Bug 2376425 (CVE-2025-52497)

Summary: CVE-2025-52497 mbedtls: Mbed TLS PEM Parsing Buffer Underflow
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in mbedtls. The `mbedtls_pem_read_buffer` and two `mbedtls_pk_parse` functions exhibit a one-byte heap-based buffer underflow when parsing untrusted PEM input. This flaw allows a network-based attacker to trigger the underflow by providing a maliciously crafted PEM file, resulting in a denial of service.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On: 2376691, 2376701, 2376690, 2376692, 2376693, 2376695, 2376696, 2376698, 2376699, 2376700, 2376702, 2382561    
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Description OSIDB Bzimport 2025-07-04 15:01:22 UTC 
Mbed TLS before 3.6.4 has a PEM parsing one-byte heap-based buffer underflow, in mbedtls_pem_read_buffer and two mbedtls_pk_parse functions, via untrusted PEM input.