1sealsemantic last-mile verification

Research / Finding

OpenSSL: unauthorized OCSP responders

F-OPENSSL-OCSP-001

Read the full technical write-up →

Root cause, affected code and disclosure timeline.

At a glance

Conditions
OpenSSL 3.6 stapled OCSP verification can accept a response from an unauthorized certificate supplied in the peer chain.
What to do
Check that your build includes the recorded master or openssl-3.6 fix. A released version is not established by this write-up; PR #30323 itself was closed without merge.

1seal reading guide, reviewed 2026-09-25 against the linked records. Not a new vendor assessment or a device rollout check.

Fix and severity by source

Source assessments remain separate. Different CVSS versions are not a revision of one another. Code fixes, released versions and deployed updates are distinct evidence.

A response signature can validate while the signer is not authorized to answer for the certificate. The reported gap concerns OpenSSL 3.6 stapled OCSP verification.

Public snapshot: 26 Sep 2026. Status, releases and attribution belong to each source below; none is inferred from another record.

Read the evidence · View in research browse

Recorded evidence

—score not recorded
1SEAL-2026-0091SEAL advisoryopenssl/openssl

OpenSSL 3.6 stapled OCSP verification can accept unauthorized responders from the peer chain

Fixed in: master and openssl-3.6 fixes published

Fix recordednot counted
details
Finding IDs
F-OPENSSL-OCSP-001
Status
patched
CWE
CWE-295
Fixed in
master and openssl-3.6 fixes published
Disclosure date
Recorded severity
high

F-OPENSSL-OCSP-001: Verification failures. Stapled OCSP verification accepts an unauthorized delegated responder. Reviewed 24 Sep 2026. Mechanism assessed by 1seal.

Mechanism source for F-OPENSSL-OCSP-001

Security area (1seal assessment): Authorization. Stapled OCSP verification accepts an unauthorized delegated responder. Reviewed 24 Sep 2026.

—score not recorded
openssl/openssl #30323Security PRopenssl/openssl

x509: reject unauthorized stapled OCSP response signers

applied upstream
details
Finding IDs
F-OPENSSL-OCSP-001
Status
applied upstream
Reported date
Rationale
prevents accepting stapled OCSP responses signed by unauthorized responder certificates.
PR opened by
@1seal
PR state observed
closed; GitHub merged: false; 2026-09-24
PR observation basis
Public PR metadata recorded in the 2026-09-24 evidence audit; not a live status feed.
Contribution boundary
@1seal opened this PR; this alone does not establish sole code authorship.

F-OPENSSL-OCSP-001: Verification failures. Stapled OCSP verification accepts an unauthorized delegated responder. Reviewed 24 Sep 2026. Mechanism assessed by 1seal.

Mechanism source for F-OPENSSL-OCSP-001

Security area (1seal assessment): Authorization. Stapled OCSP verification accepts an unauthorized delegated responder. Reviewed 24 Sep 2026.

Clarify or correct this record privately. The email subject includes the finding ID. For an existing case, continue the agreed private thread. Do not post unpublished vulnerability details in public issues. Research disclosure policy.

How this page groups evidence

This identifier groups recorded evidence; it is not an additional CVE, independent-vulnerability count or guarantee of vendor confirmation. Fixed code, released versions, attribution and independent discovery are distinct claims. Absent metadata means not recorded, not disproved. Counting rules.