cw7-4286
References
Advisory 2
Other 4
- https://github.com/tlsfuzzer/tlslite-ng/pull/234/commits/3674815d1b0f7484454995e2737a352e0a6a93d8
- https://github.com/tlsfuzzer/tlslite-ng/commit/d7b288316bca7bcdd082e6ccff5491e241305233
- https://github.com/pypa/advisory-database/tree/main/vulns/tlslite-ng/PYSEC-2018-31.yaml
- https://github.com/tomato42/tlslite-ng
More Tlslite-ng Project Tlslite-ng vulnerabilities
- TI-2020-16084 RSA vulnerability in tslite-ng CVSS 3.1HIGH 7.5
Sources
- CVE-2018-1000159 · CVE Program
- CVE-2018-1000159 · NVD
- FIRST EPSS
- GHSA-cwh5-3cw7-4286 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences