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CVE-2026-42789

A flaw was found in Erlang OTP's public_key module. This vulnerability (CWE-295), related to improper certificate validation, allows a non-Certificate Authority (CA) certificate to be accepted as an intermediate issuer. A remote attacker, holding an end-entity certificate issued by a trusted CA, can exploit this by forging leaf certificates for arbitrary identities. This can lead to compromised server identity verification on the client side and client certificate verification on mutual Transpor
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:50b43a1f85766118176ce8595e637f94b59e4a05fb13cae153bbefbdc029d405
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
3

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 5 assertions

{"cpes":["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"],"defaultStatus":"unknown","modules":["pubkey_cert"],"packageName":"public_key","packageURL":"pkg:otp/public_key?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp&vcs_url=git%20https:%2F%2Fgithub.com%2Ferlang%2Fotp.git","product":"OTP","programFiles":["src/pubkey_cert.erl"],"programRoutines":[{"name":"pubkey_cert:validate_extensions/7"}],"repo":"https://github.com/erlang/otp","vendor":"Erlang","versions":[{"changes":[{"at":"1.15.1.7","status":"unaffected"},{"at":"1.17.1.3","status":"unaffected"},{"at":"1.20.3.1","status":"unaffected"}…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:3fc0879e57ee63d6a2e736449cc61f396da95a345bc3acc44b18609b9ea9b1cf · sha256:cb623582d8ed100f… · /containers/cna/affected/0

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:openstack:16.2"],"defaultStatus":"affected","packageName":"erlang","product":"Red Hat OpenStack Platform 16.2","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:3fc0879e57ee63d6a2e736449cc61f396da95a345bc3acc44b18609b9ea9b1cf · sha256:cb623582d8ed100f… · /containers/adp/1/affected/0

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:openstack:17.1"],"defaultStatus":"affected","packageName":"erlang","product":"Red Hat OpenStack Platform 17.1","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:3fc0879e57ee63d6a2e736449cc61f396da95a345bc3acc44b18609b9ea9b1cf · sha256:cb623582d8ed100f… · /containers/adp/1/affected/1

{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"],"defaultStatus":"unknown","modules":["pubkey_cert"],"packageName":"erlang/otp","packageURL":"pkg:github/erlang/otp","product":"OTP","programFiles":["lib/public_key/src/pubkey_cert.erl"],"programRoutines":[{"name":"pubkey_cert:validate_extensions/7"}],"repo":"https://github.com/erlang/otp","vendor":"Erlang","versions":[{"changes":[{"at":"26.2.5.21","status":"unaffected"},{"at":"27.3.4.12","status":"unaffected"},{"at":"28.5.0.1","status":"unaffected"},{"at":"29.0.1","status":"unaffected"}],"lessThan":"…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:3fc0879e57ee63d6a2e736449cc61f396da95a345bc3acc44b18609b9ea9b1cf · sha256:cb623582d8ed100f… · /containers/cna/affected/1

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:openstack:18.0"],"defaultStatus":"affected","packageName":"erlang","product":"Red Hat OpenStack Platform 18.0","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:3fc0879e57ee63d6a2e736449cc61f396da95a345bc3acc44b18609b9ea9b1cf · sha256:cb623582d8ed100f… · /containers/adp/1/affected/2
cvss · 2 assertions

{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":7,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:H/SI:H/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:3fc0879e57ee63d6a2e736449cc61f396da95a345bc3acc44b18609b9ea9b1cf · sha256:cb623582d8ed100f… · /containers/cna/metrics/0/cvssV4_0

{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:3fc0879e57ee63d6a2e736449cc61f396da95a345bc3acc44b18609b9ea9b1cf · sha256:cb623582d8ed100f… · /containers/adp/1/metrics/1/cvssV3_1
cwe · 3 assertions

