Heap-based buffer overflow in the ALGnew function in block_templace.c in Python Cryptography Toolkit (aka pycrypto) allows remote attackers to execute arbitrary code as demonstrated by a crafted iv parameter to cryptmsg.py.
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Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2018-12-14. NVD baseline CVSS 9.8; sources differ by 0.0.
Heap-based buffer overflow in the ALGnew function in block_templace.c in Python Cryptography Toolkit (aka pycrypto) allows remote attackers to execute arbitrary code as demonstrated by a crafted iv parameter to cryptmsg.py.
February 15, 2017
May 13, 2026
| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| ubuntu | python3-crypto (2.6.1-6ubuntu0.16.04.2) @ xenial | 2026-05-20 | ubuntu |
| ubuntu | python3-crypto (2.6.1-4ubuntu0.1) @ trusty | 2026-05-20 | ubuntu |
| ubuntu | python-crypto (2.4.1-1ubuntu0.2) @ precise | 2026-05-20 | ubuntu |
| pip | pycrypto | — | ghsa |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| pycrypto | 1.9a2 ... 2.6.1 (13 versions) | 8dbe0dc3eea5c689d4f76b37b93fe216cf1f00d4 | — |
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