VulnSocial

CVE-2026-6550Disclosure

LOWCVSS 5.7 · MEDIUM

Exploitation ongoing with high activity in latest observed window (1 mentions)

Immediate actions

  • Prioritize remediation for affected systems immediately
  • Assume compromise if assets are exposed
  • Track advisory updates for patch or workaround availability

Recommended action window: Immediate (within 24h)

NVD description

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.

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3.5/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-757

Priority

LOW

Exploitation

ACTIVE

PoC

NONE

Patch

NONE

Momentum

STABLE

Threat summary

  • Active exploitation appears in 1 classified signals
  • 4 mentions across 3 observed days
  • Momentum state: stable

What's happening

  • Active exploitation reported across 1 signal
  • Technical details provided in 3 signals
  • Disclosure: 3 classified signals
  • Peaked 2d ago at 2 mentions (2026-04-21); latest day: 1
  • 4 total mentions across 3 days

Deep dive

Activity timeline4 mentions / 3d
01122Mentions · 2026-04-21: 2Mentions · 2026-04-23: 1Mentions · 2026-04-24: 1Active Exploitation · 2026-04-21: 1Technical Details · 2026-04-21: 1Technical Details · 2026-04-23: 1Technical Details · 2026-04-24: 104-2104-2304-24
Signal classification2 categories
Disclosure
375.0%
Active Exploitation
125.0%
Referenced assets4 URLs
Classification over time
DateTotalLabels
2026-04-212
Active Exploitation1Disclosure1
2026-04-231
Disclosure1
2026-04-241
Disclosure1
Full discourse4 posts
  • VulDB 🛡@vuldb
    Active Exploitation

    A lot of offensive activities were identified targeting Amazon AWS Encryption SDK for Python (CVE-2026-6550) https://vuldb.com/vuln/358351/cti

    Post summary

    The statement indicates that multiple offensive operations have been detected against Amazon AWS Encryption SDK for Python (CVE-2026‑6550), evidencing active exploitation in the field.

    0101074
    2.1K followersView on X
  • Eyal Estrin ☁️@eyalestrin
    Disclosure

    CVE-2026-6550 - Key commitment policy bypass via shared key cache in AWS Encryption SDK for Python http://dlvr.it/TSBh69 #patchmanagement

    Post summary

    The statement discloses CVE-2026-6550, detailing a key commitment policy bypass in AWS Encryption SDK for Python through shared key cache, without mentioning PoC, exploitation, patches, or false positives.

    0000147
    2.0K followersView on X
  • DailyCVE@dailycve
    Disclosure

    🟠 #AWS Encryption SDK for #Python, Algorithm Downgrade via Shared Key Cache, #CVE-2026-6550 (medium) https://dailycve.com/aws-encryption-sdk-for-python-algorithm-downgrade-via-shared-key-cache-cve-2026-6550-medium/

    Post summary

    The tweet announces CVE‑2026‑6550, a medium‑severity algorithm downgrade flaw in AWS Encryption SDK for Python, but offers no PoC, exploit, or patch information.

    0000022
    183 followersView on X
  • CVE@CVEnew
    Disclosure

    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 authenticat… https://www.cve.org/CVERecord?id=CVE-2026-6550

    Post summary

    The tweet announces CVE-2026-6550, outlining a cryptographic downgrade vulnerability in AWS Encryption SDK for Python versions before 3.3.1 and 4.0.5, but provides no PoC, exploit details, or patch information.

    00000114
    57.2K followersView on X

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