{"cweId":"CWE-295","description":"CWE-295 Improper Certificate Validation","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:3fc0879e57ee63d6a2e736449cc61f396da95a345bc3acc44b18609b9ea9b1cf · sha256:cb623582d8ed100f… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-295","description":"Improper Certificate Validation","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:3fc0879e57ee63d6a2e736449cc61f396da95a345bc3acc44b18609b9ea9b1cf · sha256:cb623582d8ed100f… · /containers/adp/1/problemTypes/0/descriptions/0

{"cweId":"CWE-296","description":"CWE-296 Improper Following of a Certificate's Chain of Trust","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:3fc0879e57ee63d6a2e736449cc61f396da95a345bc3acc44b18609b9ea9b1cf · sha256:cb623582d8ed100f… · /containers/cna/problemTypes/0/descriptions/1

Affected products and versions

5 source assertions
{"cpes":["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"],"defaultStatus":"unknown","modules":["pubkey_cert"],"packageName":"public_key","packageURL":"pkg:otp/public_key?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp&vcs_url=git%20https:%2F%2Fgithub.com%2Ferlang%2Fotp.git","product":"OTP","programFiles":["src/pubkey_cert.erl"],"programRoutines":[{"name":"pubkey_cert:validate_extensions/7"}],"repo":"https://github.com/erlang/otp","vendor":"Erlang","versions":[{"changes":[{"at":"1.15.1.7","status":"unaffected"},{"at":"1.17.1.3","status":"unaffected"},{"at":"1.20.3.1","status":"unaffected"}…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:3fc0879e57ee63d6a2e736449cc61f396da95a345bc3acc44b18609b9ea9b1cf · sha256:cb623582d8ed100f… · /containers/cna/affected/0
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:openstack:16.2"],"defaultStatus":"affected","packageName":"erlang","product":"Red Hat OpenStack Platform 16.2","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:3fc0879e57ee63d6a2e736449cc61f396da95a345bc3acc44b18609b9ea9b1cf · sha256:cb623582d8ed100f… · /containers/adp/1/affected/0
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:openstack:17.1"],"defaultStatus":"affected","packageName":"erlang","product":"Red Hat OpenStack Platform 17.1","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:3fc0879e57ee63d6a2e736449cc61f396da95a345bc3acc44b18609b9ea9b1cf · sha256:cb623582d8ed100f… · /containers/adp/1/affected/1
{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"],"defaultStatus":"unknown","modules":["pubkey_cert"],"packageName":"erlang/otp","packageURL":"pkg:github/erlang/otp","product":"OTP","programFiles":["lib/public_key/src/pubkey_cert.erl"],"programRoutines":[{"name":"pubkey_cert:validate_extensions/7"}],"repo":"https://github.com/erlang/otp","vendor":"Erlang","versions":[{"changes":[{"at":"26.2.5.21","status":"unaffected"},{"at":"27.3.4.12","status":"unaffected"},{"at":"28.5.0.1","status":"unaffected"},{"at":"29.0.1","status":"unaffected"}],"lessThan":"…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:3fc0879e57ee63d6a2e736449cc61f396da95a345bc3acc44b18609b9ea9b1cf · sha256:cb623582d8ed100f… · /containers/cna/affected/1
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:openstack:18.0"],"defaultStatus":"affected","packageName":"erlang","product":"Red Hat OpenStack Platform 18.0","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:3fc0879e57ee63d6a2e736449cc61f396da95a345bc3acc44b18609b9ea9b1cf · sha256:cb623582d8ed100f… · /containers/adp/1/affected/2

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":7,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:H/SI:H/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:3fc0879e57ee63d6a2e736449cc61f396da95a345bc3acc44b18609b9ea9b1cf · sha256:cb623582d8ed100f… · /containers/cna/metrics/0/cvssV4_0
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:3fc0879e57ee63d6a2e736449cc61f396da95a345bc3acc44b18609b9ea9b1cf · sha256:cb623582d8ed100f… · /containers/adp/1/metrics/1/cvssV3_1

