CVE Explorer

CVE-2026-27448

pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 0.14.0 and prior to version 26.0.0, if a user provided callback to `set_tlsext_servername_callback` raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it. Starting in version 26.0.0, unhandled exceptions now result in rejecting the connection.

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:f373111a8a0f3c5228ed412ae879fe16263ff8854140a03dac3371014a2e80d5

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"pyopenssl","vendor":"pyca","versions":[{"status":"affected","version":">= 0.14.0, < 26.0.0"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:23bcda7c4cc079e54cfa6941f14e609d6c942079c28f59f938d1b07c53523dd6 · sha256:96ea811b5e0ff604… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"HIGH","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":1.7,"baseSeverity":"LOW","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:23bcda7c4cc079e54cfa6941f14e609d6c942079c28f59f938d1b07c53523dd6 · sha256:96ea811b5e0ff604… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion

{"cweId":"CWE-636","description":"CWE-636: Not Failing Securely ('Failing Open')","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:23bcda7c4cc079e54cfa6941f14e609d6c942079c28f59f938d1b07c53523dd6 · sha256:96ea811b5e0ff604… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions

{"name":"https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst#L27","tags":["x_refsource_MISC"],"url":"https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst#L27"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:23bcda7c4cc079e54cfa6941f14e609d6c942079c28f59f938d1b07c53523dd6 · sha256:96ea811b5e0ff604… · /containers/cna/references/2

{"name":"https://github.com/pyca/pyopenssl/commit/d41a814759a9fb49584ca8ab3f7295de49a85aa0","tags":["x_refsource_MISC"],"url":"https://github.com/pyca/pyopenssl/commit/d41a814759a9fb49584ca8ab3f7295de49a85aa0"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:23bcda7c4cc079e54cfa6941f14e609d6c942079c28f59f938d1b07c53523dd6 · sha256:96ea811b5e0ff604… · /containers/cna/references/1

{"name":"https://github.com/pyca/pyopenssl/security/advisories/GHSA-vp96-hxj8-p424","tags":["x_refsource_CONFIRM"],"url":"https://github.com/pyca/pyopenssl/security/advisories/GHSA-vp96-hxj8-p424"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:23bcda7c4cc079e54cfa6941f14e609d6c942079c28f59f938d1b07c53523dd6 · sha256:96ea811b5e0ff604… · /containers/cna/references/0

Attribution and limitations

CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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