CVE-2026-75803 Details
Issue summary: ChaCha20-Poly1305 and AES-OCB decryption with an empty
ciphertext can report success without verifying the supplied authentication
tag when the operation is finalized by calling the EVP_Cipher() function.

Impact summary: Applications calling EVP_Cipher() on an empty ciphertext and
expecting the call to check the AEAD tag may accept forged messages.

CWE: CWE-354 (Improper Validation of Integrity Check Value)

Description: The EVP_Cipher() API call for AEAD ciphers behaves like a one
shot encryption and decryption call. It also verifies the AEAD tag after the
decryption operation. However for AES-OCB and ChaCha20-Poly1305 ciphers
it skipped the AEAD tag verification when an empty ciphertext was passed to
the function. The callers of this function might believe that a successful
return indicates a valid AEAD tag for these ciphers, even when that has not
truly been validated in this case.

FIPS impact: no
The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this CVE
as the affected algorithms are not FIPS approved and thus not implemented
in the FIPS module.
View at NVD
Exploit prediction scoring system (EPSS) score for CVE-2026-75803
EPSS (Exploit Prediction Scoring System): EPSS predicts the likelihood that a vulnerability will be exploited in the wild. A higher percentage means a greater chance of an exploit occurring. The EPSS model produces a probability score between 0 and 1 (0 and 100%).
0.22 Probability of exploitation activity being observed over the next 30 days (13th percentile)
CVSS score for CVE-2026-75803
CVSS (Common Vulnerability Scoring System): An open framework owned and managed by FIRST.Org, Inc. that assigns a numerical score from 0 to 10 to software vulnerabilities to indicate their severity.
9.1 Critical
Products affected by CVE-2026-75803
OpenSSL 3.4.0
OpenSSL 3.4.1
OpenSSL 3.5.0
OpenSSL 3.6.2
OpenSSL 3.5.1
DVE Score by Bitsight AI
DVE scores complement traditional static scoring systems like CVSS with Bitsight AI powered real-time threat intelligence and underground cyber criminal activity so that security teams can reduce alert fatigue and focus on vulnerabilities most likely to be exploited.
Low
More on DVE scores

CVE-2026-75803 Global Footprint

Top 10 Identified Countries

Country Observations Percentage
US 9,125 36.43%
DE 2,587 10.33%
JP 2,294 9.16%
NL 1,302 5.20%
GB 835 3.33%
FR 799 3.19%
CA 673 2.69%
DK 622 2.48%
IN 527 2.10%
IE 506 2.02%

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CVE-2026-75803 Industry Footprint

Top 10 Identified Industries

*Service provider organizations (typically Technology and Telecommunications) are disproportionally represented in the results given their upstream ownership of end-user infrastructure. See our FAQs.

Industry* Observations Percentage
Technology 13,711 76.60%
Telecommunications 2,303 12.87%
Education 1,028 5.74%
Government/Politics 225 1.26%
Energy/Resources 137 0.77%
Business Services 93 0.52%
Utilities 59 0.33%
Manufacturing 55 0.31%
Media/Entertainment 51 0.28%
Finance 50 0.28%

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