CWE assertions

3 source assertions
{"cweId":"CWE-295","description":"CWE-295 Improper Certificate Validation","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:3fc0879e57ee63d6a2e736449cc61f396da95a345bc3acc44b18609b9ea9b1cf · sha256:cb623582d8ed100f… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-295","description":"Improper Certificate Validation","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:3fc0879e57ee63d6a2e736449cc61f396da95a345bc3acc44b18609b9ea9b1cf · sha256:cb623582d8ed100f… · /containers/adp/1/problemTypes/0/descriptions/0
{"cweId":"CWE-296","description":"CWE-296 Improper Following of a Certificate's Chain of Trust","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:3fc0879e57ee63d6a2e736449cc61f396da95a345bc3acc44b18609b9ea9b1cf · sha256:cb623582d8ed100f… · /containers/cna/problemTypes/0/descriptions/1

Source references

10 source assertions
{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:39809"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3fc0879e57ee63d6a2e736449cc61f396da95a345bc3acc44b18609b9ea9b1cf · sha256:cb623582d8ed100f… · /containers/adp/1/references/3
{"tags":["vdb-entry","x_refsource_REDHAT"],"url":"https://access.redhat.com/security/cve/CVE-2026-42789"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3fc0879e57ee63d6a2e736449cc61f396da95a345bc3acc44b18609b9ea9b1cf · sha256:cb623582d8ed100f… · /containers/adp/1/references/0
{"name":"RHBZ#2482093","tags":["issue-tracking","x_refsource_REDHAT"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2482093"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3fc0879e57ee63d6a2e736449cc61f396da95a345bc3acc44b18609b9ea9b1cf · sha256:cb623582d8ed100f… · /containers/adp/1/references/1
{"tags":["related"],"url":"https://cna.erlef.org/cves/CVE-2026-42789.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3fc0879e57ee63d6a2e736449cc61f396da95a345bc3acc44b18609b9ea9b1cf · sha256:cb623582d8ed100f… · /containers/cna/references/1
{"tags":["patch"],"url":"https://github.com/erlang/otp/commit/471cd2f664300a95353c467873800bbe706005db"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3fc0879e57ee63d6a2e736449cc61f396da95a345bc3acc44b18609b9ea9b1cf · sha256:cb623582d8ed100f… · /containers/cna/references/4
{"tags":["patch"],"url":"https://github.com/erlang/otp/commit/59c8d824386b2eb1614ff9340624843ef6aca0fd"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3fc0879e57ee63d6a2e736449cc61f396da95a345bc3acc44b18609b9ea9b1cf · sha256:cb623582d8ed100f… · /containers/cna/references/5
{"tags":["vendor-advisory","related"],"url":"https://github.com/erlang/otp/security/advisories/GHSA-c99q-jmpx-v8qq"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3fc0879e57ee63d6a2e736449cc61f396da95a345bc3acc44b18609b9ea9b1cf · sha256:cb623582d8ed100f… · /containers/cna/references/0
{"tags":["related"],"url":"https://osv.dev/vulnerability/EEF-CVE-2026-42789"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3fc0879e57ee63d6a2e736449cc61f396da95a345bc3acc44b18609b9ea9b1cf · sha256:cb623582d8ed100f… · /containers/cna/references/2
{"tags":["x_sadp-csaf-vex"],"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42789.json"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3fc0879e57ee63d6a2e736449cc61f396da95a345bc3acc44b18609b9ea9b1cf · sha256:cb623582d8ed100f… · /containers/adp/1/references/2
{"tags":["x_version-scheme"],"url":"https://www.erlang.org/doc/system/versions.html#order-of-versions"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3fc0879e57ee63d6a2e736449cc61f396da95a345bc3acc44b18609b9ea9b1cf · sha256:cb623582d8ed100f… · /containers/cna/references/3

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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