CVE-2026-42327Disclosure

LOWCVSS 8.7 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

rust-openssl provides OpenSSL bindings for the Rust programming language. From 0.9.7 to before 0.10.79, X509Ref::ocsp_responders returns OCSP responder URLs from a certificate's AIA extension as OpensslString, whose Deref<Target = str> wraps the raw bytes with str::from_utf8_unchecked. OpenSSL does not enforce that the underlying IA5String is ASCII, so a certificate with non-UTF-8 bytes in its OCSP accessLocation causes safe Rust code to construct a &str that violates the UTF-8 invariant — resulting in undefined behavior. This vulnerability is fixed in 0.10.79.

0.0/ 10 priority

Sources & remediation

Weakness type (CWE)
CWE-20

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

STABLE

Threat summary

  • 2 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Technical details provided in 2 signals
  • Disclosure: 2 classified signals
  • Peaked 1d ago at 1 mentions (2026-05-14); latest day: 1
  • 2 total mentions across 2 days

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-05-14: 1Mentions · 2026-05-15: 1Technical Details · 2026-05-14: 1Technical Details · 2026-05-15: 105-1405-15
Signal classification1 categories
Disclosure
2100.0%
Referenced assets2 URLs
Full discourse2 posts
  • CVE@CVEnew
    Disclosure

    CVE-2026-42327 rust-openssl provides OpenSSL bindings for the Rust programming language. From 0.9.7 to before 0.10.79, X509Ref::ocsp_responders returns OCSP responder URLs from a ce… https://www.cve.org/CVERecord?id=CVE-2026-42327

    Post summary

    The passage announces CVE‑2026‑42327 in rust‑openssl, detailing the vulnerable function and affected versions, but provides no evidence of exploitation, patching, or PoC.

    00010171
    57.5K followersView on X
  • Vulmon Vulnerability Feed@VulmonFeeds
    Disclosure

    CVE-2026-42327 UTF-8 Invariant Violation in rust-openssl X509Ref OCSP Responders Parsing https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-42327

    Post summary

    The text announces CVE‑2026‑42327, a UTF‑8 invariant violation in rust‑openssl’s OCSP responder parsing logic, without providing PoC, exploit code, or remediation details.

    0000053
    4.0K followersView on X

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