CVE-2026-3548

Summary

Two buffer overflow vulnerabilities existed in the wolfSSL CRL parser when parsing CRL numbers: a heap-based buffer overflow could occur when improperly storing the CRL number as a hexadecimal string, and a stack-based overflow for sufficiently sized CRL numbers. With appropriately crafted CRLs, either of these out of bound writes could be triggered. Note this only affects builds that specifically enable CRL support, and the user would need to load a CRL from an untrusted source.

Affected Software

Weaknesses

• CWE-787: CWE-787 Out-of-bounds Write
• CWE-122: CWE-122 Heap-based Buffer Overflow

Workarounds

Disabling CRL processing is the only effective workaround for this issue. Preventing the overflow by validating the CRL number length requires source code modification and therefore should be considered a fix rather than a workaround.

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: total

References

• https://github.com/wolfSSL/wolfssl/pull/9628/
• https://github.com/wolfSSL/wolfssl/pull/9873/

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