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CVE-2026-6550

Cryptographic algorithm downgrade in the caching layer of Amazon AWS Encryption SDK for Python before version 3.3.1 and before version 4.0.5 might allow an authenticated local threat actor to bypass key commitment policy enforcement via a shared key cache, resulting in ciphertext that can be decrypted to multiple different plaintexts. To remediate this issue, users should upgrade to version 3.3.1, 4.0.5 or above.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:b33cef9497bfc7f8fa59bdf1ae367b3830ac04db6081b87c3b166aa0f73970d8
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"attackComplexity":"HIGH","attackVector":"LOCAL","availabilityImpact":"NONE","baseScore":4.7,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:d210bb178cc0241a2146367f63f6385cbe2f14e754748c8b8ddf8c9fcfb18ac9 · sha256:9879db8681b895c0… · /containers/cna/metrics/0/cvssV3_1

{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"HIGH","attackRequirements":"PRESENT","attackVector":"LOCAL","baseScore":5.7,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"LOW","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:d210bb178cc0241a2146367f63f6385cbe2f14e754748c8b8ddf8c9fcfb18ac9 · sha256:9879db8681b895c0… · /containers/cna/metrics/1/cvssV4_0

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","product":"AWS Encryption SDK for Python","vendor":"AWS","versions":[{"lessThanOrEqual":"2.5.1","status":"affected","version":"2","versionType":"custom"},{"lessThanOrEqual":"3.3.0","status":"affected","version":"3","versionType":"custom"},{"lessThanOrEqual":"4.0.4","status":"affected","version":"4","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:d210bb178cc0241a2146367f63f6385cbe2f14e754748c8b8ddf8c9fcfb18ac9 · sha256:9879db8681b895c0… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"HIGH","attackVector":"LOCAL","availabilityImpact":"NONE","baseScore":4.7,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:d210bb178cc0241a2146367f63f6385cbe2f14e754748c8b8ddf8c9fcfb18ac9 · sha256:9879db8681b895c0… · /containers/cna/metrics/0/cvssV3_1
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"HIGH","attackRequirements":"PRESENT","attackVector":"LOCAL","baseScore":5.7,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"LOW","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:d210bb178cc0241a2146367f63f6385cbe2f14e754748c8b8ddf8c9fcfb18ac9 · sha256:9879db8681b895c0… · /containers/cna/metrics/1/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-757","description":"CWE-757 Selection of Less-Secure algorithm during negotiation ('algorithm downgrade')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:d210bb178cc0241a2146367f63f6385cbe2f14e754748c8b8ddf8c9fcfb18ac9 · sha256:9879db8681b895c0… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"tags":["vendor-advisory"],"url":"https://aws.amazon.com/security/security-bulletins/2026-017-aws/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d210bb178cc0241a2146367f63f6385cbe2f14e754748c8b8ddf8c9fcfb18ac9 · sha256:9879db8681b895c0… · /containers/cna/references/0
{"tags":["patch"],"url":"https://github.com/aws/aws-encryption-sdk-python/releases/tag/v3.3.1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d210bb178cc0241a2146367f63f6385cbe2f14e754748c8b8ddf8c9fcfb18ac9 · sha256:9879db8681b895c0… · /containers/cna/references/2
{"tags":["patch"],"url":"https://github.com/aws/aws-encryption-sdk-python/releases/tag/v4.0.5"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d210bb178cc0241a2146367f63f6385cbe2f14e754748c8b8ddf8c9fcfb18ac9 · sha256:9879db8681b895c0… · /containers/cna/references/1
{"tags":["third-party-advisory"],"url":"https://github.com/aws/aws-encryption-sdk-python/security/advisories/GHSA-v638-38fc-rhfv"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d210bb178cc0241a2146367f63f6385cbe2f14e754748c8b8ddf8c9fcfb18ac9 · sha256:9879db8681b895c0… · /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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