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Vulnerability Details :

CVE-2026-5479

Summary
Assigner-wolfSSL
Assigner Org ID-50d2cd11-d01a-48ed-9441-5bfce9d63b27
Published At-10 Apr, 2026 | 02:38
Updated At-22 Apr, 2026 | 03:55
Rejected At-
Credits

wolfSSL EVP ChaCha20-Poly1305 AEAD authentication tag

In wolfSSL's EVP layer, the ChaCha20-Poly1305 AEAD decryption path in wolfSSL_EVP_CipherFinal (and related EVP cipher finalization functions) fails to verify the authentication tag before returning plaintext to the caller. When an application uses the EVP API to perform ChaCha20-Poly1305 decryption, the implementation computes or accepts the tag but does not compare it against the expected value.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:wolfSSL
Assigner Org ID:50d2cd11-d01a-48ed-9441-5bfce9d63b27
Published At:10 Apr, 2026 | 02:38
Updated At:22 Apr, 2026 | 03:55
Rejected At:
▼CVE Numbering Authority (CNA)
wolfSSL EVP ChaCha20-Poly1305 AEAD authentication tag

In wolfSSL's EVP layer, the ChaCha20-Poly1305 AEAD decryption path in wolfSSL_EVP_CipherFinal (and related EVP cipher finalization functions) fails to verify the authentication tag before returning plaintext to the caller. When an application uses the EVP API to perform ChaCha20-Poly1305 decryption, the implementation computes or accepts the tag but does not compare it against the expected value.

Affected Products
Vendor
wolfSSL
Product
wolfSSL
Repo
https://github.com/wolfSSL/wolfssl
Program Files
  • wolfcrypt/src/evp.c
Default Status
unaffected
Versions
Affected
  • From 0 before 5.9.1 (semver)
Problem Types
TypeCWE IDDescription
CWECWE-354CWE-354 Improper Validation of Integrity Check Value
Type: CWE
CWE ID: CWE-354
Description: CWE-354 Improper Validation of Integrity Check Value
Metrics
VersionBase scoreBase severityVector
4.07.6HIGH
CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Version: 4.0
Base score: 7.6
Base severity: HIGH
Vector:
CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
finder
Calif.io in collaboration with Claude and Anthropic Research
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/wolfSSL/wolfssl/pull/10102
N/A
Hyperlink: https://github.com/wolfSSL/wolfssl/pull/10102
Resource: N/A
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:facts@wolfssl.com
Published At:10 Apr, 2026 | 04:17
Updated At:29 Apr, 2026 | 13:45

In wolfSSL's EVP layer, the ChaCha20-Poly1305 AEAD decryption path in wolfSSL_EVP_CipherFinal (and related EVP cipher finalization functions) fails to verify the authentication tag before returning plaintext to the caller. When an application uses the EVP API to perform ChaCha20-Poly1305 decryption, the implementation computes or accepts the tag but does not compare it against the expected value.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.07.6HIGH
CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/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
Primary3.18.1HIGH
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Type: Secondary
Version: 4.0
Base score: 7.6
Base severity: HIGH
Vector:
CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/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
Type: Primary
Version: 3.1
Base score: 8.1
Base severity: HIGH
Vector:
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CPE Matches
wolfssl
wolfssl
>>wolfssl>>Versions before 5.9.1(exclusive)
cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-354Secondaryfacts@wolfssl.com
CWE ID: CWE-354
Type: Secondary
Source: facts@wolfssl.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/wolfSSL/wolfssl/pull/10102facts@wolfssl.com
Issue Tracking
Hyperlink: https://github.com/wolfSSL/wolfssl/pull/10102
Source: facts@wolfssl.com
Resource:
Issue Tracking

Change History

0
Information is not available yet

Similar CVEs

2Records found
CVE-2026-5466
Matching Score-8
Assigner-wolfSSL Inc.
ShareView Details
Matching Score-8
Assigner-wolfSSL Inc.
CVSS Score-7.6||HIGH
EPSS-0.01% / 1.17%
||
7 Day CHG~0.00%
Published-10 Apr, 2026 | 03:00
Updated-29 Apr, 2026 | 13:49
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
wc_VerifyEccsiHash missing sanity check

wolfSSL's ECCSI signature verifier `wc_VerifyEccsiHash` decodes the `r` and `s` scalars from the signature blob via `mp_read_unsigned_bin` with no check that they lie in `[1, q-1]`. A crafted forged signature could verify against any message for any identity, using only publicly-known constants.

Action-Not Available
Vendor-wolfsslwolfSSL
Product-wolfsslwolfSSL
CWE ID-CWE-347
Improper Verification of Cryptographic Signature
CVE-2026-5504
Matching Score-6
Assigner-wolfSSL Inc.
ShareView Details
Matching Score-6
Assigner-wolfSSL Inc.
CVSS Score-6.3||MEDIUM
EPSS-0.02% / 5.01%
||
7 Day CHG~0.00%
Published-09 Apr, 2026 | 22:33
Updated-29 Apr, 2026 | 14:06
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
PKCS7 CBC Padding Oracle — Plaintext Recovery

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.

Action-Not Available
Vendor-wolfsslwolfSSL
Product-wolfsslwolfSSL
CWE ID-CWE-354
Improper Validation of Integrity Check Value
Details not found