HOMEVULNERABILITIESCVE-2026-5504
MEDIUMPOC

CVE-2026-5504

CWE-354Published: April 9, 2026· Updated: Apr 13, 2026

6.3
CVSS v3.1
EPSS:0.02%probability of exploitation in 30 daysPercentile:5.1th

Official Description

A padding oracle exists in wolfSSL's PKCS7 CBC decryption that could allow an attacker to recover plaintext through repeated decryption queries with modified ciphertext. In previous versions of wolfSSL the interior padding bytes are not validated.

NVD Source

Technical Analysis

CVE-2026-5504 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A proof-of-concept (PoC) exploit exists for CVE-2026-5504. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityHigh
Privileges Req.None
User InteractionNone
ScopeX
Impact
Confidentiality
Integrity
Availability
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected Vendors & Products

Mentioned vendors (from description):
Oracle
CPE data not yet available in NVD for this CVE.

Exploit & PoC Resources

POC AVAILABLEProof-of-concept code exists
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

All References (1)

→
https://github.com/wolfSSL/wolfssl/pull/10088

Quick Facts

CVE IDCVE-2026-5504
CVSS Score6.3 / 10
SeverityMEDIUM
WeaknessCWE-354
CISA KEVNo
ExploitPOC
EPSS (30d)0.02%
PublishedApr 9, 2026

Related CVEs (CWE-354)

CVE-2026-32105
9.3
CVE-2026-34182
9.1
CVE-2026-49230
9.1
CVE-2026-26928
8.7
CVE-2025-11694
8.7
CVE-2026-32600
8.2

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-5504 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
← All Vulnerabilities·Search for CVE-2026-5504·NVD