CVE-2026-110310
A remote user who can read encrypted objects in the S3 bucket can force a padding downgrade by…
- Risk score
- 40/100
- CVSS
- 5.3 v3.1
- Exploit chance (30 days)
- 0.5%
- Published
- 14 Oct 2026
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What to know
- What it is
- A remote user who can read encrypted objects in the S3 bucket can force a padding downgrade by altering the padding scheme recorded in an object's metadata to legacy PKCS#1 v1.5. Since this padding scheme is susceptible to the well-known Bleichenbacher attack, the user can use a PKCS#1 v1.5 padding oracle to recover t…
- Affected
- See advisory
- Fix
- Upgrade the product to 3.2.2 or 4.0.3 (whichever matches your release line), or later.
- Exploitation
- No known exploitation
Why it is Yellow
- CVSS 5.3 medium
References
Original description
A remote user who can read encrypted objects in the S3 bucket can force a padding downgrade by altering the padding scheme recorded in an object's metadata to legacy PKCS#1 v1.5. Since this padding scheme is susceptible to the well-known Bleichenbacher attack, the user can use a PKCS#1 v1.5 padding oracle to recover the RSA-wrapped envelope key and decrypt the object. To remediate this issue, we recommend that users upgrade to version 3.2.2 or 4.0.3. The 1.x and 2.x lines will not be patched, users of those lines need to migrate to 3.2.2 or 4.0.3.
Last activity 14 Oct 2026. Patch Forecast updates every hour.