CVE-2026-6678: Integer underflow in wc_PKCS7_DecryptOri when handling crafted Other Recipient Info, leading to incorrect length handling during decryption.
Integer underflow in wc_PKCS7_DecryptOri when handling crafted Other Recipient Info, leading to incorrect length handling during decryption.
Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-6678
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-66780.19% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 9% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-6678 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
Recent advisories for Integer underflow in
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- highCVE-2026-29008: U-Boot through 2026.04-rc3 contains an integer underflow vulnerability in the tcp_rx_state_mac…nvd · 2026-07-08
- mediumCVE-2026-55490: OpenWrt is a Linux operating system targeting embedded devices. Before v25.12.5, an integer un…nvd · 2026-07-07
- highCVE-2026-57918: libnfs through 6.0.2 before 935b8db has an xid integer underflow in READ_IOVEC in rpc_read_fro…nvd · 2026-06-26
- mediumCVE-2026-6678: Integer underflow in wc_PKCS7_DecryptOri handling crafted Other Recipient Infomsrc · 2026-06-09
- mediumCVE-2026-58058: Nmap - Integer Underflow in IPv6 Extension Header Parsingmsrc · 2026-06-09
- highCVE-2026-57918: libnfs through 6.0.2 before 935b8db has an xid integer underflow in READ_IOVEC in rpc_read_fro…msrc · 2026-06-09
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