VulnSocial

CVE-2026-6291Disclosure(wolfssl / wolfssl)

LOWCVSS 6.5 · MEDIUM

Signal is active with 2 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

Bleichenbacher padding oracle in PKCS#7 KTRI decryption. When decrypting PKCS#7 EnvelopedData using RSA PKCS#1 v1.5 key transport, wolfSSL returned distinguishable error codes depending on whether RSA padding validation failed versus whether the decrypted content was malformed. An attacker able to submit crafted EnvelopedData messages and observe error responses could use this as a padding oracle to incrementally recover the encrypted Content Encryption Key (CEK). The fix generates a deterministic pseudo-random fake CEK on padding failure (via HMAC-SHA256) and proceeds with decryption identically, using constant-time operations throughout, so that all failure paths produce the same error regardless of padding validity.

wolfssl CVEsBack to dashboard
0.0/ 10 priority

Sources & remediation

Vendor / third-party advisories
Other references
Weakness type (CWE)
CWE-208

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • wolfssl

Threat summary

  • 2 mentions across 1 observed day

What's happening

  • Technical details provided in 2 signals
  • Disclosure: 2 classified signals
  • 2 total mentions across 1 day

Affected systems

Vendors
wolfssl
Products
wolfssl

Deep dive

Activity timeline2 mentions / 1d
01122Mentions · 2026-06-25: 2Technical Details · 2026-06-25: 206-25
Signal classification1 categories
Disclosure
2100.0%
Referenced assets2 URLs
By indicator
Full discourse2 posts
  • Infoflowcloud@infoflowcloud
    Disclosure

    🚨*CVE* CVE-2026-6291 Bleichenbacher padding oracle in PKCS#7 KTRI decryption. When decrypting PKCS#7 EnvelopedData using RSA PKCS#1 v1.5 key transport, wolfSSL returned distinguishable erro… https://www.cve.org/CVERecord?id=CVE-2026-6291 ----- Traducción: CVE-2026-6291 Óra… http://infoflow.cloud`

    Post summary

    The post announces CVE-2026-6291, providing technical details about a Bleichenbacher padding oracle vulnerability, but does not include PoC, exploit, or patch information.

    0000047
    89 followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-6291 Bleichenbacher padding oracle in PKCS#7 KTRI decryption. When decrypting PKCS#7 EnvelopedData using RSA PKCS#1 v1.5 key transport, wolfSSL returned distinguishable erro… https://www.cve.org/CVERecord?id=CVE-2026-6291

    Post summary

    The post announces a new Bleichenbacher padding oracle (CVE-2026-6291) affecting wolfSSL’s PKCS#7 KTRI decryption with detailed technical context, but no patch, exploit, or evidence of active use.

    00000721
    57.7K followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Appwolfsslwolfssl---

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