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CVE-2026-55653

A flaw was found in OpenSSH. A malicious SSH server can exploit a double free vulnerability in the Diffie-Hellman Group Exchange (DH-GEX) client path. This occurs during FIPS (Federal Information Processing Standards) mode known-group validation when the client processes attacker-controlled DH-GEX group parameters. Successful exploitation leads to client-side process termination, resulting in a Denial of Service (DoS).
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:3e57b07008790c6d9fbd27412fb5349dd5ce5c88b2c7e4121b38d8116dac94c9
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 9 assertions

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:enterprise_linux:8::appstream","cpe:/o:redhat:enterprise_linux:8::baseos"],"defaultStatus":"affected","packageName":"openssh","product":"Red Hat Enterprise Linux 8","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"0:8.0p1-30.el8_10","versionType":"rpm"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8216c5e7d2325dd342d156304fb930476f8c47439d465cc7bc94d845252c05c8 · sha256:f2bc849d1756489c… · /containers/cna/affected/1

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:7"],"defaultStatus":"affected","packageName":"openssh","product":"Red Hat Enterprise Linux 7","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8216c5e7d2325dd342d156304fb930476f8c47439d465cc7bc94d845252c05c8 · sha256:f2bc849d1756489c… · /containers/cna/affected/7

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:6"],"defaultStatus":"affected","packageName":"openssh","product":"Red Hat Enterprise Linux 6","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8216c5e7d2325dd342d156304fb930476f8c47439d465cc7bc94d845252c05c8 · sha256:f2bc849d1756489c… · /containers/cna/affected/6

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:10.2"],"defaultStatus":"affected","packageName":"openssh","product":"Red Hat Enterprise Linux 10","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"0:9.9p1-25.el10_2","versionType":"rpm"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8216c5e7d2325dd342d156304fb930476f8c47439d465cc7bc94d845252c05c8 · sha256:f2bc849d1756489c… · /containers/cna/affected/0

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:enterprise_linux:9::appstream","cpe:/o:redhat:enterprise_linux:9::baseos"],"defaultStatus":"affected","packageName":"openssh","product":"Red Hat Enterprise Linux 9","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"0:9.9p1-9.el9_8","versionType":"rpm"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8216c5e7d2325dd342d156304fb930476f8c47439d465cc7bc94d845252c05c8 · sha256:f2bc849d1756489c… · /containers/cna/affected/4

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:openshift:4"],"defaultStatus":"affected","packageName":"rhcos","product":"Red Hat OpenShift Container Platform 4","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8216c5e7d2325dd342d156304fb930476f8c47439d465cc7bc94d845252c05c8 · sha256:f2bc849d1756489c… · /containers/cna/affected/8

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:enterprise_linux:8::appstream","cpe:/o:redhat:enterprise_linux:8::baseos"],"defaultStatus":"affected","packageName":"openssh","product":"Red Hat Enterprise Linux 8","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"0:8.0p1-30.el8_10","versionType":"rpm"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8216c5e7d2325dd342d156304fb930476f8c47439d465cc7bc94d845252c05c8 · sha256:f2bc849d1756489c… · /containers/cna/affected/2

{"collectionURL":"https://catalog.redhat.com/software/containers/","cpes":["cpe:/a:redhat:hummingbird:1"],"defaultStatus":"affected","packageName":"openssh-main","product":"Red Hat Hardened Images","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"10.3p1-6.hum1","versionType":"rpm"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8216c5e7d2325dd342d156304fb930476f8c47439d465cc7bc94d845252c05c8 · sha256:f2bc849d1756489c… · /containers/cna/affected/5

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:enterprise_linux:9::appstream","cpe:/o:redhat:enterprise_linux:9::baseos"],"defaultStatus":"affected","packageName":"openssh","product":"Red Hat Enterprise Linux 9","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"0:9.9p1-9.el9_8","versionType":"rpm"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8216c5e7d2325dd342d156304fb930476f8c47439d465cc7bc94d845252c05c8 · sha256:f2bc849d1756489c… · /containers/cna/affected/3

