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🛡️ RUSTSEC-2026-0071 — hpke-rs

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Nonce Reuse in HPKE Context

The sequence number that is used to compute the AEAD nonce when using

a re-usable HPKE context is incremented after each seal or open

operation. This sequence number was stored as a u32 and used regular

addition on u32 for the increment, meaning in release mode it would

silently wrap around to 0 after 2^32 seal or open operations.

Impact

Nonce reuse causes catastrophic breakage of AEAD ciphers, enabling

plaintext recovery attacks and authentication tag forgeries, depending

on the concrete AEAD.

This bug impacts applications that use hpke-rs to encrypt a large

number of messages using the same context. Applications using the

one-shot APIs are unaffected.

Mitigation

Starting with version 0.6.0, checked_add is used to increment the

sequence number, which avoids a silent wraparound in release

mode. Additionally, the sequence number is now stored as a u64,

increasing the maximally allowed number of seal and open operations on

a given HPKE context.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. Rated impact: confidentiality high, integrity high, availability none.

CVSS metrics in full

The score comes from this vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Attack requirements: None — no deployment-specific condition has to hold.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: None — nobody has to be tricked into anything.
  • Confidentiality impact: High — total loss, or loss the attacker controls.
  • Integrity impact: High — total loss, or loss the attacker controls.
  • Availability impact: None.

Affected software

RUSTSEC-2026-0071 is recorded against 1 package.

  • hpke-rs

Timeline and source

Published on 5 February 2026 and last revised on 24 March 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

crates.io (Package)
rustsec.org (Advisory)
github.com (Web)

Other advisories for this package

hpke-rs has other advisories on record. If you are patching this one, these are worth checking on the same host:

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-02-05
Updated 2026-08-20
Modified 2026-03-24
Fix URL N/A

Affected Packages

Software From version Fixed in
hpke-rs — —

Similar Threats

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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