CVE-2026-57826: openHiTLS versions 0.2.0 through 0.3.2 have a
Affects openHiTLSSource CVE Database V5
Not known to be exploited · CVSS 6.8 Medium.
Data as of 26 Oct 2026, 13:47 UTC
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 18% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:NExploitation evidence
Disclosed: evidence found.
CVE published 18 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
GitHubopenhitls/openHiTLSpkg:github/openhitls/openHiTLSOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
Users should monitor vendor communications for patches addressing this certificate validation issue.
Description
openHiTLS versions 0.2.0 through 0.3.2 have a vulnerability in their X.509 certificate chain verification process. Specifically, the basic constraints extension and CA flag checks for intermediate certificate authorities (CAs) are only performed on version 3 certificates, while version 1 and 2 certificates bypass these checks. This flaw could allow improper validation of certificate chains.
References
- github.com/openHiTLS/openHiTLS/compare/openhitls-0.3.2...openhitls-0.3.3 (opens in a new tab)
- openhitls.net/zh/support/HTLS-2026-001.html (opens in a new tab)
- github.com/openHiTLS/openHiTLS/commit/4355cdf5b043d5b9ef698f8f57860f77f8e92561 (opens in a new tab)
- github.com/openHiTLS/openHiTLS/commit/2d3b221d113b452bc197012b185978b8314ee8a4 (opens in a new tab)
- gitcode.com/openHiTLS/openhitls/pull/1399 (opens in a new tab)
- gitcode.com/openHiTLS/openhitls/pull/1657 (opens in a new tab)