Affected products and versions

9 source assertions
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:enterprise_linux:8::appstream","cpe:/o:redhat:enterprise_linux:8::baseos"],"defaultStatus":"affected","packageName":"openssh","product":"Red Hat Enterprise Linux 8","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"0:8.0p1-30.el8_10","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8216c5e7d2325dd342d156304fb930476f8c47439d465cc7bc94d845252c05c8 · sha256:f2bc849d1756489c… · /containers/cna/affected/1
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:7"],"defaultStatus":"affected","packageName":"openssh","product":"Red Hat Enterprise Linux 7","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8216c5e7d2325dd342d156304fb930476f8c47439d465cc7bc94d845252c05c8 · sha256:f2bc849d1756489c… · /containers/cna/affected/7
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:6"],"defaultStatus":"affected","packageName":"openssh","product":"Red Hat Enterprise Linux 6","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8216c5e7d2325dd342d156304fb930476f8c47439d465cc7bc94d845252c05c8 · sha256:f2bc849d1756489c… · /containers/cna/affected/6
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:10.2"],"defaultStatus":"affected","packageName":"openssh","product":"Red Hat Enterprise Linux 10","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"0:9.9p1-25.el10_2","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8216c5e7d2325dd342d156304fb930476f8c47439d465cc7bc94d845252c05c8 · sha256:f2bc849d1756489c… · /containers/cna/affected/0
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:enterprise_linux:9::appstream","cpe:/o:redhat:enterprise_linux:9::baseos"],"defaultStatus":"affected","packageName":"openssh","product":"Red Hat Enterprise Linux 9","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"0:9.9p1-9.el9_8","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8216c5e7d2325dd342d156304fb930476f8c47439d465cc7bc94d845252c05c8 · sha256:f2bc849d1756489c… · /containers/cna/affected/4
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:openshift:4"],"defaultStatus":"affected","packageName":"rhcos","product":"Red Hat OpenShift Container Platform 4","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8216c5e7d2325dd342d156304fb930476f8c47439d465cc7bc94d845252c05c8 · sha256:f2bc849d1756489c… · /containers/cna/affected/8
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:enterprise_linux:8::appstream","cpe:/o:redhat:enterprise_linux:8::baseos"],"defaultStatus":"affected","packageName":"openssh","product":"Red Hat Enterprise Linux 8","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"0:8.0p1-30.el8_10","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8216c5e7d2325dd342d156304fb930476f8c47439d465cc7bc94d845252c05c8 · sha256:f2bc849d1756489c… · /containers/cna/affected/2
{"collectionURL":"https://catalog.redhat.com/software/containers/","cpes":["cpe:/a:redhat:hummingbird:1"],"defaultStatus":"affected","packageName":"openssh-main","product":"Red Hat Hardened Images","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"10.3p1-6.hum1","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8216c5e7d2325dd342d156304fb930476f8c47439d465cc7bc94d845252c05c8 · sha256:f2bc849d1756489c… · /containers/cna/affected/5
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:enterprise_linux:9::appstream","cpe:/o:redhat:enterprise_linux:9::baseos"],"defaultStatus":"affected","packageName":"openssh","product":"Red Hat Enterprise Linux 9","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"0:9.9p1-9.el9_8","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8216c5e7d2325dd342d156304fb930476f8c47439d465cc7bc94d845252c05c8 · sha256:f2bc849d1756489c… · /containers/cna/affected/3

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":4.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:8216c5e7d2325dd342d156304fb930476f8c47439d465cc7bc94d845252c05c8 · sha256:f2bc849d1756489c… · /containers/cna/metrics/1/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-415","description":"Double Free","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8216c5e7d2325dd342d156304fb930476f8c47439d465cc7bc94d845252c05c8 · sha256:f2bc849d1756489c… · /containers/cna/problemTypes/0/descriptions/0

Source references

6 source assertions
{"name":"RHSA-2026:36759","tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:36759"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8216c5e7d2325dd342d156304fb930476f8c47439d465cc7bc94d845252c05c8 · sha256:f2bc849d1756489c… · /containers/cna/references/0
{"name":"RHSA-2026:47755","tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:47755"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8216c5e7d2325dd342d156304fb930476f8c47439d465cc7bc94d845252c05c8 · sha256:f2bc849d1756489c… · /containers/cna/references/1
{"name":"RHSA-2026:47756","tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:47756"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8216c5e7d2325dd342d156304fb930476f8c47439d465cc7bc94d845252c05c8 · sha256:f2bc849d1756489c… · /containers/cna/references/2
{"name":"RHSA-2026:47757","tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:47757"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8216c5e7d2325dd342d156304fb930476f8c47439d465cc7bc94d845252c05c8 · sha256:f2bc849d1756489c… · /containers/cna/references/3
{"tags":["vdb-entry","x_refsource_REDHAT"],"url":"https://access.redhat.com/security/cve/CVE-2026-55653"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8216c5e7d2325dd342d156304fb930476f8c47439d465cc7bc94d845252c05c8 · sha256:f2bc849d1756489c… · /containers/cna/references/4
{"name":"RHBZ#2462351","tags":["issue-tracking","x_refsource_REDHAT"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2462351"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8216c5e7d2325dd342d156304fb930476f8c47439d465cc7bc94d845252c05c8 · sha256:f2bc849d1756489c… · /containers/cna/references/5

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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